| Genus |
Order |
Reference |
Note |
Nomenclature |
| Q | |
| Quadratus | Myxiniformes | Nelson (2006) | . | ICZN |
| Quadricoccus | Rhodocyclales | Garrity et al. (2005); Tindall & Euzéby (2006) | Later homonym. Reoplaced by Quatrionicoccus. | ICNB |
| Quadricoccus | Chlorellales | Krienitz & Bock (2011) | As Oocystis-clade or Oocystaceae. | ICBN |
| Quadrigyrus | Gyracanthocephala | Amin (1985) | . | ICZN |
| Quadrimorphina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Quadrimorphinidae. | ICZN |
| Quadrisphaera | Kineosporiales | Maszenan et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Quadruhyalodiscus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Quadrulella | Arcellinida | Meisterfeld (2000) | Difflugina -- Lesquereusiidae. | ICZN |
| Quaesticula | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Qualea | Myrtales | Mabberley (2008) | Vochysiaceae. | ICBN |
| Quaqua | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Quararibea | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Quasilineus | Heteronemertea | Gibson (1995) | . | ICZN |
| Quasillagilis | Haptorida | Lynn (2008) | . | ICZN |
| Quasillina | Hadromerida | Boury-Esnault (2002) | . | ICZN |
| Quasipaa | Anura | Vitt & Caldwell (2009) | Dicroglossidae. | ICZN |
| Quasitetrastemma | Eumonostilifera | Chernyshev (2004); Kajihara et al. (2008) | Tetrastemmatidae. Now checking. | ICZN |
| Quasiutolineides | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Quassia | Sapindales | Mabberley (2008) | Simaroubaceae. | ICBN |
| Quaternariella | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Quaternella | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Quatrionicoccus | Rhodocyclales | Tindall & Euzéby (2006) | Replacement name for Quadricoccus. | ICNB |
| Quechualia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Quedenfeldtia | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Queenslandiella | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Quekettia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Quelchia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Quelea | Passeriformes | Clements (2007) | . | ICZN |
| Quequenia | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Quercus | Fagales | Mabberley (2008) | Fagaceae. | ICBN |
| Querula | Passeriformes | Clements (2007) | . | ICZN |
| Quesnelia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Quetzalia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Quezeliantha | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Quiabentia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Quiina | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Quillaja | Fabales | Mabberley (2008) | Quillajaceae. | ICBN |
| Quinchamalium | Santalales | Mabberley (2008) | Schoepfiaceae. | ICBN |
| Quincula | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Quinella | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Quinetia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Quinquecuspis | Peridiniales | Fensome et al. (1993) | Holocene. | ICBN |
| Quinqueloculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Quinqueremulus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Quintinia | Paracryphiales | Mabberley (2008) | Paracryphiaceae. | ICBN |
| Quiotania | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Quiscalus | Passeriformes | Clements (2007) | . | ICZN |
| Quisqueya | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Quivisianthe | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Quoyianemertes | Eumonostilifera | Chernyshev (2005); Kajihara et al. (2008) | Tetrastemmatidae. | ICZN |
| R | |
| Raabella | Rhynchodida | Lynn (2008) | . | ICZN |
| Raabellocineta | Thigmotrichida | Lynn (2008) | . | ICZN |
| Raabena | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Rabdiaster | | Yabuki et al. (2012) | Domain Eucarya - Phylum Heliozoa - Class Centrohelea. | ICZN |
| Rabdion | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rabdiophrys | | Patterson et al. (2000); Yabuki et al. (2012) | Domain Eucarya - Phylum Heliozoa - Class Centrohelea, but possibly Nucleariida (Kingdom Fungi - Incertae sedis; Patterson et al., 2000). | ICZN |
| Rabiea | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Racekiela | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Racelopodopsis | Polytrichales | Goffinet et al. (2009) | . | ICBN |
| Racelopus | Polytrichales | Goffinet et al. (2009) | . | ICBN |
| Racemobambos | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rachelia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Racinaea | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Racodiscula | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Theonellidae. | ICZN |
| Racomitrium | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Racopilum | Hypnodendrales | Goffinet et al. (2009) | . | ICBN |
| Racovitzaiella | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Litostomatea - Subclass Haptoria. | ICZN |
| Radaisia | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Radamaea | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Raddia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Raddiella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Radermachera | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Radiathamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Radicilingua | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Radicipes | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Radicula | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Astrorhizidae. | ICZN |
| Radiella | Hadromerida | Boury-Esnault (2002) | . | ICZN |
| Radinosiphon | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Radiocystis | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Radiofilum | Chlorellales | Neustupa et al. (2011) | . | ICBN |
| Radiogrammitis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Radiola | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Radiophrya | Astomatida | Lynn (2008) | . | ICZN |
| Radiophryoides | Astomatida | Lynn (2008) | . | ICZN |
| Radiophryopsis | Astomatida | Lynn (2008) | . | ICZN |
| Radiosphaerella | Mischococcales | Ettl (1978); Silva (1979) | Later synonym of Actinellipsoidion. | ICBN |
| Radiospongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Radiovittaria | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Radiozoum | | Fensome et al. (1993) | Domain Eucarya - Phylum Dinozoa - Superclass Dinokaryota. | ICBN |
| Radlkofera | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Radlkoferotoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Radula | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Radulina | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Radyera | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Rafetus | Testudinata | Vitt & Caldwell (2009) | Trionychidae. | ICZN |
| Raffenaldia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rafflesia | Malpighiales | Mabberley (2008) | Rafflesiaceae. | ICBN |
| Rafinesquia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rafnia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Ragactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Rahnella | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Rahowardiana | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Raiarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Raillardella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Raineriophrys | Pterocystida | Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Pterocystidae. Yabuki et al. (2012) spelled "Rainierophrys". | ICZN |
| Rainiera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Raja | Rajiformes | Nelson (2006) | . | ICZN |
| Rajella | Rajiformes | Nelson (2006) | . | ICZN |
| Rallina | Gruiformes | Clements (2007) | . | ICZN |
| Rallus | Gruiformes | Clements (2007) | . | ICZN |
| Ralpharia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Ralstonia | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Ramacrinella | Ichthyophonida | Kirk et al. (2008) | Eccrinales in mycology. | ICZN |
| Ramajendas | Parachela | Kinchin (1994) | . | ICZN |
| Ramanella | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Ramazzottius | Parachela | Kinchin (1994) | . | ICZN |
| Ramicephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Ramicrusta | Peyssonneliales | Schneider & Wynne (2007); Wynne & Schneider (2010) | . | ICBN |
| Ramirezella | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Ramirezia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Ramisia | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Ramlibacter | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Ramonda | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Ramorinoa | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Ramosia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Ramosmania | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ramphastos | Piciformes | Clements (2007) | . | ICZN |
| Ramphocaenus | Passeriformes | Clements (2007) | . | ICZN |
| Ramphocelus | Passeriformes | Clements (2007) | . | ICZN |
| Ramphocinclus | Passeriformes | Clements (2007) | . | ICZN |
| Ramphocoris | Passeriformes | Clements (2007) | . | ICZN |
| Ramphodon | Apodiformes | Clements (2007) | . | ICZN |
| Ramphogordius | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Ramphomicron | Apodiformes | Clements (2007) | . | ICZN |
| Ramphotrigon | Passeriformes | Clements (2007) | . | ICZN |
| Ramphotyphlops | Squamata | Vitt & Caldwell (2009) | Serpentes. Typhlopidae. | ICZN |
| Ramsayornis | Passeriformes | Clements (2007) | . | ICZN |
| Ramulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Polymorphinidae. | ICZN |
| Rana | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Ranalisma | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Ranavalona | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Randia | Passeriformes | Clements (2007) | . | ICZN |
| Randia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Randonia | Brassicales | Mabberley (2008) | Resedaceae. | ICBN |
| Rangaeris | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rangifer | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Ranitomeya | Anura | Vitt & Caldwell (2009) | Dendrobatidae. | ICZN |
| Rankinia | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Ranodon | Caudata | Vitt & Caldwell (2009) | Hynobiidae. | ICZN |
| Ranopisoa | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Ransonia | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Ranunculus | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Ranzania | Ranunculales | Mabberley (2008) | Berberidaceae. | ICBN |
| Raorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Raosentis | Gyracanthocephala | Amin (1985) | . | ICZN |
| Raoulia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Raouliopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Raoultella | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Rapatea | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Raphanorhyncha | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Raphanus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Raphia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Raphicerus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Raphidiella | Mischococcales | Ettl (1978) | . | ICBN |
| Raphidiocystis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Raphidiophrys | Acanthocystida | Mikrjukov et al. (2000); Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Raphidiophryidae. | ICZN |
| Raphidiopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Raphidocystis | Acanthocystida | Mikrjukov et al. (2000); Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Acanthocystidae. Yabuki et al. (2012) spelled "Raphidiocystis". | ICZN |
| Raphidonema | Prasiolales | Neustupa et al. (2009) | As Prasiola clade. | ICBN |
| Raphidophallus | Acoela | Hooge & Tyler (2005) | . | ICZN |
| Raphidosphaera | Mischococcales | Ettl (1978); Silva (1979) | Separated from Meringosphaera. | ICBN |
| Raphiocarpus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Raphionacme | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Raphistemma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rapidithrix | Cytophagales | Srisukchayakul et al. (2007); Ludwig et al. (2011) | . | ICNB |
| Rapistrum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rapona | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Raputia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Raritebe | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rarobacter | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Rasajeyna | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Raspaciona | Poecilosclerida | Hooper (2002) | . | ICZN |
| Raspailia | Poecilosclerida | Hooper (2002) | . | ICZN |
| Raspalia | Bruniales | Mabberley (2008) | Bruniaceae. | ICBN |
| Rastrimonas | Rastrimonadida | Cavalier-Smith & Chao (2004) | . | ICZN |
| Rastrognathia | Bursovaginoidea | Sørensen (2002) | . | ICZN |
| Rastrophyllum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rathayibacter | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Rathkea | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Ratibida | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rattus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ratufa | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ratugnathia | Bursovaginoidea | Sørensen (2002) | . | ICZN |
| Rauhia | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Rauhiella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rauhocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Rauia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Rauiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Raukaua | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Raulinoa | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Raulinoreitzia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rauvolfia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Ravenala | Zingiberales | Mabberley (2008) | Strelitziaceae. | ICBN |
| Ravenea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Ravenia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Raveniopsis | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Rawsonia | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Raycadenco | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rayella | Haemospororida | Perkins et al. (2000); Özdikmen (2009) | Junior homonym. Substituted by Manastirlia. | ICZN |
| Raygibsonia | Eumonostilifera | Sundberg et al. (2009) | . | ICZN |
| Rayjacksonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rayleya | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Razisea | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Reaumuria | Caryophyllales | Mabberley (2008) | Tamaricaceae. | ICBN |
| Rebecca | Pavlovales | Edvardsen et al. (2000); Jordan et al. (2004) | Pavlovaceae. | ICBN |
| Reboulia | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Rebutia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Recchia | Fabales | Mabberley (2008) | Surianaceae. | ICBN |
| Reckertia | Thaumatomonadida | Howe et al. (2011) | . | ICZN |
| Reclinomonas | Jakobida | Patterson et al. (2000) | . | ICZN |
| Recordia | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Recordoxylon | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rectispora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Rectobolivina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Rectoelphidiella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Elphidiidae. | ICZN |
| Rectolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Rectomassilina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Rectospiroloculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroloculinidae. | ICZN |
| Rectuvigerina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Recurvirostra | Charadriiformes | Clements (2007) | . | ICZN |
| Recurvoidella | Lituolida | Kaminski (2000) | Recurvoidinae. | ICZN |
| Recurvoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ammosphaeroidinidae. | ICZN |
| Redudasys | Macrodasyida | Balsamo et al. (2009) | . | ICZN |
| Redunca | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Reederochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Reedia | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Reessia | Hyphochytriales | Dick (2001); Kirk et al. (2008) | Rhizidiomycetaceae. | ICBN |
| Reevesia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Regadrella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Regelia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Regimitra | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Regina | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Registaniella | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Regmatodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Regnellidium | Salviniales | Christenhusz et al. (2011) | . | ICBN |
| Regulus | Passeriformes | Clements (2007) | . | ICZN |
| Rehdera | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Rehderodendron | Ericales | Mabberley (2008) | Styracaceae. | ICBN |
| Rehia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rehmannia | Lamiales | Mabberley (2008); Schäferhoff et al. (2010) | Closely related to Orobanchaceae. | ICBN |
| Reichardia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Reicheella | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Reichenbachanthus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Reichenbachia | Cytophagales | Garrity et al. (2005); Nedashkovskaya et al. (2005); Ludwig et al. (2011) | Later homonym. Replaced by Reichenbachiella. | ICNB |
| Reichenbachia | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Reichenbachiella | Cytophagales | Nedashkovskaya et al. (2005); Ludwig et al. (2011) | Replaced name for Reichenbachia. | ICNB |
| Reichenowella | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Spirotrichea - Subclass Hypotrichia. | ICZN |
| Reidispongia | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Phymatellidae. | ICZN |
| Reimarochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Reimersia | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Reinboldia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Reinboldiella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Reineckea | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Reinekea | Oceanospirillales | Romanenko et al. (2004) | . | ICNB |
| Reingardia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Reinhardtia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Reinwardtia | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Reinwardtiodendron | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Reinwardtipicus | Piciformes | Clements (2007) | . | ICZN |
| Reinwardtoena | Columbiformes | Clements (2007) | . | ICZN |
| Reissantia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Reissekia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Reissia | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Reithrodon | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Reithrodontomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Reitzia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Relchela | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Reldia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Relhania | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Remaneica | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Remaneicidae. | ICZN |
| Remanella | Loxodida | Lynn (2008) | . | ICZN |
| Remijia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Remirea | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Remirema | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Remiz | Passeriformes | Clements (2007) | . | ICZN |
| Remusatia | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Remya | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Remyella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Renanthera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Renantherella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Renaudarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Renauldia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rendlia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Renealmia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Renggeria | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Renibacterium | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Renilla | Pennatulacea | Williams (1995) | . | ICZN |
| Reniochalina | Halichondrida | Alvarez & Hooper (2002) | . | ICZN |
| Renispora | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Rennellia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rennera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Renouxia | Rhodogorgonales | Schneider & Wynne (2007) | . | ICBN |
| Renschia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rensonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Reophanus | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Reophax | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Repmanina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ammodiscidae. | ICZN |
| Reptataxis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Requienia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Reseda | Brassicales | Mabberley (2008) | Resedaceae. | ICBN |
| Resia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Resigella | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Resiomeria | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Resticula | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Restio | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Restrepia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Restrepiella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Restrepiopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Resultor | Pedinomonadales | Moestrup (1991); Moestrup (2000) | . | ICBN |
| Resupinammina | Trochamminida | Kaminski (2000) | Trochamminellinae, Trochamminacea. | ICZN |
| Retama | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Retanilla | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Reticoleps | Prorodontida | Foissner et al. (2008) | Colepidae. | ICZN |
| Reticulammina | Psamminida | Gooday & Tendal (2000) | . | ICZN |
| Reticularia | Liceales | Yamamoto (1998); Lado (2001) | . | ICBN |
| Reticulobotrys | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Reticulocaulis | Bonnemaisoniales | Schneider & Wynne (2007) | . | ICBN |
| Reticulofenestra | Isochrysidales | Jordan et al. (2004) | Noëlaerhabdaceae. | ICBN |
| Reticulomyxa | Athalamida | Bovee (1985); Lee et al. (2000) | . | ICZN |
| Reticulophragmium | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cyclamminidae. | ICZN |
| Reticulosphaera | Coccolithales | Edvardsen et al. (2000); Jordan et al. (2004) | Haptophyta ?. | ICBN |
| Reticulowoodruffia | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Reticulum | Astrorhizida | Kaminski (2000) | Komokiidae. | ICZN |
| Retiniphyllum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Retispatha | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Retortamonas | Retortamonadida | Brugerolle & Lee (2000) | . | ICZN |
| Retractocephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Retrophyllum | Araucariales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Retzia | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Reussella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Reussellidae. | ICZN |
| Reussia | Commelinales | Mabberley (2008) | Pontederiaceae. | ICBN |
| Reussoolina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagenidae. | ICZN |
| Reutealis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Revwattsia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Rexia | Nostocales | Casamatta et al. (2006) | . | ICBN |
| Reyesia | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Reynaudia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Reynoldsia | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Reynosia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Reyranella | Rhodospirillales | Pagnier et al. (2011) | . | ICNB |
| Rhabdadenia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhabdammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rhabdamminidae. | ICZN |
| Rhabdamminella | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Bathysiphonidae. | ICZN |
| Rhabdamoeba | Marimonadida | Howe et al. (2011) | . | ICZN |
| Rhabdastrella | Astrophorida | Uriz (2002) | . | ICZN |
| Rhabderemia | Poecilosclerida | Hooper (2002) | . | ICZN |
| Rhabdeurypon | Poecilosclerida | Hooper (2002) | . | ICZN |
| Rhabdoaskenasia | Cyclotrichiida | Lynn (2008) | . | ICZN |
| Rhabdocaulon | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rhabdochromatium | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Rhabdocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Rhabdodendron | Caryophyllales | Mabberley (2008) | Rhabdodendraceae. | ICBN |
| Rhabdoderma | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Rhabdodictyum | Aulocalycoida | Reiswig (2002) | . | ICZN |
| Rhabdodontium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhabdogloea | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Rhabdomonas | Rhabdomonadales | Leedale (1967); Leedale (2000) | . | ICBN |
| Rhabdomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhabdonella | Tintinnida | Lynn (2008) | . | ICZN |
| Rhabdonellopsis | Tintinnida | Lynn (2008) | . | ICZN |
| Rhabdonia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Rhabdoon | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Rhabdopectella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Rhabdophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhabdophrya | Exogenida | Lynn (2008) | . | ICZN |
| Rhabdopleura | Rhabdopleurida | Benito (1982) | Rhabdopleuridae. | ICZN |
| Rhabdops | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhabdornis | Passeriformes | Clements (2007) | . | ICZN |
| Rhabdosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Rhabdosella | Tintinnida | Lynn (2008) | . | ICZN |
| Rhabdosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Rhabdosphaeraceae. | ICBN |
| Rhabdospira | Rhabdomonadales | Leedale (1967); Leedale (2000) | . | ICBN |
| Rhabdospora | Piroplasmorida | Perkins et al. (2000) | . | ICZN |
| Rhabdostyla | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Rhabdothamnopsis | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rhabdothamnus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rhabdothermus | Thermales | Steinsbu et al. (2011) | . | ICNB |
| Rhabdothoracella | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Rhabdotosperma | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Rhabdoweisia | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Rhachidelus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhachidosorus | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Rhachisaurus | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Rhachitheciopsis | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Rhachithecium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Rhacocarpus | Hedwigiales | Goffinet et al. (2009) | . | ICBN |
| Rhacodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Rhacophorus | Anura | Vitt & Caldwell (2009) | Rhacophoridae. | ICZN |
| Rhacopilopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhacostoma | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Rhadinaea | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhadinophanes | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhadinopus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rhadinorhynchoides | Echinorhynchida | Amin (1985) | . | ICZN |
| Rhadinorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Rhadinothamnus | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Rhaebo | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Rhaesteria | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhagadiolus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhagadostoma | Prorodontida | Lynn (2008) | . | ICZN |
| Rhagamys | Rodentia | Musser & Carleton (2005) | Recently extinct. | ICZN |
| Rhagodia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Rhagologus | Passeriformes | Clements (2007) | . | ICZN |
| Rhagomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhammatophyllum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rhamnella | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Rhamnidium | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Rhamnochrysis | Chrysomeridales | Preisig (1995) | . | ICBN |
| Rhamnoneuron | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Rhamnophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhamnus | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Rhamphicarpa | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Rhamphidium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Rhamphiophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhamphogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhampholeon | Squamata | Vitt & Caldwell (2009) | Chamaeleonidae. | ICZN |
| Rhamphomantis | Cuculiformes | Clements (2007) | . | ICZN |
| Rhamphorhynchus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhanteriopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhanterium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhaphidhistia | Hadromerida | Hooper & Van Soest (2002) | . | ICZN |
| Rhaphidophora | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Rhaphidophyton | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Rhaphidostichum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhaphidozoum | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Rhaphidura | Apodiformes | Clements (2007) | . | ICZN |
| Rhaphidura | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rhaphiodon | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rhaphiolepis | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Rhaphiostylis | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Rhaphispermum | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Rhaphithamnus | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Rhaphoxya | Halichondrida | Van Soest et al. (2002) | . | ICZN |
| Rhapidophyllum | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Rhapis | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Rhaponticoides | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhaponticum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhaptapagis | Stauromedusae | Bouillon et al. (2006); Miranda et al. (2010) | Likely an early life stage of an unknown Staurozoa. | ICZN |
| Rhaptonema | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Rhaptopetalum | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Rhazya | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhea | Struthioniformes | Clements (2007) | . | ICZN |
| Rhegmatorhina | Passeriformes | Clements (2007) | . | ICZN |
| Rheinardia | Galliformes | Clements (2007) | . | ICZN |
| Rheinheimera | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Rheithrosciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rheobates | Anura | Vitt & Caldwell (2009) | Aromobatidae. | ICZN |
| Rheobatrachus | Anura | Vitt & Caldwell (2009) | Myobatrachidae. | ICZN |
| Rheochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rheodytes | Testudinata | Vitt & Caldwell (2009) | Chelidae. | ICZN |
| Rheomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rheopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Rhetinolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rheum | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Rhexia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Rhexophyllum | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Rhigiocarya | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Rhigiophyllum | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Rhigospira | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhigozum | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Rhina | Rajiformes | Nelson (2006) | . | ICZN |
| Rhinacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Rhinakis | Nassulida | Lynn (2008) | . | ICZN |
| Rhinanthus | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Rhinatrema | Gymnophiona | Vitt & Caldwell (2009) | Rhinatrematidae. | ICZN |
| Rhincodon | Orectolobiformes | Nelson (2006) | . | ICZN |
| Rhinella | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Rhinemys | Testudinata | Vitt & Caldwell (2009) | Chelidae. | ICZN |
| Rhinephyllum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Rhinerrhiza | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhineura | Squamata | Vitt & Caldwell (2009) | Rhineuridae. | ICZN |
| Rhinobatos | Rajiformes | Nelson (2006) | . | ICZN |
| Rhinobothryum | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhinoceros | Perissodactyla | McKenna & Bell (1997) | . | ICZN |
| Rhinocheilus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhinochimaera | Chimaeriformes | Nelson (2006) | . | ICZN |
| Rhinoclemmys | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Rhinocrypta | Passeriformes | Clements (2007) | . | ICZN |
| Rhinoderma | Anura | Vitt & Caldwell (2009) | Cycloramphidae. | ICZN |
| Rhinodinium | Peridiniales | Murray et al. (2006) | . | ICBN |
| Rhinodisculus | Philasterida | Lynn (2008) | . | ICZN |
| Rhinoglena | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Rhinoleptus | Squamata | Vitt & Caldwell (2009) | Serpentes. Leptotyphlopidae. | ICZN |
| Rhinolophus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Rhinomonas | Pyrenomonadales | Clay et al. (1999); Novarino (2003) | . | ICBN |
| Rhinomyias | Passeriformes | Clements (2007) | . | ICZN |
| Rhinonicteris | Chiroptera | Simmons (2005) | Original spelling of Rhinonycteris. | ICZN |
| Rhinonycteris | Chiroptera | McKenna & Bell (1997); Simmons (2005) | Alternative spelling of Rhinonicteris (original spelling). | ICZN |
| Rhinophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Uropeltidae. | ICZN |
| Rhinophrynus | Anura | Vitt & Caldwell (2009) | Rhinophrynidae. | ICZN |
| Rhinophylla | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Rhinopithecus | Primates | Groves (2005) | . | ICZN |
| Rhinoplocephalus | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Rhinopoma | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Rhinopomastus | Coraciiformes | Clements (2007) | . | ICZN |
| Rhinoptera | Myliobatiformes | Nelson (2006) | . | ICZN |
| Rhinoptilus | Charadriiformes | Clements (2007) | . | ICZN |
| Rhinoraja | Rajiformes | Nelson (2006) | . | ICZN |
| Rhinosciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhinosporidium | Dermocystida | Mendoza et al. (2002) | . | ICZN |
| Rhinothrix | Haptorida | Lynn (2008) | . | ICZN |
| Rhinotyphlops | Squamata | Vitt & Caldwell (2009) | Serpentes. Typhlopidae. | ICZN |
| Rhinozeta | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Rhipidantha | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rhipidium | Rhipidiales | Dick (2001); Kirk et al. (2008) | Rhipidiaceae. | ICBN |
| Rhipidocladum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rhipidodendron | Spongomonadida | Cavalier-Smith (2000); Cavalier-Smith & Chao (2003) | . | ICZN |
| Rhipidomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhipidopathes | Antipatharia | Opresko (2004) | . | ICZN |
| Rhipidothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhipidura | Passeriformes | Clements (2007) | . | ICZN |
| Rhipogonum | Liliales | Farr et al. (1979); Greuter et al. (1993); Mabberley (2008) | Orthographic variant of "Ripogonum". | ICBN |
| Rhipsalis | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Rhizammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rhabdamminidae. | ICZN |
| Rhizamoeba | Leptomyxida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Rhizanthella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhizanthes | Malpighiales | Mabberley (2008) | Rafflesiaceae. | ICBN |
| Rhizaspis | | Leedale (1967) | Domain Eucarya - Phylum Euglenozoa - Class Euglenophyceae. | ICBN |
| Rhizaspis | Cryomonadida | Howe et al. (2011) | . | ICZN |
| Rhizaster | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Rhizaxinella | Hadromerida | Van Soest (2002) | . | ICZN |
| Rhizellobiopsis | Thalassomycetales | Whisler (1990) | As ellobiopsids. | ICBN |
| Rhizidiomyces | Hyphochytriales | Dick (2001); Kirk et al. (2008) | Rhizidiomycetaceae. | ICBN |
| Rhizionella | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Rhizobacter | Burkholderiales | Garrity et al. (2005); Stackebrandt et al. (2009) | . | ICNB |
| Rhizobium | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Rhizobotrya | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rhizobranchium | Endogenida | Lynn (2008) | . | ICZN |
| Rhizocaryum | Astomatida | Lynn (2008) | . | ICZN |
| Rhizocaulus | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Rhizocephalus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rhizochloris | Rhizochloridales | Ettl (1978) | . | ICBN |
| Rhizochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Rhizochromulina | Rhizochromulinales | Sekiguchi et al. (2003); Edvardsen et al. (2007) | . | ICBN |
| Rhizodinium | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Rhizodomus | Tintinnida | Lynn (2008) | . | ICZN |
| Rhizofabronia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhizogeton | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Rhizogonium | Rhizogoniales | Goffinet et al. (2009) | . | ICBN |
| Rhizohypnella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhizolamiella | Corallinales | Wynne & Schneider (2010) | . | ICBN |
| Rhizolekane | Rhizochloridales | Ettl (1978) | . | ICBN |
| Rhizomastix | Pelobiontida | Cepicka (2011) | The affiliation is provisional. | ICZN |
| Rhizomicrobium | | Ueki et al. (2010) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. | ICNB |
| Rhizomnium | Bryales | Goffinet et al. (2009) | . | ICBN |
| Rhizomolgula | Stolidobranchia | Monniot & Monniot (1972) | Molgulidae. | ICZN |
| Rhizomonas | Sphingomonadales | Garrity et al. (2005) | . | ICNB |
| Rhizomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhizonympha | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Rhizoochromonas | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (biflagellate). | ICBN |
| Rhizophora | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Rhizophyllis | Gigartinales | Schneider & Wynne (2007) | Later synonym of Contarinia. | ICBN |
| Rhizophysa | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Rhizoplagiodontia | Rodentia | Woods & Kilpatrick (2005) | Recently extinct. | ICZN |
| Rhizoplasma | | Bass et al. (2009) | Domain Eucarya - Rhizaria - incertae sedis - Family Rhizoplasmidae. | ICZN |
| Rhizopogonia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Rhizoprionodon | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Rhizopsammia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Rhizorhagium | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Rhizosmilia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Rhizostoma | Rhizostomeae | Kramp (1961) | . | ICZN |
| Rhizothera | Galliformes | Clements (2007) | . | ICZN |
| Rhizotricha | Vestibuliferida | Lynn (2008) | . | ICZN |
| Rhizotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Rhodachlya | Rhodachlyales | West et al. (2008) | . | ICBN |
| Rhodactis | Corallimorpharia | Fautin et al. (2007) | . | ICZN |
| Rhodalia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Rhodamnia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Rhodanobacter | Xanthomonadales | Garrity et al. (2005) | . | ICNB |
| Rhodanthe | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhodanthemum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhodaphanes | Stylonematales | Schneider & Wynne (2007) | . | ICBN |
| Rhodelinda | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Rhodella | Rhodellales | Schneider & Wynne (2007); Yokoyama et al. (2009) | . | ICBN |
| Rhodinocichla | Passeriformes | Clements (2007) | . | ICZN |
| Rhodobaca | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rhodobacter | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rhodobium | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Rhodoblastus | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Rhodobryum | Bryales | Goffinet et al. (2009) | . | ICBN |
| Rhodocallis | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodochaete | Rhodochaetales | Schneider & Wynne (2007) | . | ICBN |
| Rhodochiton | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Rhodochorton | Acrochaetiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodochortonopsis | Acrochaetiales | Schneider & Wynne (2007); Wynne & Schneider (2010) | Later synonym of Acrochaetium. | ICBN |
| Rhodocista | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Rhodococcus | Corynebacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Rhodocolea | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Rhodocoma | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Rhodocyclus | Rhodocyclales | Garrity et al. (2005) | . | ICNB |
| Rhodocytophaga | Cytophagales | Anandham et al. (2010); Ludwig et al. (2011) | . | ICNB |
| Rhododendron | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Rhododictyon | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhododiscus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Rhododon | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rhododraparnaldia | Balbianiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodoferax | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Rhodoglobus | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Rhodoglossum | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Rhodogorgon | Rhodogorgonales | Schneider & Wynne (2007) | . | ICBN |
| Rhodohypoxis | Asparagales | Mabberley (2008) | Hypoxidaceae. | ICBN |
| Rhodokrambe | Ceramiales | Wynne & Schneider (2010) | Later synonym of Erythroglossum. | ICBN |
| Rhodolachne | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodolaena | Malvales | Mabberley (2008) | Sarcolaenaceae. | ICBN |
| Rhodoleia | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Rhodoligotrophos | Rhizobiales | Fukuda et al. (2012) | . | ICNB |
| Rhodomela | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodomelopsis | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodomicrobium | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Rhodomonas | Pyrenomonadales | Clay et al. (1999) | . | ICBN |
| Rhodomyrtus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Rhodonellum | Cytophagales | Schmidt et al. (2006); Ludwig et al. (2011) | . | ICNB |
| Rhodonematella | Palmariales | Wynne & Schneider (2010) | . | ICBN |
| Rhodopechys | Passeriformes | Clements (2007) | . | ICZN |
| Rhodopeltis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Rhodophiala | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Rhodophoneus | Passeriformes | Clements (2007) | . | ICZN |
| Rhodophyllis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Rhodophysema | Palmariales | Schneider & Wynne (2007) | . | ICBN |
| Rhodophysemopsis | Palmariales | Schneider & Wynne (2007) | . | ICBN |
| Rhodopila | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Rhodopirellula | Planctomycetales | Schlesner et al. (2004) | . | ICNB |
| Rhodopis | Apodiformes | Clements (2007) | . | ICZN |
| Rhodopis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rhodoplanes | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Rhodopseudomonas | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Rhodoptilum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rhodosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Rhodosoma | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Corellidae. | ICZN |
| Rhodosorus | Stylonematales | Schneider & Wynne (2007) | . | ICBN |
| Rhodospatha | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Rhodosphaera | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Rhodospingus | Passeriformes | Clements (2007) | . | ICZN |
| Rhodospira | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Rhodospirillum | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Rhodospiza | Passeriformes | Clements (2007) | . | ICZN |
| Rhodospora | Stylonematales | Schneider & Wynne (2007) | . | ICBN |
| Rhodostemonodaphne | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Rhodostethia | Charadriiformes | Clements (2007) | . | ICZN |
| Rhodostichus | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Rhodothalassium | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rhodothamniella | Palmariales | Schneider & Wynne (2007) | . | ICBN |
| Rhodothamnus | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Rhodothermus | | Garrity et al. (2005); Ludwig et al. (2011) | Domain Bacteria - Phylum Bacteroidetes - Class Cytophagia. | ICNB |
| Rhodothraupis | Passeriformes | Clements (2007) | . | ICZN |
| Rhodothyrsus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Rhodotypos | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Rhodovarius | Rhodospirillales | Kämpfer et al. (2004) | . | ICNB |
| Rhodovibrio | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Rhodovulum | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rhodymenia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Rhodymeniocolax | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Rhogeessa | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Rhogostoma | Cryomonadida | Meisterfeld (2000); Cavalier-Smith & Chao (2003); Howe et al. (2011) | . | ICZN |
| Rhoiacarpos | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Rhoicissus | Vitales | Mabberley (2008) | Vitaceae. | ICBN |
| Rhoiptelea | Fagales | Mabberley (2008) | Rhoipteleaceae. | ICBN |
| Rhomballichthys | Chaetonotida | Balsamo et al. (2009) | . | ICZN |
| Rhombifera | Aplousobranchia | Monniot (2001) | Polycitoridae. | ICZN |
| Rhomboarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Rhombochlamys | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Rhomboda | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhomboidella | Mischococcales | Ettl (1978) | . | ICBN |
| Rhombolytrum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rhombomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhombophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Rhombophyllum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Rhombopsammia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Rhoogeton | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rhopalaea | Aplousobranchia | Monniot & Monniot (1972); Kott (1998); Monniot (2001) | Diazonidae. | ICZN |
| Rhopalephora | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Rhopaloblaste | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Rhopalobrachium | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rhopalocarpus | Malvales | Mabberley (2008) | Sphaerosepalaceae. | ICBN |
| Rhopalocnemis | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Rhopaloeides | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Rhopalonema | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Rhopalonia | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Rhopalophrya | Haptorida | Lynn (2008) | . | ICZN |
| Rhopalopilia | Santalales | Mabberley (2008) | Opiliaceae. | ICBN |
| Rhopalopsis | Phlebobranchia | Monniot & Monniot (1972); Kott (1998) | Junior synonym of Rhopalaea. | ICZN |
| Rhopalostylis | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Rhopalura | Orthonectida | Stunkard (1982); Kozloff (1992) | . | ICZN |
| Rhopilema | Rhizostomeae | Kramp (1961) | . | ICZN |
| Rhopocichla | Passeriformes | Clements (2007) | . | ICZN |
| Rhopophilus | Passeriformes | Clements (2007) | . | ICZN |
| Rhopornis | Passeriformes | Clements (2007) | . | ICZN |
| Rhoptropus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Rhuacophila | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Rhumblerella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Globotextulariidae. | ICZN |
| Rhumbleriella | | Meisterfeld (2000); Cavalier-Smith & Chao (2003) | Domain Eucarya - Phylum Cercozoa. | ICZN |
| Rhumblerinella | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagynidae. | ICZN |
| Rhus | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Rhyacornis | Passeriformes | Clements (2007) | . | ICZN |
| Rhyacotriton | Caudata | Vitt & Caldwell (2009) | Rhyacotritonidae. | ICZN |
| Rhynchanthera | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Rhynchanthus | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Rhyncharrhena | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhyncheta | Endogenida | Lynn (2008) | . | ICZN |
| Rhynchobatus | Rajiformes | Nelson (2006) | . | ICZN |
| Rhynchobodo | Neobodonida | Moreira et al. (2004) | . | ICZN |
| Rhynchocalamus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhynchocalyx | Myrtales | Mabberley (2008) | Crypteroniaceae. | ICBN |
| Rhynchocladium | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Rhynchocoma | Hypocomatida | Lynn (2008) | . | ICZN |
| Rhynchocorys | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Rhynchocyclus | Passeriformes | Clements (2007) | . | ICZN |
| Rhynchocyon | Macroscelidea | McKenna & Bell (1997) | . | ICZN |
| Rhynchocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Rhynchodinium | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Rhynchoedura | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Rhynchogale | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Rhynchoglossum | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rhynchogromia | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Rhynchogyna | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhynchoidomonas | Trypanosomatida | Moreira et al. (2004) | . | ICZN |
| Rhyncholacis | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Rhyncholaelia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhyncholestes | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Rhynchomeles | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Rhynchomonas | Neobodonida | Moreira et al. (2004) | . | ICZN |
| Rhynchomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rhynchonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Rhynchonympha | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Rhynchophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Rhynchophora | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Rhynchophreatia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhynchophrya | Evaginogenida | Lynn (2008) | . | ICZN |
| Rhynchopsidium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhynchopsitta | Psittaciformes | Clements (2007) | . | ICZN |
| Rhynchopus | | Leedale (1967) | Domain Eucarya - Phylum Euglenozoa - Class Euglenophyceae. | ICBN |
| Rhynchopus | Diplonemida | Cavalier-Smith (2003) | . | ICZN |
| Rhynchortyx | Galliformes | Clements (2007) | . | ICZN |
| Rhynchorza | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rhynchosaccus | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Rhynchosia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rhynchosida | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Rhynchospermum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhynchospora | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Rhynchostegiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhynchostegiopsis | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Rhynchostegium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhynchostele | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhynchostruthus | Passeriformes | Clements (2007) | . | ICZN |
| Rhynchostylis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rhynchotechum | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rhynchotheca | Geraniales | Mabberley (2008) | Ledocarpaceae. | ICBN |
| Rhynchotropis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rhynchotus | Tinamiformes | Clements (2007) | . | ICZN |
| Rhynochetos | Gruiformes | Clements (2007) | . | ICZN |
| Rhyposophrya | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Colpodea. | ICZN |
| Rhysia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Rhysolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rhysopterus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Rhysotoechia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Rhyssolobium | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhyssostelma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhytachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rhyticaryum | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Rhytidanthera | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Rhytidiadelphus | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhytidiopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhytidium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rhytidocaulon | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Rhytidocystis | Agamococcidiorida | Perkins et al. (2000) | . | ICZN |
| Rhytidophyllum | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rhytipterna | Passeriformes | Clements (2007) | . | ICZN |
| Rhytisma | Alcyonacea | Alderslade (2000) | Alcyoniidae. | ICZN |
| Riama | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Ribes | Saxifragales | Mabberley (2008) | Grossulariaceae. | ICBN |
| Riboscyphidia | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Riccardia | Metzgeriales | Crandall-Stotler et al. (2009) | . | ICBN |
| Riccia | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Ricciocarpos | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Richardia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Richardsiella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Richea | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Richelia | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Richella | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Richeria | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Richeriella | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Richterago | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Richteria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Richtersius | Parachela | Kinchin (1994) | . | ICZN |
| Ricinocarpos | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Ricinodendron | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Ricinus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Rickettsia | Rickettsiales | Garrity et al. (2005) | . | ICNB |
| Rickettsiella | Legionellales | Garrity et al. (2005) | . | ICNB |
| Ricordea | Corallimorpharia | Fautin et al. (2007) | . | ICZN |
| Ricotia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rictus | | Yubuki et al. (2010) | Domain Eucarya - Kingdom Straminipila - Phylum Bicosoecacea - Class Bicoecea. | ICZN |
| Ridgwayia | Passeriformes | Clements (2007) | . | ICZN |
| Ridleia | Hadromerida | Boury-Esnault (2002) | . | ICZN |
| Ridleyandra | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Ridleyella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ridolfia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Riedelia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Riedeliella | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Riella | Sphaerocarpales | Crandall-Stotler et al. (2009) | . | ICBN |
| Riemerella | Flavobacteriales | Garrity et al. (2005) | . | ICNB |
| Riencourtia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rieppeleon | Squamata | Tilbury & Tolley (2009) | Chamaeleonidae. | ICZN |
| Riftus | Endogenida | Lynn (2008) | . | ICZN |
| Rigchostoma | Colpodida | Lynn (2008) | . | ICZN |
| Rigidicortex | Sporadotrichida | Lynn (2008) | . | ICZN |
| Rigidothrix | Sporadotrichida | Lynn (2008) | . | ICZN |
| Rigiopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rigodiadelphus | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rigodium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Riisea | Alcyonacea | Bayer (1981); Bayer & Grasshoff (1994) | Ellisellidae. | ICZN |
| Rikenella | Bacteroidales | Garrity et al. (2005) | . | ICNB |
| Rimacola | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rimaleptus | Haptorida | Lynn (2008) | . | ICZN |
| Rimator | Passeriformes | Clements (2007) | . | ICZN |
| Rimella | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Phymaraphiniidae. | ICZN |
| Rimicola | Acoela | Dörjes (1968); Hooge & Tyler (2005) | . | ICZN |
| Rimostrombidium | Choreotrichida | Lynn (2008) | . | ICZN |
| Rimulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nodosariidae. | ICZN |
| Rimulinoides | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagenidae. | ICZN |
| Rindera | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Ringueletium | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Rinorea | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Rinoreocarpus | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Rinzia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Riocreuxia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Riodocea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Riolama | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Riopa | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Rioraja | Rajiformes | Nelson (2006) | . | ICZN |
| Ripacubana | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rhapydioninidae. | ICZN |
| Riparia | Passeriformes | Clements (2007) | . | ICZN |
| Ripella | Vannellida | Smirnov et al. (2011) | . | ICZN |
| Ripidomyxa | Leptomyxida | Chakraborty & Pussard (1985); Tekle et al. (2008) | . | ICZN |
| Ripogonum | Liliales | Farr et al. (1979); Greuter et al. (1993); Mabberley (2008) | Ripogonaceae. Not "Rhipogonum" (Farr et al., 1979; Mabberley, 2008), but the orthographic variant "Rhipogonum" is frequently used (Greuter et al., 1993). | ICBN |
| Riquetophycus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Riqueuria | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Riseriellus | Heteronemertea | Gibson (1995) | . | ICZN |
| Riserius | Heteronemertea | Gibson (1995); Chernyshev (1995); Thollesson & Norenburg (2003); Kajihara et al. (2008) | . | ICZN |
| Risleya | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rissa | Charadriiformes | Clements (2007) | . | ICZN |
| Rissoella | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Ristantia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Ristella | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Ritchiea | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Ritonia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Ritterella | Aplousobranchia | Monniot & Monniot (1972); Kott (1998); Monniot (2001) | Ritterellidae. | ICZN |
| Ritteria | Helminthomorpha | Deland et al. (2010) | Harrimaniidae. | ICZN |
| Ritteriella | Salpida | Godeaux (1998) | . | ICZN |
| Riveroina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Riveroinidae. | ICZN |
| Rivibacter | Burkholderiales | Stackebrandt et al. (2009) | . | ICNB |
| Rivina | Caryophyllales | Mabberley (2008) | Phytolaccaceae. | ICBN |
| Rivularia | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Robbairea | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Robbrechtia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Robea | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Robertina | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Robertinidae. | ICZN |
| Robertinoides | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Robertinidae. | ICZN |
| Robeschia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Robiginitalea | Flavobacteriales | Cho & Giovannoni (2004) | . | ICNB |
| Robiginitomaculum | | Lee et al. (2007); Williams et al. (2007) | Domain Bacteria - Phylum Proteobacteria - Class Alphaproteobacteria. Hyphomonadaceae. | ICNB |
| Robinia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Robinsonecio | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Robinsonella | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Robinsonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Robinsoniella | Clostridiales | Cotta et al. (2009) | . | ICNB |
| Robiquetia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Robsonodendron | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Robynsia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Robynsiophyton | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rochefortia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Rochelia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Rochonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rockinghamia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Rodgersia | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Rodriguezella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rodriguezia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rodrigueziella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rodrigueziopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Roella | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Roellia | Bryales | Goffinet et al. (2009) | . | ICBN |
| Roemeria | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Roepera | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Roeperocharis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rogeria | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Rogersonanthus | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Rohdea | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Roigella | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Roivainenia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Rojasianthe | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rojasimalva | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Rolandra | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Roldana | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rollandia | Podicipediformes | Clements (2007) | . | ICZN |
| Rollinia | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Rollinsia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rollulus | Galliformes | Clements (2007) | . | ICZN |
| Romanoa | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Romanschulzia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Romanzoffia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Romeria | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Romeroa | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Romerolagus | Lagomorpha | McKenna & Bell (1997) | . | ICZN |
| Romnalda | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Romneya | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Romulea | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Rondacineta | Endogenida | Lynn (2008) | . | ICZN |
| Rondeletia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rondonanthus | Poales | Mabberley (2008) | Eriocaulaceae. | ICBN |
| Rondosomides | Exogenida | Lynn (2008) | . | ICZN |
| Ronnbergia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Roodebergia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Roombia | Kathablepharidida | Okamoto et al. (2009) | . | ICZN |
| Ropostrum | Lituolida | Kaminski (2000) | Telamminidae. | ICZN |
| Roraimia | Passeriformes | Clements (2007) | . | ICZN |
| Roridula | Ericales | Mabberley (2008) | Roridulaceae. | ICBN |
| Rorippa | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rosa | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Rosacea | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Rosalina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rosalinidae. | ICZN |
| Rosalinda | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Roscheria | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Roscoea | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Roscoffia | Peridiniales | Fensome et al. (1993); Greuter et al. (1993); Horiguchi & Kubo (1997) | Not "Rosscoffia". | ICBN |
| Rosculus | Schizopyrenida | Patterson et al. (2000) | . | ICZN |
| Rosea | Apostomatida | Lynn (2008) | Nomen dubium. | ICZN |
| Roseateles | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Roseburia | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Roseibaca | Rhodobacterales | Labrenz et al. (2009) | . | ICNB |
| Roseibacillus | Verrucomicrobiales | Yoon et al. (2008) | . | ICNB |
| Roseibacterium | Rhodobacterales | Suzuki et al. (2006) | . | ICNB |
| Roseibium | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Roseicitreum | Rhodobacterales | Yu et al. (2011) | . | ICNB |
| Roseicyclus | Rhodobacterales | Rathgeber et al. (2005) | . | ICNB |
| Roseiflexus | Chloroflexales | Garrity et al. (2005) | . | ICNB |
| Roseinatronobacter | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Roseisalinus | Rhodobacterales | Labrenz et al. (2005) | . | ICNB |
| Roseivirga | Cytophagales | Nedashkovskaya et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Roseivivax | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rosenbergiodendron | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rosenia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rosenvingiella | Prasiolales | Rindi et al. (2007) | . | ICBN |
| Roseobacter | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Roseococcus | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Roseodendron | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Roseomonas | Rhodospirillales | Garrity et al. (2005); Reddy et al. (2006) | . | ICNB |
| Roseospira | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Roseospirillum | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Roseovarius | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rosgorgia | Alcyonacea | López-Gonz´lez & Gili (2001) | Subergorgiidae. | ICZN |
| Rosifax | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Rosmarinus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rosselia | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Rossella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Rossioglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Rossonophrys | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Rostkovia | Poales | Mabberley (2008) | Juncaceae. | ICBN |
| Rostraria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rostratula | Charadriiformes | Clements (2007) | . | ICZN |
| Rostrhamus | Falconiformes | Clements (2007) | . | ICZN |
| Rostronympha | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Rostrophrya | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Rostrophryides | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Rostroraja | Rajiformes | Nelson (2006) | . | ICZN |
| Rosulabryum | Bryales | Goffinet et al. (2009) | . | ICBN |
| Rosularia | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Rotala | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Rotaliammina | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Trochamminidae. | ICZN |
| Rotalidium | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rotaliidae. | ICZN |
| Rotaliella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rotaliellidae. | ICZN |
| Rotalinoides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rotaliidae. | ICZN |
| Rotaria | Bdelloida | Segers (2002); Segers (2007) | . | ICZN |
| Rotheca | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rothia | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Rothia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rothmaleria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rothmannia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rotorboides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rosalinidae. | ICZN |
| Rottboellia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rotuloplocamia | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Rotundocylis | Tintinnida | Lynn (2008) | nomen nudum. | ICZN |
| Rotundula | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Roucheria | Malpighiales | Mabberley (2008) | Linaceae. | ICBN |
| Rougetius | Gruiformes | Clements (2007) | . | ICZN |
| Roupala | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Rourea | Oxalidales | Mabberley (2008) | Connaraceae. | ICBN |
| Rousettus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Roussea | Asterales | Mabberley (2008) | Rousseaceae. | ICBN |
| Rousseauxia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Rousseletia | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Rousselia | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Rouya | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Rovinjella | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Rowettia | Passeriformes | Clements (2007) | . | ICZN |
| Roxasia | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Roya | Zygnematales | Gontcharov (2008) | . | ICBN |
| Roycea | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Roylea | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Roystonea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Rozea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Rozellopsis | Rozellopsidales | Dick (2001); Kirk et al. (2008) | Rozellopsidaceae. | ICBN |
| Ruagea | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Ruakituria | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Globotextulariidae. | ICZN |
| Ruania | Micrococcales | Gu et al. (2007); Ludwig et al. (2012) | . | ICNB |
| Rubellimicrobium | Rhodobacterales | Denner et al. (2006) | . | ICNB |
| Rubia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rubidibacter | Chroococcales | Choi et al. (2008) | Originally described under ICNB. | ICBN |
| Rubiteucris | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Rubovietnamia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rubratella | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ceratobuliminidae. | ICZN |
| Rubribacterium | Rhodobacterales | Boldareva et al. (2009) | . | ICNB |
| Rubricoccus | | Park et al. (2011) | Domain Bacteria - Phylum Bacteroidetes - Class Cytophagia. | ICNB |
| Rubrimonas | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Rubrioxytricha | Sporadotrichida | Lynn (2008) | . | ICZN |
| Rubrisciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Rubritalea | Verrucomicrobiales | Scheuermayer et al. (2006) | . | ICNB |
| Rubritepida | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Rubrivivax | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Rubrobacter | Rubrobacterales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Rubrointrusa | Palmariales | Wynne & Schneider (2010) | . | ICBN |
| Rubus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Rucervus | Artiodactyla | Grubb (2005) | . | ICZN |
| Rudaea | Xanthomonadales | Weon et al. (2009) | . | ICNB |
| Rudanella | Cytophagales | Weon et al. (2008); Ludwig et al. (2011) | . | ICNB |
| Rudbeckia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rudgea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rudigaudryina | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Eggerellidae. | ICZN |
| Rudjakovia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Rudolfiella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ruegeria | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Ruellia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Ruelliopsis | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Rufodorsia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Rufusia | Rufusiales | Schneider & Wynne (2007); Zuccarello et al. (2008) | . | ICBN |
| Rufusiella | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Rugaecaulis | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Rugamonas | Pseudomonadales | Garrity et al. (2005) | . | ICNB |
| Rugelia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rugidia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Bagginidae. | ICZN |
| Rugiloricus | Nanaloricida | Heiner & Kristensen (2009) | . | ICZN |
| Rugosimonospora | Micromonosporales | Monciardini et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Ruhbergia | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Ruizanthus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Ruizia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Ruizodendron | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Ruizterania | Myrtales | Mabberley (2008) | Vochysiaceae. | ICBN |
| Rukia | Passeriformes | Clements (2007) | . | ICZN |
| Rulingia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Rumex | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Rumfordia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rumia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Ruminobacter | Aeromonadales | Garrity et al. (2005) | . | ICNB |
| Ruminococcus | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Rummeliibacillus | Bacillales | Vaishampayan et al. (2009) | . | ICNB |
| Rumohra | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Rumphella | Alcyonacea | Bayer (1981) | Gorgoniidae. | ICZN |
| Runella | Cytophagales | Garrity et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Rungia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Rungwecebus | Primates | Davenport et al. (2006) | . | ICZN |
| Rupertia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Rupertianella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Miliolidae. | ICZN |
| Rupertina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Victoriellidae. | ICZN |
| Rupicapnos | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Rupicapra | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Rupicola | Passeriformes | Clements (2007) | . | ICZN |
| Ruppia | Alismatales | Mabberley (2008) | Ruppiaceae. | ICBN |
| Ruprechtia | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Ruptiliocarpon | Celastrales | Mabberley (2008) | Lepidobotryaceae. | ICBN |
| Rusa | Artiodactyla | Grubb (2005) | . | ICZN |
| Rusbya | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Rusbyella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ruschia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Ruschianthus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Ruscus | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Ruspolia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Russelia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Russellia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Russowia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Rustia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ruta | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Rutaneblina | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Rutenbergia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Ruthalicia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Rutheopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Rutherfordoides | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Fursenkoinidae. | ICZN |
| Ruthiella | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Ruthiella | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Rutidea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rutidosis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ruttya | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Ruwenzorisorex | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Ruwenzorornis | Cuculiformes | Clements (2007) | . | ICZN |
| Ruyschia | Ericales | Mabberley (2008) | Marcgraviaceae. | ICBN |
| Ryania | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Rynchops | Charadriiformes | Clements (2007) | . | ICZN |
| Ryparosa | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Ryssopterys | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Rytidocarpus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Rytidosperma | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Rytidostylis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Rytigynia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Rytiphlaea | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Rzedowskia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| S | |
| Saaba | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Saba | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sabal | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Sabatia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Sabazia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sabia | Sabiales | Mabberley (2008) | Sabiaceae. | ICBN |
| Sabicea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sabulodinium | | Fensome et al. (1993) | Domain Eucarya - Phylum Dinozoa - Class Dinophyceae - Subclass Peridiniphycidae. | ICBN |
| Sacalia | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Saccammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Saccamminidae. | ICZN |
| Saccamminella | Astrorhizida | Kaminski (2000) | Saccammininae. | ICZN |
| Saccamoeba | Euamoebida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Saccellium | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Saccharibacillus | Bacillales | Rivas et al. (2008) | . | ICNB |
| Saccharibacter | Rhodospirillales | Jojima et al. (2004) | . | ICNB |
| Saccharobacter | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Saccharococcus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Saccharofermentans | Clostridiales | Chen et al. (2010) | . | ICNB |
| Saccharomonospora | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Saccharophagus | Alteromonadales | Ekborg et al. (2005) | . | ICNB |
| Saccharopolyspora | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Saccharospirillum | Oceanospirillales | Garrity et al. (2005) | . | ICNB |
| Saccharothrix | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Saccharum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Saccifolium | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Saccinobaculus | Oxymonadida | Brugerolle & Lee (2000) | . | ICZN |
| Sacciolepis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Saccocalyx | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Saccocalyx | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Saccochrysis | Chromulinales | Kristiansen & Preisig (2001) | Chromulinaceae (uniflagellate). | ICBN |
| Saccodendron | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Astrorhizidae. | ICZN |
| Saccoglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Saccoglossus | Helminthomorpha | Benito (1982) | Harrimaniidae. | ICZN |
| Saccogyna | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Saccogynidium | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Saccolabiopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Saccolaimus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Saccoloma | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Sacconema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Sacconemertella | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Sacconemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Sacconemertopsis | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Saccopteryx | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Saccorhiza | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hippocrepinidae. | ICZN |
| Saccosentis | Gyracanthocephala | Amin (1985) | . | ICZN |
| Saccospyris | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Saccostomus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sachalinorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Sachsia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sacleuxia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sacoglottis | Malpighiales | Mabberley (2008) | Humiriaceae. | ICBN |
| Sacoila | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sacosperma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sadiria | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Sadleria | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Saedeleeria | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Saelania | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Saepicula | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Sagamalia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Sagaminemertes | Reptantia | Gibson (1995) | . | ICZN |
| Sagartia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Sagartianthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Sagartiogeton | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Sagartiomorphe | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Sagenina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Dryorhizopsidae. | ICZN |
| Sagenoarium | Phaeosphaerida | Takahashi & Anderson (2000) | . | ICZN |
| Sagenoscena | Phaeosphaerida | Takahashi & Anderson (2000) | . | ICZN |
| Sagenotortula | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Sageraea | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Sageretia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Sagina | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Sagitta | Aphragmophora | Bieri (1991) | Sagittidae. | ICZN |
| Sagittaria | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Sagittaria | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Sagittarius | Falconiformes | Clements (2007) | . | ICZN |
| Sagittula | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Sagoscena | Phaeosphaerida | Takahashi & Anderson (2000) | . | ICZN |
| Sagotia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Sagrina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Sagrinella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Sagrinopsis | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Saguinus | Primates | McKenna & Bell (1997) | . | ICZN |
| Saharanthus | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Sahlingia | Erythropeltidales | Schneider & Wynne (2007) | . | ICBN |
| Sahulia | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Textulariidae. | ICZN |
| Saidovina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Saiga | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Saimiri | Primates | McKenna & Bell (1997) | . | ICZN |
| Sainouron | | Cavalier-Smith et al. (2008); Howe et al. (2009); Cavalier-Smith et al. (2009) | Domain Eucarya - Phylum Cercozoa. Sainouroidea; Sainouroidae. | ICZN |
| Saintclairoides | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ceratobuliminidae. | ICZN |
| Sainthelenia | Hypnales | Ignatov et al. (2008) | . | ICBN |
| Saintpaulia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Saintpauliopsis | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Saiphos | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Sairocarpus | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Saitobryum | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Sajanella | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sakesphorus | Passeriformes | Clements (2007) | . | ICZN |
| Sakoanala | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Salacca | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Salacia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Salacia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Salacighia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Salaciopsis | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Salamandra | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Salamandrella | Caudata | Vitt & Caldwell (2009) | Hynobiidae. | ICZN |
| Salamandrina | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Salana | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Salanoia | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Salarchaeum | Halobacteriales | Shimane et al. (2011) | . | ICNB |
| Salcedoa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Saldinia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Salea | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Salegentibacter | Flavobacteriales | Garrity et al. (2005); McCammon & Bowman (2000) | "Saligentibacter" in Garrity et al. (2005) is misspelling.. | ICNB |
| Salibacillus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Salicola | Oceanospirillales | Maturrano et al. (2006) | . | ICNB |
| Salicornia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Salilagenidium | Salilagenidiales | Dick (2001); Kirk et al. (2008) | Salilagenidiaceae. | ICBN |
| Salimicrobium | Bacillales | Yoon et al. (2007) | . | ICNB |
| Salinactinospora | Streptosporangiales | Chang et al. (2012); Ludwig et al. (2012) | Nocardiopsaceae. | ICNB |
| Salinarimonas | Rhizobiales | Liu et al. (2010) | . | ICNB |
| Salinella | | Brusca & Brusca (2003) | Domain Eucarya - Kingdom Animalia - Phylum Monoblastozoa. | ICZN |
| Salinibacillus | Bacillales | Ren & Zhou (2005) | . | ICNB |
| Salinibacter | | Garrity et al. (2005); Ludwig et al. (2011) | Domain Bacteria - Phylum Bacteroidetes - Class Cytophagia. | ICNB |
| Salinibacterium | Micrococcales | Han et al. (2003); Ludwig et al. (2012) | . | ICNB |
| Salinicoccus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Salinicola | Oceanospirillales | Anan'ina et al. (2007) | . | ICNB |
| Salinihabitans | Rhodobacterales | Yoon et al. (2009) | . | ICNB |
| Salinimicrobium | Flavobacteriales | Lim et al. (2008) | . | ICNB |
| Salinimonas | Alteromonadales | Jeon et al. (2005) | . | ICNB |
| Salinirepens | Flavobacteriales | Muramatsu et al. (2012) | . | ICNB |
| Salinisphaera | | Antunes et al. (2003) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. | ICNB |
| Salinispora | Micromonosporales | Maldonado et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Salinivibrio | Vibrionales | Garrity et al. (2005) | . | ICNB |
| Salinoctomys | Rodentia | Woods & Kilpatrick (2005) | . | ICZN |
| Salinomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Salipiger | Rhodobacterales | Martínez-Cánovas et al. (2004) | . | ICNB |
| Salirhabdus | Bacillales | Albuquerque et al. (2007) | . | ICNB |
| Salisaeta | | Vaisman & Oren (2009); Ludwig et al. (2011) | Domain Bacteria - Phylum Bacteroidetes - Class Cytophagia. | ICNB |
| Salisapilia | Peronosporales | Hulvey et al. (2010) | . | ICBN |
| Salisediminibacterium | Bacillales | Jiang et al. (2012) | . | ICNB |
| Salishia | Gigartinales | Clarkston & Saunders (2012) | . | ICBN |
| Salix | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Salmea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Salmonella | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Salomonelaps | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Salomonia | Fabales | Mabberley (2008) | Polygalaceae. | ICBN |
| Salpa | Salpida | Godeaux (1998) | . | ICZN |
| Salpianthus | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Salpichlaena | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Salpichroa | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Salpiglossis | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Salpinctes | Passeriformes | Clements (2007) | . | ICZN |
| Salpinga | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Salpingacantha | Tintinnida | Lynn (2008) | . | ICZN |
| Salpingella | Tintinnida | Lynn (2008) | . | ICZN |
| Salpingelloides | Tintinnida | Lynn (2008) | . | ICZN |
| Salpingoeca | Craspedida | Leadbeater & Thomsen (2000) | . | ICZN |
| Salpingorhiza | Craspedida | Nitsche et al. (2011) | . | ICZN |
| Salpingostylis | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Salpingotulus | Rodentia | Holden & Musser (2005) | . | ICZN |
| Salpingotus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Salpistele | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Salpixantha | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Salpornis | Passeriformes | Clements (2007) | . | ICZN |
| Salsola | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Salsuginibacillus | Bacillales | Carrasco et al. (2007) | . | ICNB |
| Saltator | Passeriformes | Clements (2007) | . | ICZN |
| Saltatricula | Passeriformes | Clements (2007) | . | ICZN |
| Saltera | Myrtales | Mabberley (2008) | Crypteroniaceae. | ICBN |
| Saltia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Saltuarius | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Saltugilia | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Salvadora | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Salvadora | Brassicales | Mabberley (2008) | Salvadoraceae. | ICBN |
| Salvadorina | Anseriformes | Clements (2007) | . | ICZN |
| Salvadoropsis | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Salvertia | Myrtales | Mabberley (2008) | Vochysiaceae. | ICBN |
| Salvia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Salvinia | Salviniales | Christenhusz et al. (2011) | . | ICBN |
| Salweenia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Salzmannia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Samaipaticereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Samanea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sambucus | Dipsacales | Mabberley (2008) | Adoxaceae. | ICBN |
| Sameraria | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Samolus | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Sampantaea | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Samsonia | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Samuelssonia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Samuraia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Samus | Spirophorida | Van Soest & Hooper (2002) | . | ICZN |
| Samyda | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Sanango | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Sanblasia | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Sanchezia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sanctambrosia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Sandalolitha | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Sandaracinobacter | Sphingomonadales | Garrity et al. (2005) | . | ICNB |
| Sandaracinus | Myxococcales | Mohr et al. (2012) | . | ICNB |
| Sandarakinorhabdus | Sphingomonadales | Gich & Overmann (2006) | . | ICNB |
| Sandarakinotalea | Flavobacteriales | Khan et al. (2006) | . | ICNB |
| Sandbergia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sandemania | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Sandeothallus | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Sanderella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sanderia | Semaeostomeae | Kramp (1961) | . | ICZN |
| Sandersonia | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Sandmanniella | Colpodida | Foissner & Stoeck (2009) | . | ICZN |
| Sandona | Glissomonadida | Howe et al. (2009) | . | ICZN |
| Sandoricum | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Sandwithia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Sangavella | Coloniales | Emschermann (1972) | Pedicellinidae. | ICZN |
| Sanguibacter | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Sanguinaria | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Sanguirana | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Sanguisorba | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Sanicula | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Saniculiophyllum | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Sanidastra | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Saniella | Asparagales | Mabberley (2008) | Hypoxidaceae. | ICBN |
| Sanionia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sanjuannemertes | | Iwata (2006); Kajihara et al. (2008) | Domain Eucarya - Kingdom Animalia - Phylum Nemertea - Class Hoplonemertea - Subclass Monostilifera. Now checking. | ICZN |
| Sankowskia | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Sanrafaelia | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Sansevieria | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Sansibia | Alcyonacea | Alderslade (2000) | Xeniidae. | ICZN |
| Santalum | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Santiria | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Santisukia | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Santolina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Santomasia | Malpighiales | Mabberley (2008) | Hypericaceae. | ICBN |
| Santosia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sanvitalia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sanzinia | Squamata | Vitt & Caldwell (2009) | Serpentes. Boidae. | ICZN |
| Sapayoa | Passeriformes | Clements (2007) | . | ICZN |
| Saphenophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Sapheopipo | Piciformes | Clements (2007) | . | ICZN |
| Saphesia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Sapindus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Sapium | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Saponaria | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Saposhnikovia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sappho | Apodiformes | Clements (2007) | . | ICZN |
| Sapphoa | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sappinia | Thecamoebida | Rogerson & Patterson (2000); Cavalier-Smith et al. (2004); Brown et al. (2007); Smirnov et al. (2011) | . | ICZN |
| Sapranthus | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Sapria | Malpighiales | Mabberley (2008) | Rafflesiaceae. | ICBN |
| Saprodinium | Odontostomatida | Lynn (2008) | . | ICZN |
| Saprolegnia | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Sapromyces | Rhipidiales | Dick (2001); Kirk et al. (2008) | Rhipidiaceae. | ICBN |
| Saproscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Saprosma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Saprospira | Sphingobacteriales | Garrity et al. (2005) | . | ICNB |
| Saraca | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Saracenaria | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Saracha | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Saranthe | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Sararanga | Pandanales | Mabberley (2008) | Pandanaceae. | ICBN |
| Sarawakodendron | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Sarcandra | Chloranthales | Mabberley (2008) | Chloranthaceae. | ICBN |
| Sarcanthemum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sarcanthopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarcaulus | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Sarcina | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Sarcinochrysis | Sarcinochrysidales | Andersen & Preisig (2000) | . | ICBN |
| Sarcobatus | Caryophyllales | Mabberley (2008) | Sarcobataceae. | ICBN |
| Sarcocapnos | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Sarcocephalus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sarcochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarcochlamys | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Sarcococca | Buxales | Mabberley (2008) | Buxaceae. | ICBN |
| Sarcocystis | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Sarcodes | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Sarcodia | Plocamiales | Schneider & Wynne (2007) | . | ICBN |
| Sarcodictyon | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Sarcodiotheca | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Sarcodraba | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sarcodum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sarcoglottis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarcoglyphis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarcogyps | Falconiformes | Clements (2007) | . | ICZN |
| Sarcolaena | Malvales | Mabberley (2008) | Sarcolaenaceae. | ICBN |
| Sarcolobus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sarcolophium | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Sarcomelicope | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Sarcomenia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sarconema | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Sarconeurum | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Sarcopera | Ericales | Mabberley (2008) | Marcgraviaceae. | ICBN |
| Sarcopetalum | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Sarcophilus | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Sarcophinanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Sarcophrynium | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Sarcophyte | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Sarcophyton | Alcyonacea | Bayer (1981) | Alcyoniidae. | ICZN |
| Sarcophyton | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarcopilea | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Sarcopoterium | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Sarcops | Passeriformes | Clements (2007) | . | ICZN |
| Sarcopteryx | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Sarcoptilus | Pennatulacea | Williams (1995) | . | ICZN |
| Sarcopygme | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sarcopyramis | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Sarcoramphus | Falconiformes | Clements (2007) | . | ICZN |
| Sarcorrhiza | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sarcosperma | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Sarcostigma | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Sarcostoma | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarcothalia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Sarcotheca | Oxalidales | Mabberley (2008) | Oxalidaceae. | ICBN |
| Sarcotoechia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Sarcotragus | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Sarcotrichia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sargentodoxa | Ranunculales | Mabberley (2008) | Lardizabalaceae. | ICBN |
| Sarkidiornis | Anseriformes | Clements (2007) | . | ICZN |
| Sarmenticola | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sarmienta | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Saroeca | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Saroglossa | Passeriformes | Clements (2007) | . | ICZN |
| Saropathes | Antipatharia | Opresko (2002) | . | ICZN |
| Sarostegia | Hexactinosida | Reiswig (2002) | . | ICZN |
| Sarothrura | Gruiformes | Clements (2007) | . | ICZN |
| Sarracenia | Ericales | Mabberley (2008) | Sarraceniaceae. | ICBN |
| Sarsia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Sarsiella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Sartidia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sartoria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sartorina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sartwellia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Saruma | Piperales | Mabberley (2008) | Aristolochiaceae. | ICBN |
| Sasa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sasakiella | Stauromedusae | Kramp (1961) | . | ICZN |
| Sasaokaea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sasia | Piciformes | Clements (2007) | . | ICZN |
| Sassafras | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Satakentia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Satanocrater | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Satellitenemertes | Eumonostilifera | Iwata (2006); Kajihara et al. (2008) | Closely related to Amphiporus. | ICZN |
| Sathrophilus | Philasterida | Lynn (2008) | . | ICZN |
| Sator | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Satranala | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Satrapa | Passeriformes | Clements (2007) | . | ICZN |
| Sattadia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Satureja | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Saturnalis | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Saturnospongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Satyria | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Satyrium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Saucerottia | Apodiformes | Clements (2007) | . | ICZN |
| Saudithrix | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Spirotrichea - Subclass Stichotrichia. | ICZN |
| Sauloma | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Saundersia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sauracanthorhynchus | Echinorhynchida | Bursey et al. (2007) | . | ICZN |
| Saurauia | Ericales | Mabberley (2008) | Actinidiaceae. | ICBN |
| Sauria | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Saurocytozoon | Haemospororida | Perkins et al. (2000) | . | ICZN |
| Saurodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Sauroglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sauroleishmania | Trypanosomatida | Moreira et al. (2004) | . | ICZN |
| Sauromalus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Sauromonas | Oxymonadida | Brugerolle & Lee (2000) | . | ICZN |
| Sauromys | Chiroptera | Simmons (2005) | . | ICZN |
| Sauroplasma | Piroplasmorida | Perkins et al. (2000) | . | ICZN |
| Sauropus | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Saururus | Piperales | Mabberley (2008) | Saururaceae. | ICBN |
| Saussurea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sauteria | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sautiera | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sauvagesia | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Sauvallea | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Savalia | Zoanthidea | Sinniger et al. (2005) | . | ICZN |
| Savangia | Platyctenida | Harbison & Madin (1982) | . | ICZN |
| Savannosiphon | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Savia | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Savignya | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Savillea | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Sawayella | Protococcidiorida | Perkins et al. (2000) | . | ICZN |
| Sawyeria | Lyromonadida | O'Kelly et al. (2003); Cavalier-Smith & Nikolaev (2008) | . | ICZN |
| Saxegothaea | Araucariales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Saxeibacter | Frankiales | Lee et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Saxicola | Passeriformes | Clements (2007) | . | ICZN |
| Saxicolella | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Saxicoloides | Passeriformes | Clements (2007) | . | ICZN |
| Saxifraga | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Saxifragodes | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Saxifragopsis | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Saxipendium | Helminthomorpha | Deland et al. (2010) | Harrimaniidae. | ICZN |
| Saxofridericia | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Sayornis | Passeriformes | Clements (2007) | . | ICZN |
| Scabiosa | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Scabrethia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Scabridens | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Scadoxus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Scaevola | Asterales | Mabberley (2008) | Goodeniaceae. | ICBN |
| Scagea | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Scagelia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Scageliopsis | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Scagelonema | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Scagelothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Scalarispongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Scalesia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Scaligeria | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Scalopus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Scambopus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Scandia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Scandix | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Scapania | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Scapaniella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Scapanulus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Scapanus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Scaphidiodon | Synhymeniida | Lynn (2008) | . | ICZN |
| Scaphiodontophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Scaphiophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Scaphiophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Scaphiophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Scaphiopus | Anura | Vitt & Caldwell (2009) | Scaphiopodidae. | ICZN |
| Scaphispatha | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Scaphium | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Scaphocalyx | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Scaphochlamys | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Scaphodinium | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Scaphopetalum | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Scaphophyllum | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Scaphosepalum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Scaphyglottis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Scapophyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Scapteromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Scaptochirus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Scaptonyx | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Scardovia | Bifidobacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Scaridium | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Scarthyla | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Scelochiloides | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Scelochilopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Scelochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sceloporus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Scelorchilus | Passeriformes | Clements (2007) | . | ICZN |
| Scelotes | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Scepanotrocha | Bdelloida | Segers (2002); Segers (2007) | . | ICZN |
| Sceptrella | Poecilosclerida | Samaai & Kelly (2002) | . | ICZN |
| Schackoinella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glabratellidae. | ICZN |
| Schaefferia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Schaferina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Discorbidae. | ICZN |
| Schaudinnella | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Schaudinnia | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Schaudinnula | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Schaueria | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Schedonorus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schedotrochilia | Dysteriida | Lynn (2008) | . | ICZN |
| Schefferomitra | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Schefflera | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Schefflerodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Schelhammera | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Schellackia | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Schenckochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schenkia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Scherffelia | Chlorodendrales | Moestrup (2000); Massjuk (2006) | . | ICBN |
| Scherochorella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Scherya | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schetba | Passeriformes | Clements (2007) | . | ICZN |
| Scheuchzeria | Alismatales | Mabberley (2008) | Scheuchzeriaceae. | ICBN |
| Schewiakoffia | Haptorida | Lynn (2008) | Nomen dubium. | ICZN |
| Schickendantziella | Asparagales | Mabberley (2008) | Alliaceae. | ICBN |
| Schiedea | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Schiedeella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schiekia | Commelinales | Mabberley (2008) | Haemodoraceae. | ICBN |
| Schiffneria | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Schiffneriolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Schiffornis | Passeriformes | Clements (2007) | . | ICZN |
| Schilleriella | Mischococcales | Ettl (1978) | . | ICBN |
| Schima | Ericales | Mabberley (2008) | Theaceae. | ICBN |
| Schimmelmannia | Acrosymphytales | Schneider & Wynne (2007) | . | ICBN |
| Schimpera | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Schimperella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Schimperobryum | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Schindleria | Caryophyllales | Mabberley (2008) | Phytolaccaceae. | ICBN |
| Schineria | Xanthomonadales | Garrity et al. (2005); Tóth et al. (2007) | Later homonym. Replaced by Ignatzschineria. | ICNB |
| Schinopsis | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Schinus | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Schinziella | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Schinziophyton | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Schippia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Schisandra | Austrobaileyales | Mabberley (2008) | Schisandraceae. | ICBN |
| Schischkinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schismaderma | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Schismatoclada | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schismatoglottis | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Schismocarpus | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Schismus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schistidium | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Schistocarpaea | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Schistocarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schistochila | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Schistochilopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Schistochlamys | Passeriformes | Clements (2007) | . | ICZN |
| Schistogyne | Gentianales | Mabberley (2008); Rapini et al. (2011) | Later synonym of Oxypetalum. | ICBN |
| Schistolais | Passeriformes | Clements (2007) | . | ICZN |
| Schistometopum | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Schistomitrium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Schistonema | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Schistophragma | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Schistophrya | Peniculida | Lynn (2008) | . | ICZN |
| Schistostega | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Schistostemon | Malpighiales | Mabberley (2008) | Humiriaceae. | ICBN |
| Schistostephium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schistotylus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schizachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schizachyrium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schizacme | Gentianales | Mabberley (2008) | Loganiaceae. | ICBN |
| Schizactinia | Exogenida | Lynn (2008) | . | ICZN |
| Schizaea | Schizaeales | Christenhusz et al. (2011) | . | ICBN |
| Schizammina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Schizamminidae. | ICZN |
| Schizanthus | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Schizeilema | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Schizenterospermum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schizoboea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Schizocalyptra | Pleuronematida | Lynn (2008) | . | ICZN |
| Schizocardium | Helminthomorpha | Benito (1982) | Spengelidae. | ICZN |
| Schizocarphus | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Schizocarpum | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Schizocaryum | Philasterida | Lynn (2008) | . | ICZN |
| Schizochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schizochlaenion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Schizochytriodinium | Gymnodiniales | Fensome et al. (1993) | . | ICBN |
| Schizochytrium | Thraustochytriales | Dick (2001); Kirk et al. (2008) | Thraustochytriaceae. | ICBN |
| Schizocladia | Schizocladiales | Kawai et al. (2003) | . | ICBN |
| Schizocolea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schizoculina | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Schizocyathus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Schizocystis | Neogregarinorida | Perkins et al. (2000); Özdikmen (2009) | Junior homonym. Substituted by Aliona. | ICZN |
| Schizodinium | | Fensome et al. (1993); Skovgaard et al. (2007) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. Former Blastodiniales. | ICBN |
| Schizodium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schizoeaca | Passeriformes | Clements (2007) | . | ICZN |
| Schizoglossum | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Schizogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schizolaena | Malvales | Mabberley (2008) | Sarcolaenaceae. | ICBN |
| Schizolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Schizomeria | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Schizonepeta | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Schizoneurina | Ceramiales | Wynne & Schneider (2010) | Later synonym of Erythroglossum. | ICBN |
| Schizopathes | Antipatharia | Opresko (2002) | . | ICZN |
| Schizopepon | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Schizopetalon | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Schizophragma | Cornales | Mabberley (2008) | Hydrangeaceae. | ICBN |
| Schizoplasmodiopsis | Protosteliales | Olive (1975) | . | ICBN |
| Schizoplasmodium | Protosteliales | Olive (1975) | . | ICBN |
| Schizopsera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schizosepala | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Schizoseris | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Schizostachyum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schizostigma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schizothrix | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Schizotorenia | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Schizotricha | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Schizotrichia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schizozygia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Schizymenia | Nemastomatales | Schneider & Wynne (2007) | . | ICBN |
| Schizymenium | Bryales | Goffinet et al. (2009) | . | ICBN |
| Schkuhria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schlechtendalia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schlechteranthus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Schlechterella | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Schlechterina | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Schlegelella | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Schlegelia | Lamiales | Mabberley (2008) | Schlegeliaceae. | ICBN |
| Schleichera | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Schleiferia | Flavobacteriales | Albuquerque et al. (2011) | . | ICNB |
| Schleinitzia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Schlesneria | Planctomycetales | Kulichevskaya et al. (2007) | . | ICNB |
| Schliephackea | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Schlimmia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schljakovia | Jungermanniales | Söderström et al. (2010) | . | ICBN |
| Schljakovianthus | Jungermanniales | Söderström et al. (2010) | . | ICBN |
| Schlotheimia | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Schlumbergera | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Schlumbergerella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Calcarinidae. | ICZN |
| Schlumbergerina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Schmalhausenia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schmardaea | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Schmidleinema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Schmidtia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schmidtottia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schmitzia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Schmitziella | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Schnabelia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Schneideria | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Schoenbornia | Arcellinida | Meisterfeld (2000) | Difflugina -- Nebelidae. | ICZN |
| Schoenefeldia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Schoenia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Schoenicola | Passeriformes | Clements (2007) | . | ICZN |
| Schoeniophylax | Passeriformes | Clements (2007) | . | ICZN |
| Schoenobiblus | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Schoenobryum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Schoenocaulon | Liliales | Mabberley (2008) | Melanthiaceae. | ICBN |
| Schoenocephalium | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Schoenolaena | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Schoenolirion | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Schoenoplectus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Schoenorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schoenus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Schoepfia | Santalales | Mabberley (2008) | Schoepfiaceae. | ICBN |
| Schofieldia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Schofieldiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Schoinobates | Australidelphia | McKenna & Bell (1997); Groves (2005) | Later synonym of Petauroides. | ICZN |
| Scholleropsis | Commelinales | Mabberley (2008) | Pontederiaceae. | ICBN |
| Scholtzia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Schotia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Schottera | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Schoutedenapus | Apodiformes | Clements (2007) | . | ICZN |
| Schoutenia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Schouwia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Schradera | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schraderella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Schrebera | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Schreiteria | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Schrenkia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Schroedera | Microsporida | Morris & Adams (2002) | . | ICZN |
| Schroederichthys | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Schroeterella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Schtschurowskia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Schubertia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Schuitemania | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schulmania | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Schultesia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Schultesianthus | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Schultesiophytum | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Schultzella | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagynidae. | ICZN |
| Schulzeviella | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Schulzia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Schumacheria | Dilleniales | Mabberley (2008) | Dilleniaceae. | ICBN |
| Schumannella | Micrococcales | An et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Schumannianthus | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Schumanniophyton | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schunkea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Schusterolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Schuurmansia | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Schuurmansiella | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Schwabia | Arcellinida | Meisterfeld (2000) | Difflugina -- Difflugiidae. | ICZN |
| Schwackaea | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Schwalbea | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Schwantesia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Schwantzia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Oridorsalidae. | ICZN |
| Schwartzia | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Schwartzia | Ericales | Mabberley (2008) | Marcgraviaceae. | ICBN |
| Schweiggeria | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Schweinfurthia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Schwenckia | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Schwendenera | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Schwetschkea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Schwetschkeopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sciadiophora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Sciadocephala | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sciadocladus | Hypnodendrales | Goffinet et al. (2009) | . | ICBN |
| Sciadophycus | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Sciadopitys | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Sciadotenia | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Sciaphila | Pandanales | Mabberley (2008) | Triuridaceae. | ICBN |
| Sciaromiella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sciaromiopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Scilla | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Scinaia | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Scinax | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Scincella | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Scincopus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Scincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Scindapsus | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Sciothamnus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Scipionospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Scirpodendron | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Scirpoides | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Scirpus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Sciscionella | Pseudonocardiales | Tian et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Scissirostrum | Passeriformes | Clements (2007) | . | ICZN |
| Sciurillus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sciuro-hypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sciuroleskea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sciurotamias | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sciurothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sciurula | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Sciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sciviamonas | | Howe et al. (2009) | Domain Eucarya (probably a member of bikonts). | ICZN |
| Sclateria | Passeriformes | Clements (2007) | . | ICZN |
| Scleracis | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |
| Scleranthelia | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Scleranthopsis | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Scleranthus | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Sclerhelia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Scleria | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Scleritoderma | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Scleritodermidae. | ICZN |
| Sclerobelemnon | Pennatulacea | Williams (1995) | . | ICZN |
| Scleroblitum | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sclerocactus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Sclerocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sclerochiton | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sclerochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sclerochorton | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sclerocollum | Echinorhynchida | Amin (1985); Pichelin & Cribb (2001) | Junior synonym of Diplosentis. | ICZN |
| Sclerocroton | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Sclerodactylon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sclerodinium | Ptychodiscales | Fensome et al. (1993) | . | ICBN |
| Sclerodontium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Scleroglossum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Sclerohypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sclerolaena | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sclerolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Scleronema | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Scleronephthya | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Scleronycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Sclerophthora | Peronosporales | Dick (2001); Kirk et al. (2008) | Peronosporaceae. | ICBN |
| Sclerophylax | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Scleroplegma | Lychniscosida | Reiswig (2002) | . | ICZN |
| Scleropodium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Scleropogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Scleroptilum | Pennatulacea | Williams (1995) | . | ICZN |
| Scleropyrum | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Sclerorhachis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sclerosperma | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Sclerospora | Peronosporales | Dick (2001); Kirk et al. (2008) | Peronosporaceae. | ICBN |
| Sclerostegia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sclerostephane | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sclerothamnopsis | Hexactinosida | Reiswig (2002) | . | ICZN |
| Sclerothamnus | Hexactinosida | Reiswig (2002) | . | ICZN |
| Sclerotheca | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Sclerotiaria | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sclerurus | Passeriformes | Clements (2007) | . | ICZN |
| Scolanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Scolecomorphus | Gymnophiona | Vitt & Caldwell (2009) | Scolecomorphidae. | ICZN |
| Scolecophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Scolecoseps | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Scoliaxon | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Scoliodon | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Scoliolegnia | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Scolionema | Limnomedusae | Bouillon et al. (2006) | . | ICZN |
| Scoliopus | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Scoliosorus | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Scolochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Scolomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Scolopax | Charadriiformes | Clements (2007) | . | ICZN |
| Scolopes | Hadromerida | Rützler (2002) | . | ICZN |
| Scolophyllum | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Scolopia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Scolosanthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Scolymia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Scolymus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Scopalina | Halichondrida | Van Soest et al. (2002) | . | ICZN |
| Scoparia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Scopellaria | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Scopelogena | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Scopelophila | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Scopolia | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Scopulata | Peritrichida | Lynn (2008); Zhan et al. (2009) | Later synonym of Apiosoma. | ICZN |
| Scopulophila | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Scopus | Ciconiiformes | Clements (2007) | . | ICZN |
| Scorodocarpus | Santalales | Mabberley (2008) | Erythropalaceae. | ICBN |
| Scorodophloeus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Scorpidium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Scorpiothyrsus | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Scorpiurium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Scorpiurus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Scorzonera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Scoteanax | Chiroptera | Simmons (2005) | . | ICZN |
| Scotinomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Scotobleps | Anura | Vitt & Caldwell (2009) | Arthroleptidae. | ICZN |
| Scotocerca | Passeriformes | Clements (2007) | . | ICZN |
| Scotoecus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Scotomanes | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Scotonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Scotopelia | Strigiformes | Clements (2007) | . | ICZN |
| Scotophilus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Scotorepens | Chiroptera | Simmons (2005) | . | ICZN |
| Scotozous | Chiroptera | Simmons (2005) | . | ICZN |
| Scottellia | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Scouleria | Scouleriales | Goffinet et al. (2009) | . | ICBN |
| Scourfieldia | Scourfieldiales | Moestrup (1991) | . | ICBN |
| Scribneria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Scrippsia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Scrippsiella | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Scrithacola | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Scrobicaria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Scrofella | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Scrophularia | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Scurrula | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Scutachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Scutellaria | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Scutia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Scuticaria | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Scutiger | Anura | Vitt & Caldwell (2009) | Megophryidae. | ICZN |
| Scutinanthe | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Scutisorex | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Scybalium | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Scyliorhinus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Scylliogaleus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Scymnodalatias | Squaliformes | Nelson (2006) | . | ICZN |
| Scymnodon | Squaliformes | Nelson (2006) | . | ICZN |
| Scyphanthus | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Scyphidia | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Scyphidiella | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Scyphidium | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Scyphiphora | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Scyphocephalium | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Scyphochlamys | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Scyphonychium | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Scyphopodium | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Scyphosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Pontosphaeraceae. | ICBN |
| Scyphostachys | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Scyphostegia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Scyphosyce | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Scytaliopsis | Pennatulacea | Williams (1995) | . | ICZN |
| Scytalium | Pennatulacea | Williams (1995) | . | ICZN |
| Scytalopus | Passeriformes | Clements (2007) | . | ICZN |
| Scythrophrys | Anura | Vitt & Caldwell (2009) | Leptodactylidae. | ICZN |
| Scythrops | Cuculiformes | Clements (2007) | . | ICZN |
| Scytomonas | Sphenomonadales | Leedale (2000) | . | ICBN |
| Scytonema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Scytonematopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Scytopetalum | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Scytophorus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Seabrookia | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glandulinidae. | ICZN |
| Seagriefia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sebaea | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Sebaldella | Fusobacteriales | Garrity et al. (2005) | . | ICNB |
| Sebastiania | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Sebastiano-schaueria | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sebdenia | Sebdeniales | Schneider & Wynne (2007) | . | ICBN |
| Secale | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Secamone | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Secamonopsis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sechellophryne | Anura | Vitt & Caldwell (2009) | Sooglossidae. | ICZN |
| Sechiopsis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Sechium | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Secondatia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Securidaca | Fabales | Mabberley (2008) | Polygalaceae. | ICBN |
| Securigera | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Securinega | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Seddera | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Sedimentibacter | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Sedimenticola | | Narasingarao & Häggblom (2006) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria . | ICNB |
| Sediminibacillus | Bacillales | Carrasco et al. (2008) | . | ICNB |
| Sediminibacter | Flavobacteriales | Khan et al. (2007) | . | ICNB |
| Sediminibacterium | Sphingobacteriales | Qu & Yuan (2008) | . | ICNB |
| Sediminicola | Flavobacteriales | Khan et al. (2006) | . | ICNB |
| Sediminihabitans | Micrococcales | Hamada et al. (2012) | . | ICNB |
| Sediminimonas | Rhodobacterales | Wang et al. (2009) | . | ICNB |
| Sediminitomix | Cytophagales | Khan et al. (2007); Ludwig et al. (2011) | . | ICNB |
| Sedirea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sedum | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Seegeriella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Seemannaralia | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Seepactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Seetzenia | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Segetibacter | Sphingobacteriales | An et al. (2007) | . | ICNB |
| Segmentochona | Exogemmida | Lynn (2008) | . | ICZN |
| Segniliparus | Corynebacteriales | Butler et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Segonzactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Seguenzaea | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Seguieria | Caryophyllales | Mabberley (2008) | Phytolaccaceae. | ICBN |
| Sehima | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sehnemobryum | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Seicercus | Passeriformes | Clements (2007) | . | ICZN |
| Seidelia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Seidenfadenia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Seidenfadeniella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Seidlitzia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Seinonella | Bacillales | Yoon et al. (2005) | . | ICNB |
| Seirospora | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Seison | Seisonida | Segers (2002); Segers (2007) | . | ICZN |
| Seiurus | Passeriformes | Clements (2007) | . | ICZN |
| Sejongia | Flavobacteriales | Yi et al. (2005); Kämpfer et al. (2009) | Later synonym of Chryseobacterium. | ICNB |
| Sejunctella | Spirillinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spirillinidae. | ICZN |
| Sekeetamys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Selaginella | Selaginellales | Christenhusz et al. (2011) | . | ICBN |
| Selago | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Selasphorus | Apodiformes | Clements (2007) | . | ICZN |
| Selenia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Selenicereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Selenidera | Piciformes | Clements (2007) | . | ICZN |
| Selenidioides | Archigregarinorida | Perkins et al. (2000); Rueckert & Leander (2009) | Junior synonym of Selenidium. | ICZN |
| Selenidium | Archigregarinorida | Perkins et al. (2000); Rueckert & Leander (2009) | Selenidiidae. | ICZN |
| Selenihalanaerobacter | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Selenipedium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Selenococcidium | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Selenocystis | Archigregarinorida | Perkins et al. (2000); Rueckert & Leander (2009) | Selenidiidae. | ICZN |
| Selenomonas | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Selenophaea | Phaeothamniales | Bailey et al. (1998) | . | ICBN |
| Seleucidis | Passeriformes | Clements (2007) | . | ICZN |
| Selevinia | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Seliberia | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Seligeria | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Selinopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Selinum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Selkia | | Wynne & Schneider (2010) | . | ICBN |
| Selkirkia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Selliera | Asterales | Mabberley (2008) | Goodeniaceae. | ICBN |
| Selliguea | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Selloa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sellocharis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Selysia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Selysina | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Semaeognathia | Bursovaginoidea | Sørensen (2002) | . | ICZN |
| Sematophyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Semecarpus | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Semele | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Semenovaia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Semenovia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Semialarium | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Semiaquilegia | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Semiarundinaria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Semiboveria | Thigmotrichida | Lynn (2008) | . | ICZN |
| Semigordionus | Gordioidea | Schmidt-Rhaesa (2002); Poinar Jr. (2008) | . | ICZN |
| Semihia | Sphenomonadales | Leedale (2000); Özdikmen (2009) | Substitute name for Metanema. | ICBN |
| Semiliquidambar | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Semimorula | Echinosteliales | Haskins et al. (1983); Fiore-Donno et al. (2009) | . | ICBN |
| Seminatrix | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Semioptera | Passeriformes | Clements (2007) | . | ICZN |
| Semiplatyophrya | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Semipsammina | Psamminida | Gooday & Tendal (2000) | . | ICZN |
| Semiramisia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Semiria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Semispathidium | Haptorida | Lynn (2008) | . | ICZN |
| Semisuberites | Poecilosclerida | Van Soest & Hajdu (2002) | . | ICZN |
| Semitaspongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Semitrichodina | Mobilida | Lynn (2008) | . | ICZN |
| Semnocarpa | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Semnodactylus | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Semnoderes | Cyclorhagida | Higgins (1990) | . | ICZN |
| Semnopithecus | Primates | Groves (2005) | . | ICZN |
| Semnornis | Piciformes | Clements (2007) | . | ICZN |
| Semperella | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Semperina | Alcyonacea | Bayer (1981) | Anthothelidae. | ICZN |
| Sempervivum | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Senaea | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Senecio | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Senefeldera | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Senefelderopsis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Senegalia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Senna | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Senoma | Microsporida | Simakova et al. (2005) | . | ICZN |
| Senra | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Senticolis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Senyumia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Seohaeicola | Rhodobacterales | Yoon et al. (2009) | . | ICNB |
| Sepetibaella | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Trochamminidae. | ICZN |
| Sephanoides | Apodiformes | Clements (2007) | . | ICZN |
| Seppeltia | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Sepsina | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Sepsophis | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Septata | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Septemcapsula | Multivalvulida | Lom & Dyková (2006) | . | ICZN |
| Septotextularia | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Textulariidae. | ICZN |
| Septotheca | Malvales | Mabberley (2008) | Bombacaceae. | ICBN |
| Septotrochammina | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Remaneicidae. | ICZN |
| Septulina | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Septuma | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Komokiidae. | ICZN |
| Sequoia | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Sequoiadendron | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Serapias | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Seravinella | Strombidiida | Lynn (2008) | . | ICZN |
| Serenoa | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Sergeia | Trypanosomatida | Svobodová et al. (2007) | . | ICZN |
| Sergia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Serianthes | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Seriatopora | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Sericanthe | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Serichonus | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Sericocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sericocoma | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sericocomopsis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sericodes | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Sericolea | Oxalidales | Mabberley (2008) | Elaeocarpaceae. | ICBN |
| Sericolophus | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Sericorema | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sericornis | Passeriformes | Clements (2007) | . | ICZN |
| Sericospora | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sericossypha | Passeriformes | Clements (2007) | . | ICZN |
| Sericostachys | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sericulus | Passeriformes | Clements (2007) | . | ICZN |
| Serilophus | Passeriformes | Clements (2007) | . | ICZN |
| Seringia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Serinibacter | Micrococcales | Hamada et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Serinicoccus | Micrococcales | Yi et al. (2004); Ludwig et al. (2012) | . | ICNB |
| Serinus | Passeriformes | Clements (2007) | . | ICZN |
| Seriocarpa | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Styelidae. | ICZN |
| Serissa | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Serjania | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Serpens | Pseudomonadales | Garrity et al. (2005) | . | ICNB |
| Serpentichona | Exogemmida | Lynn (2008) | . | ICZN |
| Serpocaulon | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Serpoleskea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Serpophaga | Passeriformes | Clements (2007) | . | ICZN |
| Serpotortella | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Serpulina | Spirochaetales | Garrity et al. (2005); Stanton (2011) | Later synonym of Brachyspira. | ICNB |
| Serrasentis | Echinorhynchida | Amin (1985) | . | ICZN |
| Serrasentoides | Echinorhynchida | Amin (1985) | . | ICZN |
| Serratia | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Serraticardia | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Serratosagitta | Aphragmophora | Bieri (1991) | Sagittidae. | ICZN |
| Serratula | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Serruria | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Sertifera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sertularella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Sertularelloides | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Sertularia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Sertumia | Philasterida | Lynn (2008) | . | ICZN |
| Servetia | Desmothoracida | Mikrjukov et al. (2000); Adl et al. (2005) | Other Heliozoa. | ICZN |
| Sesamoides | Brassicales | Mabberley (2008) | Resedaceae. | ICBN |
| Sesamothamnus | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Sesamum | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Sesbania | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Seselia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Seselopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Seshagiria | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sesleria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sesuvium | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Setaria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Setariopsis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Setchellanthus | Brassicales | Mabberley (2008) | Setchellanthaceae. | ICBN |
| Sethophormis | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Setiacis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Seticephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Setidium | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Scleritodermidae. | ICZN |
| Setifer | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Tenrecidae. | ICZN |
| Setodiscophrya | Evaginogenida | Lynn (2008) | . | ICZN |
| Setonix | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Setonophrys | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Setophaga | Passeriformes | Clements (2007) | . | ICZN |
| Setopus | Chaetonotida | Balsamo et al. (2009) | . | ICZN |
| Setornis | Passeriformes | Clements (2007) | . | ICZN |
| Setulocarya | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Sevada | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Severonis | Exogenida | Lynn (2008) | . | ICZN |
| Sewardiella | Fossombroniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sexangularia | Arcellinida | Meisterfeld (2000) | Difflugina -- Difflugiidae. | ICZN |
| Sextonia | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Seychellaria | Pandanales | Mabberley (2008) | Triuridaceae. | ICBN |
| Seymeria | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Seymeriopsis | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Seyrigia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Shafera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Shaferocharis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Shamkiriella | Arcellinida | Snegovaya & Alekperov (2005) | Shamkiriidae (related to Difflugiidae?). | ICZN |
| Shangrilaia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sharpea | Erysipelotrichales | Morita et al. (2008); Ludwig et al. (2009) | . | ICNB |
| Sheareria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sheilanthera | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Shellephelota | Exogenida | Lynn (2008) | . | ICZN |
| Shellositon | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Shepheardella | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Shepherdia | Rosales | Mabberley (2008) | Elaeagnaceae. | ICBN |
| Shepleya | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sheppardia | Passeriformes | Clements (2007) | . | ICZN |
| Sherardia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sherbournia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Shewanella | Alteromonadales | Garrity et al. (2005) | . | ICNB |
| Shibataea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Shigella | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Shimazuella | Bacillales | Park et al. (2007) | . | ICNB |
| Shimia | Rhodobacterales | Choi & Cho (2006) | . | ICNB |
| Shimwellia | Enterobacteriales | Priest & Barker (2010) | . | ICNB |
| Shinella | Rhizobiales | An et al. (2006) | . | ICNB |
| Shinisaurus | Squamata | Vitt & Caldwell (2009) | Xenosauridae. | ICZN |
| Shinnersoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Shirakiopsis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Shiuyinghua | Lamiales | Mabberley (2008) | Paulowniaceae. | ICBN |
| Shorea | Malvales | Mabberley (2008) | Dipterocarpaceae. | ICBN |
| Shortia | Ericales | Mabberley (2008) | Diapensiaceae. | ICBN |
| Shoshonea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Shuteria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Shuttleworthia | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Sialia | Passeriformes | Clements (2007) | . | ICZN |
| Siamanthus | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Siamosia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Siapaea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sibara | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sibaropsis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sibiraea | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Sibogagorgia | Alcyonacea | Bayer (1981) | Paragorgiidae. | ICZN |
| Siboganemertes | Reptantia | Gibson (1995) | . | ICZN |
| Sibogella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Sibogita | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Sibon | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Sibopathes | Antipatharia | Opresko (2003) | . | ICZN |
| Sibthorpia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Sibynomorphus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Sibynophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Sicalis | Passeriformes | Clements (2007) | . | ICZN |
| Sicana | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Sichuania | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sicista | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sicrea | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Sicuophora | Clevelandellida | Lynn (2008) | . | ICZN |
| Sicydium | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Sicyoidochytrium | Thraustochytriales | Yokoyama et al. (2007) | . | ICBN |
| Sicyonis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Sicyopus | Actiniaria | Fautin et al. (2007) | Junior homonym, but no replacement name was published. | ICZN |
| Sicyos | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Sicyosperma | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Sida | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Sidalcea | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Sidasodes | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Sidastrum | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Sidebottomina | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Robertinidae. | ICZN |
| Sideractis | Corallimorpharia | Fautin et al. (2007) | . | ICZN |
| Siderasis | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Siderastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Sideritis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Siderodendron | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Sideroxylon | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Sidneioides | Aplousobranchia | Monniot & Monniot (1972); Monniot (2001) | Polyclinidae. | ICZN |
| Sidnyum | Aplousobranchia | Monniot & Monniot (1972); Kott (1998) | Junior synonym of Aplidium. | ICZN |
| Sidonops | Astrophorida | Uriz (2002) | . | ICZN |
| Sidotheca | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Siebenrockiella | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Siebera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Siedleckia | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Siegfriedia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Siemensia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sievekingia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sieversandreas | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Sieversia | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Sigalasia | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. Nomen dubium. | ICZN |
| Sigaloseps | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Sigelus | Passeriformes | Clements (2007) | . | ICZN |
| Sigesbeckia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sigillina | Aplousobranchia | Kott (1998) | Holozoidae. | ICZN |
| Sigiweddelia | Narcomedusae | Bouillon et al. (2006) | . | ICZN |
| Sigmatostalix | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sigmavirgulina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Fursenkoinidae. | ICZN |
| Sigmaxinella | Poecilosclerida | Hajdu & Van Soest (2002) | . | ICZN |
| Sigmella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992); Özdikmen (2009) | Junior homonym. Substituted by Novosigmella. | ICZN |
| Sigmeurypon | Poecilosclerida | Hooper (2002) | . | ICZN |
| Sigmoceros | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001); Grubb (2005) | Artiodactyla. Later synonym of Alcelaphus. | ICZN |
| Sigmocineta | Dysteriida | Lynn (2008) | . | ICZN |
| Sigmodon | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sigmodontomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sigmoidella | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Polymorphinidae. | ICZN |
| Sigmoihauerina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmoilina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmoilinella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmoilinita | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmoilopsis | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmoinella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmomorphina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Polymorphinidae. | ICZN |
| Sigmophrya | Astomatida | Lynn (2008) | . | ICZN |
| Sigmopyrgo | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sigmosceptrella | Poecilosclerida | Kelly & Samaai (2002) | . | ICZN |
| Sigmostomum | Peniculida | Lynn (2008) | Later synonym of Frontonia?. | ICZN |
| Sikorops | Haptorida | Lynn (2008) | . | ICZN |
| Silanimonas | Xanthomonadales | Lee et al. (2005) | . | ICNB |
| Silaum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Silene | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Silenella | Evaginogenida | Lynn (2008) | . | ICZN |
| Silentvalleya | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Silhouetta | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Siliconodosarina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Silicularia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Siliquamomum | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Siliquariaspongia | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Theonellidae. | ICZN |
| Siloxerus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Silphium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Siluania | Pseudodendromonadales | Cavalier-Smith & Chao (2006) | . | ICZN |
| Silurana | Anura | Vitt & Caldwell (2009) | Pipidae. | ICZN |
| Silverstoneia | Anura | Vitt & Caldwell (2009) | Dendrobatidae. | ICZN |
| Silvianthus | Lamiales | Mabberley (2008) | Carlemanniaceae. | ICBN |
| Silviella | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Silvimonas | Neisseriales | Yang et al. (2005) | . | ICNB |
| Silvorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Silybum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Simethis | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Simias | Primates | Groves (2005) | . | ICZN |
| Simicratea | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Simiduia | | Shieh et al. (2008) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. | ICNB |
| Similomerona | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Simira | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Simirestis | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Simiscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Simkania | Chlamydiales | Garrity et al. (2005) | . | ICNB |
| Simmondsia | Caryophyllales | Mabberley (2008) | Simmondsiaceae. | ICBN |
| Simonsiella | Neisseriales | Garrity et al. (2005) | . | ICNB |
| Simophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Simoselaps | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Simoxenops | Passeriformes | Clements (2007) | . | ICZN |
| Simplastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Simplicia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Simplicimonas | Tritrichomonadida | Cepicka et al. (2010) | . | ICZN |
| Simplicispira | Burkholderiales | Grabovich et al. (2006) | . | ICNB |
| Simplicomorpha | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Simsagittifera | Acoela | Faubel & Noreña (2001) | . | ICZN |
| Simsia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Simuliospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Sinacalia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sinadoxa | Dipsacales | Mabberley (2008) | Adoxaceae. | ICBN |
| Sinaiella | Oscillatoriales | Yamagishi (2007) | . | ICBN |
| Sinantherina | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Sinapidendron | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sinapis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sinclairia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sindechites | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sindora | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sindoropsis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sinecloaca | Aplousobranchia | Monniot & Monniot (1972) | Didemnidae. | ICZN |
| Singhamoeba | Schizopyrenida | De Jonckheere & Brown (2005) | Junior synonym of Tetramitus. | ICZN |
| Singularimonas | Xanthomonadales | Friedrich & Lipski (2008); Sheu et al. (2011) | Later synonym of Solimonas. | ICNB |
| Singulisphaera | Planctomycetales | Kulichevskaya et al. (2008) | . | ICNB |
| Sinia | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Sinisteroffia | Appendicularia | Fenaux (1998) | . | ICZN |
| Sinningia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Sinoadina | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sinobaca | Bacillales | Li et al. (2008) | Replacement name of Sinococcus.. | ICNB |
| Sinobacter | Xanthomonadales | Zhou et al. (2008); Sheu et al. (2011) | Later synonym of Solimonas. | ICNB |
| Sinobambusa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sinocalliergon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sinocarum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sinochasea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sinococcus | Bacillales | Li et al. (2006); Li et al. (2008) | Later homonym. Replaced by Sinobaca.. | ICNB |
| Sinocrassula | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Sinodinium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Sinodolichos | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sinofranchetia | Ranunculales | Mabberley (2008) | Lardizabalaceae. | ICBN |
| Sinojackia | Ericales | Mabberley (2008) | Styracaceae. | ICBN |
| Sinojohnstonia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Sinolimprichtia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sinomenium | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Sinomonas | Micrococcales | Zhou et al. (2009); Ludwig et al. (2012) | . | ICNB |
| Sinonatrix | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Sinopanax | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Sinophysis | Dinophysiales | Fensome et al. (1993) | . | ICBN |
| Sinoradlkofera | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Sinorhizobium | Rhizobiales | Garrity et al. (2005); Young (2003) | Later synonym of Ensifer.. | ICNB |
| Sinosenecio | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sinosiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sinosporangium | Streptosporangiales | Zhang et al. (2011); Ludwig et al. (2012) | Streptosporangineae. | ICNB |
| Sinowilsonia | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Sinskea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sinularia | Alcyonacea | Bayer (1981) | Alcyoniidae. | ICZN |
| Sinuolinea | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Siolineus | Heteronemertea | Gibson (1995) | . | ICZN |
| Siolmatra | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Sipanea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sipaneopsis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sipapoantha | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Siparuna | Laurales | Mabberley (2008) | Siparunaceae. | ICBN |
| Siphanthera | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Siphlophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Siphobigenerina | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Valvulinidae. | ICZN |
| Siphocampe | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Siphocampylus | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Siphocodon | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Siphocranion | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Siphogenerina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphogenerinoididae. | ICZN |
| Siphoglobulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glandulinidae. | ICZN |
| Sipholagena | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Siphomarginulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Siphomonas | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Siphonactinia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Siphonactinopsis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Siphonammina | Astrorhizida | Kaminski (2008) | Hippocrepinidae. | ICZN |
| Siphonandra | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Siphonandrium | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Siphonaperta | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Siphonaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Siphoneugena | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Siphonidia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Pegidiidae. | ICZN |
| Siphonidium | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Siphonidiidae. | ICZN |
| Siphoniferoides | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Pseudogaudryinidae. | ICZN |
| Siphonina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphoninidae. | ICZN |
| Siphoninella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphoninidae. | ICZN |
| Siphoninoides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Siphoninidae. | ICZN |
| Siphonobacter | Cytophagales | Táncsics et al. (2010); Ludwig et al. (2011) | . | ICNB |
| Siphonochalina | Haplosclerida | Desqueyroux-Faúndez & Valentine (2002) | . | ICZN |
| Siphonochilus | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Siphonodon | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Siphonodosaria | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Stilostomellidae. | ICZN |
| Siphonogorgia | Alcyonacea | Bayer (1981) | Nidaliidae. | ICZN |
| Siphonohydra | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Siphonolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Siphononema | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Siphonops | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Siphonorhis | Caprimulgiformes | Clements (2007) | . | ICZN |
| Siphonosphaera | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Siphonosphaera | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Siphonostegia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Siphotextularia | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Textulariidae. | ICZN |
| Siphotrochammina | Trochamminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Trochamminidae. | ICZN |
| Siphouvigerina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Uvigerinidae. | ICZN |
| Sipodotus | Passeriformes | Clements (2007) | . | ICZN |
| Sipolisia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Siptornis | Passeriformes | Clements (2007) | . | ICZN |
| Siptornopsis | Passeriformes | Clements (2007) | . | ICZN |
| Siraitia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Siren | Caudata | Vitt & Caldwell (2009) | Sirenidae. | ICZN |
| Sirenoscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Sirhookera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sirindhornia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sirochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sirocladium | Zygnematales | Gontcharov (2008) | . | ICBN |
| Sirocoleum | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Sirodotia | Batrachospermales | Schneider & Wynne (2007) | . | ICBN |
| Sirogonium | Zygnematales | Drummond et al. (2005); Gontcharov (2008) | Possibly synonymous to Spyrogyra. | ICBN |
| Siroloxophyllum | Pleurostomatida | Lynn (2008) | . | ICZN |
| Sirolpidium | | Dick (2001); Kirk et al. (2008) | Domain Eucarya - Kingdom Straminipila - Phylum Oomycota. Sirolpidiaceae. | ICBN |
| Sirystes | Passeriformes | Clements (2007) | . | ICZN |
| Sison | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sissonia | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Sistrurus | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Sisymbriopsis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sisymbrium | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sisyndite | Zygophyllales | Mabberley (2008) | Zygophyllaceae. | ICBN |
| Sisyranthus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sisyrinchium | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Sisyrolepis | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Sitana | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Sitanion | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sitta | Passeriformes | Clements (2007) | . | ICZN |
| Sittasomus | Passeriformes | Clements (2007) | . | ICZN |
| Sittiparus | Passeriformes | Clements (2007) | . | ICZN |
| Situla | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Octacnemidae. | ICZN |
| Sium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sivatoshella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Skaiostyela | Stolidobranchia | Monniot & Monniot (1972) | Styelidae. | ICZN |
| Skamnarium | Alcyonacea | Alderslade (2000) | Alcyoniidae. | ICZN |
| Skeletonella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Skeptrostachys | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Skermanella | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Skermania | Corynebacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Skiadosphaera | Mischococcales | Ettl (1978) | . | ICBN |
| Skiatophytum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Skimmia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Sklerochlamys | Mischococcales | Ettl (1978) | . | ICBN |
| Skottsbergia | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Skrjabinella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Skutchia | Passeriformes | Clements (2007) | . | ICZN |
| Skytanthus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Slackia | Coriobacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Sladenia | Ericales | Mabberley (2008) | Sladeniaceae. | ICBN |
| Sleighophrys | Haptorida | Lynn (2008) | . | ICZN |
| Slendrorhynchus | Echinorhynchida | Amin & Sey (1996) | Diplosentidae. | ICZN |
| Sleumeria | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Sleumerodendron | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Sloanea | Oxalidales | Mabberley (2008) | Elaeocarpaceae. | ICBN |
| Smallanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Smaragdicoccus | Corynebacteriales | Adachi et al. (2007); Ludwig et al. (2012) | . | ICNB |
| Smeathmannia | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Smelophyllum | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Smelowskia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Smenospongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Smicrornis | Passeriformes | Clements (2007) | . | ICZN |
| Smicrostigma | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Smilax | Liliales | Mabberley (2008) | Smilacaceae. | ICBN |
| Smilisca | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Sminthea | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Sminthopsis | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Smirnowia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Smithella | Syntrophobacterales | Garrity et al. (2005) | . | ICNB |
| Smithia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Smithiantha | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Smithora | Erythropeltidales | Schneider & Wynne (2007) | . | ICBN |
| Smithorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Smithornis | Passeriformes | Clements (2007) | . | ICZN |
| Smithsonia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Smitinandia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Smodingium | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Smutsia | Pholidota | McKenna & Bell (1997); Schlitter (2005) | Later synonym of Manis. | ICZN |
| Smutsornis | Charadriiformes | Clements (2007) | . | ICZN |
| Smyrniopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Smyrnium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Smythea | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Sneathia | Fusobacteriales | Garrity et al. (2005) | . | ICNB |
| Sneathiella | Sneathiellales | Jordan et al. (2007); Kurahashi et al. (2008) | . | ICNB |
| Snowdenia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Snowella | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Snowornis | Passeriformes | Clements (2007) | . | ICZN |
| Snuella | Flavobacteriales | Yi & Chun (2011) | . | ICNB |
| Snyderella | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Soaresia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sobennikoffia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sobolewskia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sobralia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Socotrella | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Socratea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Socratina | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Sodalis | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Soehngenia | Clostridiales | Parshina et al. (2003) | . | ICNB |
| Soejatmia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Soemmeringia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Soestia | Salpida | Kott (1998); van der Land (2001) | Replacement name for Iasis Lahille 1890. | ICZN |
| Sogerianthe | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Sohnsia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sokolovia | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Solanderia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Solandra | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Solanecio | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Solanum | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Solaria | Asparagales | Mabberley (2008) | Alliaceae. | ICBN |
| Solasteractis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Soldanella | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Soleirolia | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Solena | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Solenangis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Solenanthus | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Solenastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Soleneiscus | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Solenicola | | Gómez et al. (2011) | Domain Eucarya - Kingdom Straminipila. Clade Solenicolida. | ICZN |
| Solenidiopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Solenidium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Solenocaulon | Alcyonacea | Bayer (1981) | Anthothelidae. | ICZN |
| Solenocentrum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Solenodinium | Syndinida | Fensome et al. (1993) | . | ICZN |
| Solenodon | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Solenofilomorpha | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Solenogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Solenomelus | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Solenophora | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Solenophrya | Endogenida | Lynn (2008) | . | ICZN |
| Solenopsis | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Solenosmilia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Solenostemma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Solenostoma | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Solentia | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Solfia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Solibacillus | Bacillales | Krishnamurthi et al. (2009) | . | ICNB |
| Solidago | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Solidaster | Asterales | Mabberley (2008) | xSolidaster. Slidago x Aster hybrids. Compositae. | ICBN |
| Solidosagitta | Aphragmophora | Bieri (1991) | Sagittidae. | ICZN |
| Solieria | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Soliformovum | Protosteliales | Spiegel et al. (1994) | . | ICBN |
| Solimonas | Xanthomonadales | Kim et al. (2007) | . | ICNB |
| Solirubrobacter | Solirubrobacterales | Garrity et al. (2005); Reddy & Garcia-Pichel (2009); Ludwig et al. (2012) | . | ICNB |
| Solisorex | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Solisphaera | Coccolithales | Bollmann et al. (2006) | Former Syracosphaerales, and related to Rhabdosphaeraceae ?. | ICBN |
| Solitalea | Sphingobacteriales | Weon et al. (2009) | . | ICNB |
| Soliva | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sollasella | Hadromerida | Van Soest (2002) | . | ICZN |
| Solmaris | Narcomedusae | Bouillon et al. (2006) | . | ICZN |
| Solmissus | Narcomedusae | Bouillon et al. (2006) | . | ICZN |
| Solmsia | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Solmsiella | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Solms-laubachia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Solmundella | Narcomedusae | Bouillon et al. (2006) | . | ICZN |
| Solobacterium | Erysipelotrichales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Solomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Solonia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Solumitrus | Schizopyrenida | Anderson et al. (2011) | . | ICZN |
| Somateria | Anseriformes | Clements (2007) | . | ICZN |
| Sommera | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sommerfeltia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sommeromys | Rodentia | Musser & Carleton (2005) | . | ICZN |
| Sommerstorffia | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Sommieria | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Somniosus | Squaliformes | Nelson (2006) | . | ICZN |
| Somuncuria | Anura | Vitt & Caldwell (2009) | Leiuperidae. | ICZN |
| Sonchus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sonderella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sonderia | Plagiopylida | Lynn (2008) | . | ICZN |
| Sonderiella | Plagiopylida | Lynn (2008) | . | ICZN |
| Sonderina | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sonderopelta | Peyssonneliales | Schneider & Wynne (2007); Krayesky et al. (2009) | . | ICBN |
| Sonderothamnus | Myrtales | Mabberley (2008) | Crypteroniaceae. | ICBN |
| Sondottia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sonerila | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Songophrya | Haptorida | Lynn (2008) | . | ICZN |
| Sonneratia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Sonora | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Sooglossus | Anura | Vitt & Caldwell (2009) | Sooglossidae. | ICZN |
| Soonwooa | Flavobacteriales | Joung et al. (2010) | . | ICNB |
| Sophora | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sophronanthe | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Sophronitis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sopubia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Soracineta | Endogenida | Lynn (2008) | . | ICZN |
| Sorangium | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Sorapilla | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sorbaria | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Sorbera | Aspiraculata | Monniot & Monniot (1990); Kott (1998); Monniot (2001) | Junior synonym of Oligotrema. | ICZN |
| Sorbus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Sordellina | Squamata | Mattison (2007); Vitt & Caldwell (2009) | Serpentes. "Colubridae." Not "Sordellinia". | ICZN |
| Sorella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sorellocolax | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sorex | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Sorghastrum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sorghum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Soriculus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Soridium | Pandanales | Mabberley (2008) | Triuridaceae. | ICBN |
| Sorindeia | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Sorites | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Soritidae. | ICZN |
| Sorocea | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Sorodiplophrys | | Dick (2001); Kirk et al. (2008) | Domain Eucarya - Kingdom Straminipila - Phylum Labyrinthulomycota. | ICBN |
| Sorodiscus | Plasmodiophorida | Cavalier-Smith (1993); Kirk et al. (2008) | . | ICZN |
| Sorogena | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Soroseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sorosphaera | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Psammosphaeridae. | ICZN |
| Sorosphaera | Plasmodiophorida | Cavalier-Smith (1993); Kirk et al. (2008); Neuhauser & Kirchmair (2011) | Junior homonym. Replaced by Sorosphaerula. | ICZN |
| Sorosphaerula | Plasmodiophorida | Cavalier-Smith (1993); Kirk et al. (2008); Neuhauser & Kirchmair (2011) | Replacement name for Sorosphaera. | ICZN |
| Sotalia | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Soterosanthus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Soulamea | Sapindales | Mabberley (2008) | Simaroubaceae. | ICBN |
| Souroubea | Ericales | Mabberley (2008) | Marcgraviaceae. | ICBN |
| Sousa | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Southbya | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Southwellina | Polymorphida | Amin (1985) | . | ICZN |
| Sowerbaea | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Soyauxia | Saxifragales | Mabberley (2008) | Peridiscaceae. | ICBN |
| Soymida | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Spachea | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Spadella | Phragmophora | Bieri (1991) | Spadellidae. | ICZN |
| Spalacopus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Spalax | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Spalerosophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Spananthe | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Spaniopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Spanioplon | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Sparattanthelium | Laurales | Mabberley (2008) | Hernandiaceae. | ICBN |
| Sparattosperma | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Sparattosyce | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Sparaxis | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Sparganium | Poales | Mabberley (2008) | Sparganiaceae. | ICBN |
| Sparganophorus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sparlingia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Sparrmannia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Spartidium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Spartina | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Spartium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Spartochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Spartonoica | Passeriformes | Clements (2007) | . | ICZN |
| Spartothamnella | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Spasmostoma | Haptorida | Lynn (2008) | . | ICZN |
| Spatalla | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Spathacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Spathandra | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Spathantheum | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Spathanthus | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Spathelia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Spathia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Spathicarpa | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Spathichlamys | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Spathidiodes | Haptorida | Lynn (2008) | . | ICZN |
| Spathidioides | Haptorida | Lynn (2008) | . | ICZN |
| Spathidiopsis | Prorodontida | Lynn (2008) | . | ICZN |
| Spathidiosus | Haptorida | Lynn (2008) | . | ICZN |
| Spathidium | Haptorida | Lynn (2008) | . | ICZN |
| Spathionema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Spathiostemon | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Spathiphyllum | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Spathodea | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Spathoglottis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Spatholirion | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Spatholobus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Spatulodinium | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Spea | Anura | Vitt & Caldwell (2009) | Scaphiopodidae. | ICZN |
| Speculipastor | Passeriformes | Clements (2007) | . | ICZN |
| Speea | Asparagales | Mabberley (2008) | Alliaceae. | ICBN |
| Spegazziniophytum | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Speirantha | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Speirops | Passeriformes | Clements (2007) | . | ICZN |
| Spelaeanthus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Spelaeomys | Rodentia | Musser & Carleton (2005) | Recently extinct. | ICZN |
| Spelaeophrya | Exogenida | Lynn (2008) | . | ICZN |
| Spelaeophryne | Anura | Vitt & Caldwell (2009) | Brevicipitidae. | ICZN |
| Spelaeopogon | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Spelaeornis | Passeriformes | Clements (2007) | . | ICZN |
| Speleoperipatus | Euonychophora | Peck (1975) | Peripatidae. | ICZN |
| Speleoscyphidia | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Spencerella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spenceria | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Spengelia | Helminthomorpha | Benito (1982) | Spengelidae. | ICZN |
| Speothos | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Speranskia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Spergula | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Spergularia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Spermacoce | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Spermadictyon | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Spermatobium | Piroplasmorida | Perkins et al. (2000) | . | ICZN |
| Spermestes | Passeriformes | Clements (2007) | . | ICZN |
| Spermolepis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Spermophaga | Passeriformes | Clements (2007) | . | ICZN |
| Spermophilopsis | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Spermophilus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Spermothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spetaea | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Spetazoon | Haptorida | Lynn (2008) | . | ICZN |
| Sphacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sphaenolobium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sphaenorhynchus | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Sphaeracineta | Endogenida | Lynn (2008) | . | ICZN |
| Sphaeradenia | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Sphaeralcea | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Sphaeralgalma | Siphonophorae | Bouillon et al. (2006) | invalid name. | ICZN |
| Sphaerammina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Sphaeramminidae. | ICZN |
| Sphaeranthula | Ceriantharia | Tiffon (1987) | . | ICZN |
| Sphaeranthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sphaerantia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Sphaeraspis | | Kristiansen & Preisig (2001) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta. | ICBN |
| Sphaerastrum | Pterocystida | Mikrjukov et al. (2000); Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Heterophryidae. | ICZN |
| Sphaerechinorhynchus | Polymorphida | Amin (1985) | . | ICZN |
| Sphaereupatorium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sphaerias | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Sphaeridia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992); Özdikmen (2009) | Junior homonym. Substituted by Kuremsia. | ICZN |
| Sphaeridiothrix | Phaeothamniales | Bailey et al. (1998) | . | ICBN |
| Sphaeripara | Syndinida | Fensome et al. (1993) | . | ICZN |
| Sphaerirostris | Polymorphida | Amin (1985) | . | ICZN |
| Sphaerisporangium | Streptosporangiales | Ara & Kudo (2007); Ludwig et al. (2012) | . | ICNB |
| Sphaerita | Rozellopsidales | Dick (2001); Kirk et al. (2008) | Pseudosphaeritaceae. | ICBN |
| Sphaerobacter | Sphaerobacterales | Garrity et al. (2005) | . | ICNB |
| Sphaerobactrum | Haptorida | Lynn (2008) | . | ICZN |
| Sphaerobambos | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sphaerobryon | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (biflagellate). | ICBN |
| Sphaerocalyptra | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Sphaerocardamum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Sphaerocarpos | Sphaerocarpales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sphaerocaryum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sphaerocavum | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Sphaerochaeta | Spirochaetale | Ritalahti et al. (2012) | . | ICNB |
| Sphaerococcus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Sphaerocodon | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Sphaerocoma | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Sphaerocoryne | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Sphaerocyperus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Sphaerocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Sphaerodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Sphaeroeca | Craspedida | Leadbeater & Thomsen (2000) | . | ICZN |
| Sphaeroforma | Ichthyophonida | Jøstensen et al. (2002) | . | ICZN |
| Sphaerogypsina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Acervulinidae. | ICZN |
| Sphaeroidina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Sphaeroidinidae. | ICZN |
| Sphaeroidinella | Globigerinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Globigerinidae. | ICZN |
| Sphaerolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sphaerolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sphaeromorphaea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sphaeromyxa | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Sphaeronectes | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Sphaeronycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Sphaerophrya | Exogenida | Lynn (2008) | . | ICZN |
| Sphaerophysa | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sphaeropteris | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Sphaerorhynchus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Sphaerosacme | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Sphaerosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sphaerosorus | Mischococcales | Ettl (1978) | . | ICBN |
| Sphaerospermopsis | Nostocales | Zapomĕlová et al. (2010) | New name for Sphaerospermum. | ICBN |
| Sphaerospermum | Nostocales | Zapomĕlová et al. (2009); Zapomĕlová et al. (2010) | Later homonym. Replaced by Sphaerospermopsis. | ICBN |
| Sphaerospora | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Sphaerosporangium | Streptosporangiales | Ara & Kudo (2007) | Incorrect spelling of Sphaerisporangium. | ICNB |
| Sphaerosporoceros | Anthocerotales | Renzaglia et al. (2009) | . | ICBN |
| Sphaerostylis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Sphaerotheca | Anura | Vitt & Caldwell (2009) | Dicroglossidae. | ICZN |
| Sphaerotheciella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Sphaerothecium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Sphaerothecum | Dermocystida | Arkush et al. (2003) | . | ICZN |
| Sphaerothylax | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Sphaerotilus | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Sphaerotylus | Hadromerida | Boury-Esnault (2002) | . | ICZN |
| Sphaerozosma | Desmidiales | Gontcharov (2008) | . | ICBN |
| Sphaerozoum | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Sphagneticola | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Sphagnoikos | Tribonematales | Ettl (1978); Silva (1979) | Substitute name for Fremya. | ICBN |
| Sphagnum | Sphagnales | Goffinet et al. (2009) | . | ICBN |
| Sphairogullmia | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Sphaleromantis | Chromulinales | Kristiansen & Preisig (2001) | Chromulinaceae (uniflagellate). | ICBN |
| Sphallerocarpus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Sphalmium | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Spheciospongia | Hadromerida | Rützler (2002) | . | ICZN |
| Sphecotheres | Passeriformes | Clements (2007) | . | ICZN |
| Sphedamnocarpus | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Spheneria | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Spheniscus | Sphenisciformes | Clements (2007) | . | ICZN |
| Sphenocentrum | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Sphenocichla | Passeriformes | Clements (2007) | . | ICZN |
| Sphenoclea | Solanales | Mabberley (2008) | Sphenocleaceae. | ICBN |
| Sphenoderes | Cyclorhagida | Higgins (1990) | . | ICZN |
| Sphenoderia | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Sphenodesme | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Sphenodon | Sphenodontia | Vitt & Caldwell (2009) | Sphenodontidae. | ICZN |
| Sphenoeacus | Passeriformes | Clements (2007) | . | ICZN |
| Sphenolobopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sphenolobus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sphenomeris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Sphenomonas | Sphenomonadales | Leedale (1967); Leedale (2000) | . | ICBN |
| Sphenomorphus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Sphenoparme | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Sphenopholis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sphenophrya | Rhynchodida | Lynn (2008) | . | ICZN |
| Sphenophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Sphenops | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Sphenopus | Zoanthidea | Sinniger et al. (2005) | . | ICZN |
| Sphenopus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sphenostemon | Paracryphiales | Mabberley (2008) | Paracryphiaceae. | ICBN |
| Sphenostomella | Philasterida | Lynn (2008) | . | ICZN |
| Sphenostylis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sphenotoma | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Sphenotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Spheractis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Spherospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Sphiggurus | Rodentia | Woods & Kilpatrick (2005) | . | ICZN |
| Sphinctacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Sphinctanthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Sphinctospermum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sphinga | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sphingiphila | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Sphingobacterium | Sphingobacteriales | Garrity et al. (2005) | . | ICNB |
| Sphingobium | Sphingomonadales | Garrity et al. (2005) | . | ICNB |
| Sphingomicrobium | Sphingomonadales | Kämpfer et al. (2012) | . | ICNB |
| Sphingomonas | Sphingomonadales | Garrity et al. (2005) | . | ICNB |
| Sphingopyxis | Sphingomonadales | Garrity et al. (2005) | . | ICNB |
| Sphingosinicella | Sphingomonadales | Maruyama et al. (2006) | . | ICNB |
| Sphondylothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sphyranthera | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Sphyrapicus | Piciformes | Clements (2007) | . | ICZN |
| Sphyrarhynchus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sphyrias | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Sphyrna | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Sphyrospermum | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Spicospina | Anura | Vitt & Caldwell (2009) | Myobatrachidae. | ICZN |
| Spiculaea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Spiculidendron | Astrorhizida | Kaminski (2004) | Dendrophryidae, Astrorhizacea. | ICZN |
| Spiculosiphon | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Psammosphaeridae. | ICZN |
| Spigelia | Gentianales | Mabberley (2008) | Loganiaceae. | ICBN |
| Spilanthes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Spilocuscus | Diprotodontia | Groves (2005) | . | ICZN |
| Spilogale | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Spiloptila | Passeriformes | Clements (2007) | . | ICZN |
| Spilornis | Falconiformes | Clements (2007) | . | ICZN |
| Spilotes | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Spiloxene | Asparagales | Mabberley (2008) | Hypoxidaceae. | ICBN |
| Spinacia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Spinactinospora | Streptosporangiales | Chang et al. (2011); Ludwig et al. (2012) | Nocardiopsaceae. | ICNB |
| Spinarcon | Exogenida | Lynn (2008) | . | ICZN |
| Spincterules | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Spindalis | Passeriformes | Clements (2007) | . | ICZN |
| Spinichona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Spiniferodinium | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Spiniferomonas | Paraphysomonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Paraphysomonadaceae. | ICBN |
| Spinifex | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Spinispora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Spinivorticella | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Spinochordodes | Gordioidea | Schmidt-Rhaesa (2002); Poinar Jr. (2008) | . | ICZN |
| Spinoclosterium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Spinocosmarium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Spinoeca | Acanthoecida | Nitsche et al. (2011) | . | ICZN |
| Spinoloricus | Nanaloricida | Heiner & Kristensen (2009) | . | ICZN |
| Spinomantis | Anura | Vitt & Caldwell (2009) | Mantellidae. | ICZN |
| Spinospongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Spinularia | Hadromerida | Boury-Esnault (2002) | . | ICZN |
| Spiracantha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Spiracanthus | Echinorhynchida | Muñoz & George-Nascimento (2002) | Arhythmacanthidae. | ICZN |
| Spiradiclis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Spiraea | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Spiraeanthemum | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Spiraeanthus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Spiraeopsis | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Spiraloecion | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Spiranthera | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Spiranthes | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Spirasigma | Spirophorida | Hooper & Van Soest (2002) | . | ICZN |
| Spirastrella | Hadromerida | Rützler (2002) | . | ICZN |
| Spiraulax | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Spirella | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Spiridens | Hypnodendrales | Goffinet et al. (2009) | . | ICBN |
| Spiridentopsis | Hypnales | Greuter et al. (1993); Goffinet et al. (2009) | Not "Spriridentopsis". | ICBN |
| Spirillina | Spirillinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spirillinidae. | ICZN |
| Spirillinoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ammodiscidae. | ICZN |
| Spirilliplanes | Micromonosporales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Spirillospora | Streptosporangiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Spirillum | Nitrosomonadales | Garrity et al. (2005) | . | ICNB |
| Spirirestis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Spiroamphisiella | Stichotrichida | Li et al. (2007) | . | ICZN |
| Spirobuetschliella | Astomatida | Lynn (2008) | . | ICZN |
| Spirochaeta | Spirochaetales | Garrity et al. (2005) | . | ICNB |
| Spirochona | Exogemmida | Lynn (2008) | . | ICZN |
| Spirocladia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spirocochlearia | Peritrichida | Lynn (2008); Zhan et al. (2009) | Nomen nudum. | ICZN |
| Spirocodon | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Spirocoleus | Pseudanabaenales | Hoffmann et al. (2005) | . | ICBN |
| Spirocorys | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Spirocyrtis | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Spirocystis | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Spirocystonella | Tintinnida | Lynn (2008) | . | ICZN |
| Spirocytopharynx | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Spirodela | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Spirodinium | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Spirofilopsis | Stichotrichida | Lynn (2008) | . | ICZN |
| Spirogardnera | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Spirogyra | Zygnematales | Gontcharov (2008) | . | ICBN |
| Spirolina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Peneroplidae. | ICZN |
| Spirolingulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Spirolobium | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Spirolocammina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rzehakinidae. | ICZN |
| Spiroloculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroloculinidae. | ICZN |
| Spiromastigotes | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Spironema | Hemimastigida | Cavalier-Smith (1993) | . | ICZN |
| Spironucleus | Diplomonadida | Brugerolle & Lee (2000) | . | ICZN |
| Spironympha | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Spiroperistomatus | Clevelandellida | Lynn (2008) | . | ICZN |
| Spirophrya | Apostomatida | Lynn (2008) | . | ICZN |
| Spirophthalmidium | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ophthalmidiidae. | ICZN |
| Spirophycus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spiroplasma | Entomoplasmatales | Garrity et al. (2005) | . | ICNB |
| Spiroplectammina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroplectamminidae. | ICZN |
| Spiroplectella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroplectamminidae. | ICZN |
| Spiroplectinella | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroplectamminidae. | ICZN |
| Spirorbina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rosalinidae. | ICZN |
| Spirorhabdia | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Spirorhynchus | Armophorida | Lynn (2008) | Later synonym of Metopus?. | ICZN |
| Spirorhynchus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Spirorutilus | Texturiina | Kaminski (2000) | Textulariacea. | ICZN |
| Spiroseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Spirosoma | Cytophagales | Garrity et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Spirospermum | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Spirostachys | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Spirostigma | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Spirostomum | Heterotrichida | Lynn (2008) | . | ICZN |
| Spirostrombidium | Strombidiida | Lynn (2008) | . | ICZN |
| Spirosuturia | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Spirotaenia | Zygnematales | Gontcharov & Melkonian (2004); Gontcharov (2008) | Possibly closely related to Chlorokybales. | ICBN |
| Spirotecoma | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Spirotectina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spirotectinidae. | ICZN |
| Spirotextularia | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroplectamminidae. | ICZN |
| Spirotheca | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Spirotontonia | Strombidiida | Lynn (2008) | . | ICZN |
| Spirotrachelostyla | Sporadotrichida | Lynn (2008) | . | ICZN |
| Spirotrichonympha | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Spirotrichonymphella | Spirotrichonymphida | Cepicka et al. (2010) | . | ICZN |
| Spirotrichosoma | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Spirotropis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Spiroxya | Hadromerida | Rützler (2002) | . | ICZN |
| Spirozona | Tetrahymenida | Lynn (2008) | . | ICZN |
| Spirulina | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Spiza | Passeriformes | Clements (2007) | . | ICZN |
| Spizaetus | Falconiformes | Clements (2007) | . | ICZN |
| Spizastur | Falconiformes | Clements (2007) | . | ICZN |
| Spizella | Passeriformes | Clements (2007) | . | ICZN |
| Spiziapteryx | Falconiformes | Clements (2007) | . | ICZN |
| Spizixos | Passeriformes | Clements (2007) | . | ICZN |
| Spizocorys | Passeriformes | Clements (2007) | . | ICZN |
| Splachnobryum | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Splachnum | Splachnales | Goffinet et al. (2009) | . | ICBN |
| Splitofolliculina | Heterotrichida | Lynn (2008) | nomen nudum. | ICZN |
| Spodiopogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Spondianthus | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Spondias | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Spondylosium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Spongaster | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Spongiarcon | Exogenida | Lynn (2008) | . | ICZN |
| Spongiibacter | | Graeber et al. (2008) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. | ICNB |
| Spongiibacterium | Flavobacteriales | Yoon & Oh (2012) | . | ICNB |
| Spongiispira | Oceanospirillales | Kaesler et al. (2008) | . | ICNB |
| Spongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Spongiocarpella | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Spongiola | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Spongionella | Dendroceratida | Bergquist & Cook (2002) | . | ICZN |
| Spongiosperma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Spongites | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Spongoclonium | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spongocore | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongodes | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Spongodiscus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongoliva | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongomonas | Spongomonadida | Cavalier-Smith (2000); Cavalier-Smith & Chao (2003) | . | ICZN |
| Spongophloea | Cryptonemiales | Huisman et al. (2010) | . | ICBN |
| Spongoplegma | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongopyle | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongosorites | Halichondrida | Erpenbeck & Van Soest (2002) | . | ICZN |
| Spongosphaera | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongospora | Plasmodiophorida | Cavalier-Smith (1993); Kirk et al. (2008) | . | ICZN |
| Spongotrochus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Spongurus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Sporacetigenium | Clostridiales | Chen et al. (2006) | . | ICNB |
| Sporadanthus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Sporadogenerina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Polymorphinidae. | ICZN |
| Sporadopora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Sporadotrema | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Homotrematidae. | ICZN |
| Sporaeginthus | Passeriformes | Clements (2007) | . | ICZN |
| Sporanaerobacter | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Sporichthya | Frankiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Sporobacter | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Sporobacterium | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Sporobolus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sporocytophaga | Cytophagales | Garrity et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Sporoglossum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sporohalobacter | Halanaerobiales | Garrity et al. (2005) | . | ICNB |
| Sporolactobacillus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Sporolithon | Sporolithales | Schneider & Wynne (2007); Le Gall et al. (2010) | . | ICBN |
| Sporolituus | Selenomonadales | Ogg & Patel (2009); Marchandin et al. (2010) | . | ICNB |
| Sporomusa | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Sporomyxa | Plasmodiophorida | Kirk et al. (2008) | . | ICZN |
| Sporophila | Passeriformes | Clements (2007) | . | ICZN |
| Sporopipes | Passeriformes | Clements (2007) | . | ICZN |
| Sporosalibacterium | Clostridiales | Rezgui et al. (2011) | . | ICNB |
| Sporosarcina | Bacillales | Garrity et al. (2005) | . | ICNB |
| Sporotalea | Selenomonadales | Boga et al. (2007); Marchandin et al. (2010); Moe et al. (2012) | Later synonym of Pelosinus. | ICNB |
| Sporotomaculum | Clostridiales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Sporoxeia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Spraguea | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Spragueanella | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Sprekelia | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Sprengelia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Spreo | Passeriformes | Clements (2007) | . | ICZN |
| Spruceanthus | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Sprucella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Spryginia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Spumella | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Spumochlamys | Arcellinida | Kudryavtsev & Hausmann (2007) | Microchlamyiidae. | ICZN |
| Spuriodaucus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Spyractis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Spyridia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spyridiocolax | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Spyridium | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Squaliolus | Squaliformes | Nelson (2006) | . | ICZN |
| Squalorophrya | Endogenida | Lynn (2008) | . | ICZN |
| Squalus | Squaliformes | Nelson (2006) | . | ICZN |
| Squamellaria | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Squamidium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Squamopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Squamulina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Squamulinidae. | ICZN |
| Squatina | Squatiniformes | Nelson (2006) | . | ICZN |
| Squatinella | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Srilankamys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Staavia | Bruniales | Mabberley (2008) | Bruniaceae. | ICBN |
| Staberoha | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Stachyamoeba | Schizopyrenida | Patterson et al. (2000) | . | ICZN |
| Stachyanthus | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Stachyarrhena | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stachycephalum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stachydeoma | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Stachyococcus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stachyopsis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Stachyothyrsus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stachyphrynium | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Stachyptilum | Pennatulacea | Williams (1995) | . | ICZN |
| Stachyris | Passeriformes | Clements (2007) | . | ICZN |
| Stachys | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Stachystemon | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Stachytarpheta | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Stachyurus | Crossosomatales | Mabberley (2008) | Stachyuraceae. | ICBN |
| Stackebrandtia | Glycomycetales | Labeda & Kroppenstedt (2005); Ludwig et al. (2012) | . | ICNB |
| Stackhousia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Stactolaema | Piciformes | Clements (2007) | . | ICZN |
| Stadiochilus | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Stadmania | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Staehelina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Staelia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stagonopleura | Passeriformes | Clements (2007) | . | ICZN |
| Stahlia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stainforthia | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Stainforthiidae. | ICZN |
| Stakelama | Sphingomonadales | Chen et al. (2010) | . | ICNB |
| Staleya | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Stalkya | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stammeridium | Microthoracida | Lynn (2008) | . | ICZN |
| Standleya | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Standleyanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stanfieldiella | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Stangeria | Cycadales | Mabberley (2008); Christenhusz et al. (2011) | . | ICBN |
| Stanhopea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stanierella | Flavobacteriales | Nedashkovskaya et al. (2005); Nedashkovskaya et al. (2006) | Later synonym of Aquimarina. | ICNB |
| Stanieria | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Stanleya | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Stanmarkia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Stannoma | Stannomida | Gooday & Tendal (2000) | . | ICZN |
| Stannophyllum | Stannomida | Gooday & Tendal (2000) | . | ICZN |
| Stapelia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stapelianthus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stapfiella | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Staphylea | Crossosomatales | Mabberley (2008) | Staphyleaceae. | ICBN |
| Staphylococcus | Bacillales | Garrity et al. (2005) | . | ICNB |
| Staphylothermus | Desulfurococcales | Garrity et al. (2005) | . | ICNB |
| Stappia | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Starkeya | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Starnoenas | Columbiformes | Clements (2007) | . | ICZN |
| Starobogatovella | Textulariida | Kaminski (2000) | Ammoscalariidae, Lituolacea. | ICZN |
| Starria | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Staszicella | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Stathmostelma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Statolitonemertes | Palaeonemertea | Gibson (1995) | . | ICZN |
| Staudtia | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Stauntonia | Ranunculales | Mabberley (2008) | Lardizabalaceae. | ICBN |
| Stauracantha | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Stauracanthus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stauracon | Chaunacanthida | Febvre et al. (2000) | . | ICZN |
| Stauractis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stauraglaura | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Stauranthera | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Stauranthus | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Stauraspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Staurastrum | Desmidiales | Gontcharov (2008) | . | ICBN |
| Staurochlamys | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Staurocladia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Staurodesmus | Desmidiales | Gontcharov (2008) | . | ICBN |
| Staurodiscus | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Staurogyne | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Staurois | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Staurojoenina | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Staurolonche | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Stauromatonema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Stauropathes | Antipatharia | Opresko (2002) | . | ICZN |
| Staurophora | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Staurophrya | Endogenida | Lynn (2008) | . | ICZN |
| Staurotheca | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Staurotypus | Testudinata | Vitt & Caldwell (2009) | Dermatemydidae. | ICZN |
| Stawellia | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Stayneria | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Steatomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Steatornis | Caprimulgiformes | Clements (2007) | . | ICZN |
| Stebbinsoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Steenisia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Steenstrupiella | Tintinnida | Lynn (2008) | . | ICZN |
| Steereella | Metzgeriales | Crandall-Stotler et al. (2009) | . | ICBN |
| Steereobryon | Polytrichales | Greuter et al. (1993); Goffinet et al. (2009) | Not "Stereobryon" (Greuter et al., 1993). | ICBN |
| Stefania | Anura | Vitt & Caldwell (2009) | Cryptobatrachidae. | ICZN |
| Stefanoffia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Steganorhynchus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Steganotaenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Steganthera | Laurales | Mabberley (2008) | Monimiaceae. | ICBN |
| Stegella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Stegengaea | Ceramiales | Wynne & Schneider (2010) | . | ICBN |
| Stegnosperma | Caryophyllales | Mabberley (2008) | Stegnospermataceae. | ICBN |
| Stegochilum | Tetrahymenida | Lynn (2008) | . | ICZN |
| Stegolaria | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Stegolepis | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Stegonia | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Stegonotus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Stegopoma | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Stegosoma | Appendicularia | Fenaux (1998) | . | ICZN |
| Stegostoma | Orectolobiformes | Nelson (2006) | . | ICZN |
| Stegotricha | Rhynchodida | Lynn (2008) | . | ICZN |
| Steigerina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Steinchisma | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Steinella | Astomatida | Lynn (2008) | . | ICZN |
| Steinhausia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Steinia | Sporadotrichida | Lynn (2008) | . | ICZN |
| Steinina | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Steirachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Steiractinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Steirodiscus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stelechantha | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stelechocarpus | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Stelestylis | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Stelexomonas | Craspedida | Leadbeater & Thomsen (2000) | . | ICZN |
| Stelgidopteryx | Passeriformes | Clements (2007) | . | ICZN |
| Stelidiella | Tintinnida | Lynn (2008) | . | ICZN |
| Stelis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stella | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Stelladinium | Peridiniales | Fensome et al. (1993) | Holocene. | ICBN |
| Stellapora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Stellaria | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Stellera | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Stelletta | Astrophorida | Uriz (2002) | . | ICZN |
| Stelligera | Hadromerida | Hooper (2002) | . | ICZN |
| Stellilabium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stellitethya | Hadromerida | Sarà (2002) | . | ICZN |
| Stellula | Apodiformes | Clements (2007) | . | ICZN |
| Stelmacrypton | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stelmagonum | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stelodoryx | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Stemmadenia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stemodia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Stemodiopsis | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Stemona | Pandanales | Mabberley (2008) | Stemonaceae. | ICBN |
| Stemonaria | Stemonitales | Yamamoto (1998) | . | ICBN |
| Stemonitis | Stemonitales | Yamamoto (1998) | . | ICBN |
| Stemonitopsis | Stemonitales | Yamamoto (1998) | . | ICBN |
| Stemonocoleus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stemonoporus | Malvales | Mabberley (2008) | Dipterocarpaceae. | ICBN |
| Stemonurus | Aquifoliales | Mabberley (2008) | Stemonuraceae. | ICBN |
| Stempellia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Stenachaenium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenamoeba | Thecamoebida | Smirnov et al. (2007); Tekle et al. (2008); Smirnov et al. (2011) | . | ICZN |
| Stenandrium | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Stenanona | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Stenanthemum | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Stenanthium | Liliales | Mabberley (2008) | Melanthiaceae. | ICBN |
| Stenaria | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stenella | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Stenia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Steno | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Stenocactus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Stenocarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenocarpidiopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Stenocarpidium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Stenocarpus | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Stenocephalemys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Stenocephalum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenocercus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Stenocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Stenochlaena | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Stenocline | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenocodon | Jakobida | Patterson et al. (2000) | . | ICZN |
| Stenocodon | | Kristiansen & Preisig (2001) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta. | ICBN |
| Stenocoelium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Stenocyathus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Stenodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Stenoderma | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Stenodesmus | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Stenodictyon | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Stenodon | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Stenodrepanum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stenoductus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Stenoglottis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stenogonum | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Stenogramma | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Stenogyne | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Stenohelia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Stenolejeunea | Porellales | Crandall-Stotler et al. (2009); Sönderström et al. (2010) | Later synonym of Lejeunea. | ICBN |
| Stenolepia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Stenolepis | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Stenomeria | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stenomesson | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Stenomys | Rodentia | McKenna & Bell (1997); Musser & Carleton (2005) | Later synonym of Rattus. | ICZN |
| Stenopadus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenopeltis | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Stenopetalum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Stenophalium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Stenophora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Stenops | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenoptera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stenorrhina | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Stenorrhipis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Stenorrhynchos | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stenoscyphus | Stauromedusae | Kramp (1961) | . | ICZN |
| Stenosemella | Tintinnida | Lynn (2008) | . | ICZN |
| Stenosemis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Stenosepala | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stenoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenosolenium | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Stenospermation | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Stenostegia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Stenostelma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stenostephanus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Stenostira | Passeriformes | Clements (2007) | . | ICZN |
| Stenotaenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Stenotalis | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Stenotaphrum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Stenotheciopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Stenothermobacter | Flavobacteriales | Lau et al. (2006) | . | ICNB |
| Stenothyrsus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Stenotricha | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Spirotrichea - Subclass Stichotrichia. | ICZN |
| Stenotrophomonas | Xanthomonadales | Garrity et al. (2005) | . | ICNB |
| Stenotus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stenoxybacter | Neisseriales | Wertz & Breznak (2007) | . | ICNB |
| Stentofolliculina | Heterotrichida | Lynn (2008) | . | ICZN |
| Stentor | Heterotrichida | Lynn (2008) | . | ICZN |
| Stentoropsis | Heterotrichida | Lynn (2008) | . | ICZN |
| Stepanjantsia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Stephalia | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Stephanacantha | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Stephanachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Stephanactis | Actiniaria | Fautin et al. (2007) | Junior homonym. Replaced by Stephanauge. | ICZN |
| Stephanactis | Actiniaria | Fautin et al. (2007) | Senior homonym. | ICZN |
| Stephanandra | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Stephanauge | Actiniaria | Fautin et al. (2007) | Replacement name for Stephanactis. | ICZN |
| Stephania | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Stephaniella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Stephaniellidium | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Stephanoaetus | Falconiformes | Clements (2007) | . | ICZN |
| Stephanocaryum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Stephanocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Stephanoceros | Collothecaceae | Segers (2002); Segers (2007) | . | ICZN |
| Stephanococcus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stephanocoenia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Stephanocyathus | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Stephanodaphne | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Stephanodoria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stephanoeca | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Stephanogorgia | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Stephanohelia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Stephanomeria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stephanonympha | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Stephanophorus | Passeriformes | Clements (2007) | . | ICZN |
| Stephanophyes | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Stephanophyllia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Stephanopodium | Malpighiales | Mabberley (2008) | Dichapetalaceae. | ICBN |
| Stephanopogon | Pseudociliatida | Cavalier-Smith (2003) | . | ICZN |
| Stephanostegia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stephanostema | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stephanothelys | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stephanoxis | Apodiformes | Clements (2007) | . | ICZN |
| Stephanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stephensonactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stephensoniella | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Stercorarius | Charadriiformes | Clements (2007) | . | ICZN |
| Sterculia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Stereobalanus | Helminthomorpha | Benito (1982) | Harrimaniidae. | ICZN |
| Stereocaryum | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Stereochilus | Caudata | Vitt & Caldwell (2009) | Plethodontidae. | ICZN |
| Stereochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stereochlaena | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Stereochlamis | Hexactinosida | Reiswig (2002) | . | ICZN |
| Stereodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Stereodontopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Stereomyxa | | Smirnov et al. (2011) | Domain Eucarya - Phylum Amoebozoa - Subphylum Lobosa; Stereomyxidae. | ICZN |
| Stereonephthya | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Stereophyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Stereosandra | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stereospermum | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Stereotheca | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Sterigmapetalum | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Sterigmostemum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Steriphoma | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Sterkiella | Sporadotrichida | Lynn (2008) | . | ICZN |
| Sterna | Charadriiformes | Clements (2007) | . | ICZN |
| Sternbergia | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Sternoclyta | Apodiformes | Clements (2007) | . | ICZN |
| Sternotherus | Testudinata | Vitt & Caldwell (2009) | Dermatemydidae. | ICZN |
| Sternula | Charadriiformes | Clements (2007) | . | ICZN |
| Steroidobacter | Xanthomonadales | Fahrbach et al. (2008) | . | ICNB |
| Sterolibacterium | Rhodocyclales | Garrity et al. (2005) | . | ICNB |
| Sterrastrolepis | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Sterreria | Nemertodermatida | Kennet (2000) | . | ICZN |
| Sterrocladia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Stetsonia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Pseudoparrellidae. | ICZN |
| Stetsonia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Stetteria | Desulfurococcales | Garrity et al. (2005) | . | ICNB |
| Steudnera | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Stevenia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Steveniella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stevensia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stevia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Steviopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stewartia | Ericales | Mabberley (2008) | Theaceae. | ICBN |
| Stewartiella | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Steyerbromelia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Steyermarkia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Steyermarkiella | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Steyermarkina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Steyermarkochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sthenonia | Semaeostomeae | Kramp (1961) | . | ICZN |
| Stiburus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Sticherus | Gleicheniales | Christenhusz et al. (2011) | . | ICBN |
| Stichianthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stichochrysis | | Kristiansen & Preisig (2001) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta. | ICBN |
| Stichococcus | Prasiolales | Neustupa et al. (2009) | As Prasiola clade. | ICBN |
| Stichodactyla | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stichogloea | Phaeothamniales | Bailey et al. (1998) | . | ICBN |
| Sticholonche | Taxopodida | Mikrjukov et al. (2000); Nikolaev et al. (2004) | . | ICZN |
| Stichoneuron | Pandanales | Mabberley (2008) | Stemonaceae. | ICBN |
| Stichopathes | Antipatharia | Bo et al. (2009) | "110608". | ICZN |
| Stichophora | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stichopilium | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Stichosiphon | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Stichothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Stichotricha | Stichotrichida | Lynn (2008) | . | ICZN |
| Stictocardia | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Stictolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Stictonetta | Anseriformes | Clements (2007) | . | ICZN |
| Stictospora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Stictosporum | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Stifftia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stigmaphyllon | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Stigmatella | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Stigmatopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Stigmatorhynchus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stigmatorthos | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stigmatura | Passeriformes | Clements (2007) | . | ICZN |
| Stigonema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Stilbanthus | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Stilbe | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Stilbocarpa | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Stillingia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Stilosoma | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Stilpnogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stilpnolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stilpnopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stilpnophyllum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stiltia | Charadriiformes | Clements (2007) | . | ICZN |
| Stimpsonia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Stipa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Stipagrostis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Stipecoma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Stiphrornis | Passeriformes | Clements (2007) | . | ICZN |
| Stipitochrysis | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Stipitococcus | Rhizochloridales | Ettl (1978) | . | ICBN |
| Stipitoporos | Rhizochloridales | Ettl (1978) | . | ICBN |
| Stipiturus | Passeriformes | Clements (2007) | . | ICZN |
| Stipulicida | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Stirlingia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Stirnia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Stirtonanthus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stixis | Brassicales | Mabberley (2008) | Excluded from Capparaceae?. | ICBN |
| Stizophyllum | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Stochomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Stocksia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Stockwellia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Stoeba | Astrophorida | Maldonado (2002) | . | ICZN |
| Stoebe | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stoeberia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Stoecharthrum | Orthonectida | Stunkard (1982); Kozloff (1992) | . | ICZN |
| Stoeckeria | Peridiniales | Jeong et al. (2005); Levy et al. (2007) | . | ICBN |
| Stoibrax | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Stokesia | Peniculida | Lynn (2008) | . | ICZN |
| Stokesia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stokesiella | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (biflagellate). | ICBN |
| Stoliczkaia | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Stolonica | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Styelidae. | ICZN |
| Stolonivector | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Stolzia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Stomatanthes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stomatium | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Stomatochaeta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stomatochone | Jakobida | Patterson et al. (2000) | . | ICZN |
| Stomatococcus | Micrococcales | Garrity et al. (2005); Busse (2012) | Later synonym of Rothia. | ICNB |
| Stomatophora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Stomatophrya | Nassulida | Lynn (2008) | . | ICZN |
| Stomatorbina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Mississippinidae. | ICZN |
| Stomatricha | Acoela | Hooge (2003); Hooge & Tyler (2005) | . | ICZN |
| Stomoloculina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Elphidiidae. | ICZN |
| Stomolophus | Rhizostomeae | Kramp (1961) | . | ICZN |
| Stomotoca | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Stomozoa | Aplousobranchia | Monniot & Monniot (1972); Kott (1998) | Stomozoidae. | ICZN |
| Stomphia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stonea | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Stoneobryum | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Stonesia | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Stonesiella | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Storckiella | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Storeatula | Pyrenomonadales | Clay et al. (1999); Novarino (2003) | . | ICBN |
| Storeria | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Storthocalyx | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Storthosphaera | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Psammosphaeridae. | ICZN |
| Stramentopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Straminergon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Strangea | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Strasburgeria | Crossosomatales | Mabberley (2008) | Strasburgeriaceae. | ICBN |
| Stratiotes | Alismatales | Mabberley (2008) | Hydrocharitaceae. | ICBN |
| Stratospongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Straussiella | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Streblacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Streblochaete | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Streblocladia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Strebloides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Discorbidae. | ICZN |
| Streblomastix | Oxymonadida | Brugerolle & Lee (2000) | . | ICZN |
| Streblorrhiza | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Streblosa | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Streblosiopsis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Streblus | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Strelitzia | Zingiberales | Mabberley (2008) | Strelitziaceae. | ICBN |
| Strelkowella | Exogenida | Lynn (2008) | . | ICZN |
| Strempeliopsis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Strepera | Passeriformes | Clements (2007) | . | ICZN |
| Strephonema | Myrtales | Mabberley (2008) | Combretaceae. | ICBN |
| Strepsichordaia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Streptacidiphilus | Streptomycetales | Kim et al. (2003); Ludwig et al. (2012) | . | ICNB |
| Streptanthella | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Streptanthus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Streptoalloteichus | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Streptobacillus | Fusobacteriales | Garrity et al. (2005) | . | ICNB |
| Streptocalypta | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Streptocalyx | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Streptocarpus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Streptocaulon | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Streptocaulus | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Streptochaeta | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Streptocitta | Passeriformes | Clements (2007) | . | ICZN |
| Streptococcus | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Streptoglossa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Streptognatha | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Streptogyna | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Streptohalobacillus | Bacillales | Wang et al. (2011) | . | ICNB |
| Streptolirion | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Streptoloma | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Streptolophus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Streptomonospora | Streptosporangiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Streptomyces | Streptomycetales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Streptonema | Desmidiales | Gontcharov (2008) | . | ICBN |
| Streptopelia | Columbiformes | Clements (2007) | . | ICZN |
| Streptopetalum | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Streptopogon | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Streptoprocne | Apodiformes | Clements (2007) | . | ICZN |
| Streptopus | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Streptosiphon | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Streptosporangium | Streptosporangiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Streptostachys | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Streptostemon | Nostocales | Sant'Anna et al. (2010) | . | ICBN |
| Streptothamnus | Berberidopsidales | Mabberley (2008) | Berberidopsidaceae. | ICBN |
| Streptotrichum | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Streptoverticillium | Streptomycetales | Garrity et al. (2005); Kämpfer (2012) | Later synonym of Streptomyces. | ICNB |
| Stresemannia | Passeriformes | Clements (2007) | . | ICZN |
| Striatospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Strictocostella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Stilostomellidae. | ICZN |
| Striga | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Strigocuscus | Diprotodontia | Groves (2005) | . | ICZN |
| Strigomonas | Trypanosomatida | Teixeira et al. (2011) | . | ICZN |
| Strigops | Psittaciformes | Clements (2007) | . | ICZN |
| Striolatus | Dactylopodida | Rogerson & Patterson (2000); Smirnov et al. (2005) | Vexilliferidae. | ICZN |
| Strix | Strigiformes | Clements (2007) | . | ICZN |
| Strobilacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Strobilanthes | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Strobilanthopsis | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Strobilidium | Choreotrichida | Lynn (2008) | . | ICZN |
| Strobilomonas | | Novarino (2003) | Domain Eucarya - Kingdom Cryptobiontes ? - Phylum Cryptophyta ? or Phylum Kathablepharida ?. | ICBN |
| Strobilopsis | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Stromanthe | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Stromatocarpus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Stromatopteris | Gleicheniales | Christenhusz et al. (2011) | . | ICBN |
| Stromatospongia | Agelasida | Vacelet (2002) | . | ICZN |
| Strombidinopsis | Choreotrichida | Lynn (2008) | . | ICZN |
| Strombidium | Strombidiida | Lynn (2008) | . | ICZN |
| Strombocactus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Strombomonas | Euglenales | Leedale (1967); Leedale (2000); Brosnan et al. (2005) | . | ICBN |
| Strombosia | Santalales | Mabberley (2008) | Erythropalaceae. | ICBN |
| Strombosiopsis | Santalales | Mabberley (2008) | Olacaceae. | ICBN |
| Strombulidens | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Strongylacidon | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Strongylamma | Poecilosclerida | Van Soest & Hajdu (2002) | . | ICZN |
| Strongylidium | Stichotrichida | Lynn (2008) | . | ICZN |
| Strongylodesma | Poecilosclerida | Samaai & Kelly (2002) | . | ICZN |
| Strongylodon | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Strongylopus | Anura | Vitt & Caldwell (2009) | Pyxicephalidae. | ICZN |
| Strophanthus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Strophioblachia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Strophocactus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Strophostyles | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Strophurus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Strotheria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Struckia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Strumaria | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Strumpfia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Struthanthus | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Struthidea | Passeriformes | Clements (2007) | . | ICZN |
| Struthio | Struthioniformes | Clements (2007) | . | ICZN |
| Struthiola | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Strychnopsis | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Strychnos | Gentianales | Mabberley (2008) | Loganiaceae. | ICBN |
| Stryphnodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stryphnus | Astrophorida | Uriz (2002) | . | ICZN |
| Stuartia | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Fursenkoinidae. | ICZN |
| Stuartina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stubendorffia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Stuckenia | Alismatales | Mabberley (2008) | Potamogetonaceae. | ICBN |
| Stuckertiella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Studeriotes | Alcyonacea | Bayer (1981) | Paralcyoniidae. | ICZN |
| Stuessya | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stuhlmannia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stumpffia | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Sturnella | Passeriformes | Clements (2007) | . | ICZN |
| Sturnia | Passeriformes | Clements (2007) | . | ICZN |
| Sturnira | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Sturnus | Passeriformes | Clements (2007) | . | ICZN |
| Stussenia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Styela | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Styelidae. | ICZN |
| Styelopsis | Stolidobranchia | Monniot & Monniot (1972) | Junior synonym of Dendrodoa, as a subgenus. | ICZN |
| Stygamoeba | Stygamoebida | Patterson et al. (2000); Smirnov et al. (2005); Smirnov et al. (2011) | . | ICZN |
| Stygarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Stygiolobus | Sulfolobales | Garrity et al. (2005) | . | ICNB |
| Stygiomedusa | Semaeostomeae | Kramp (1961) | . | ICZN |
| Stylacontarium | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Stylantheca | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Stylapterus | Myrtales | Mabberley (2008) | Crypteroniaceae. | ICBN |
| Stylaraea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Stylaster | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Stylatractus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Stylatula | Pennatulacea | Williams (1995) | . | ICZN |
| Stylicauda | Tintinnida | Lynn (2008) | . | ICZN |
| Stylidium | Asterales | Mabberley (2008) | Stylidiaceae. | ICBN |
| Stylisma | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Stylissa | Halichondrida | Van Soest et al. (2002) | . | ICZN |
| Stylobasium | Fabales | Mabberley (2008) | Surianaceae. | ICBN |
| Stylobates | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Stylocephaloides | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Stylocephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Styloceras | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Styloceras | Buxales | Mabberley (2008) | Buxaceae. | ICBN |
| Stylochaeta | Chaetonotida | Balsamo et al. (2009) | . | ICZN |
| Stylochaeton | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Stylochlamydium | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Stylochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Stylochromonas | Craspedida | Nitsche et al. (2011) | . | ICZN |
| Stylochromonas | | Kristiansen & Preisig (2001) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta. | ICBN |
| Stylochrysalis | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (biflagellate). | ICBN |
| Stylocline | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stylococcus | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Stylocoeniella | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Stylocometes | Evaginogenida | Lynn (2008) | . | ICZN |
| Stylocordyla | Hadromerida | Van Soest (2002) | . | ICZN |
| Stylocoronella | Stauromedusae | Salvini-Plawen (1966) | Now checking. | ICZN |
| Styloctenium | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Stylocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Stylodictya | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Stylodinium | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Stylodipus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Stylogyne | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Stylohedra | Peritrichida | Lynn (2008); Zhan et al. (2009) | Later synonym of Lagenophrys. | ICZN |
| Stylomecon | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Stylomecynostomum | Acoela | Hooge & Tyler (2003) | . | ICZN |
| Stylonema | Stylonematales | Schneider & Wynne (2007) | . | ICBN |
| Stylonethes | Stichotrichida | Lynn (2008) | nomen dubium. | ICZN |
| Stylonychia | Sporadotrichida | Lynn (2008) | . | ICZN |
| Stylopathes | Antipatharia | Opresko (2006) | . | ICZN |
| Stylophora | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Stylophorum | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Stylophrya | Endogenida | Lynn (2008) | . | ICZN |
| Stylosanthes | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Stylosiphonia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Stylotrichium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Stypandra | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Styphelia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Styphnolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Styppeiochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Styptosphaera | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Styraconyx | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Styrax | Ericales | Mabberley (2008) | Styracaceae. | ICBN |
| Styxophrya | Sporadotrichida | Lynn (2008) | . | ICZN |
| Suaeda | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Subanomalina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nonionidae. | ICZN |
| Subcorynosoma | Polymorphida | Amin (1992) | Junior synonym of Polymorphus. | ICZN |
| Subdoligranulum | Clostridiales | Holmstrøm et al. (2004) | . | ICNB |
| Subedentostomina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Suberanthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Suberea | Verongida | Bergquist & Cook (2002) | . | ICZN |
| Subergorgia | Alcyonacea | Bayer (1981) | Subergorgiidae. | ICZN |
| Suberites | Hadromerida | Van Soest (2002) | . | ICZN |
| Subfischerina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Fischerinidae. | ICZN |
| Sublegatus | Passeriformes | Clements (2007) | . | ICZN |
| Subpatellinella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Placentulinidae. | ICZN |
| Subreophax | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Subsaxibacter | Flavobacteriales | Bowman & Nichols (2005) | . | ICNB |
| Subsaximicrobium | Flavobacteriales | Bowman & Nichols (2005) | . | ICNB |
| Subsidebottomina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Subtercola | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Subulamoeba | Dactylopodida | Rogerson & Patterson (2000); Smirnov et al. (2005) | Vexilliferidae. | ICZN |
| Subularia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Subulatomonas | Breviatida | Katz et al. (2011) | Ordinal affiliation to Breviatida was not mentioned by the original authors, but close relationship between Breviata and Subulatomonas was shown. | ICZN |
| Succinatimonas | Aeromonadales | Morotomi et al. (2010) | . | ICNB |
| Succiniclasticum | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Succinimonas | Aeromonadales | Garrity et al. (2005) | . | ICNB |
| Succinispira | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Succinivibrio | Aeromonadales | Garrity et al. (2005) | . | ICNB |
| Succisa | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Succisella | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Succowia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Suchtelenia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Suckleya | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sucrea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Suddia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Suessenguthia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Suessenguthiella | Caryophyllales | Mabberley (2008) | Molluginaceae. | ICBN |
| Sugiura | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Suhria | Gelidiales | Schneider & Wynne (2007) | Later synonym of Gelidium. | ICBN |
| Suiadifflugia | Arcellinida | Meisterfeld (2000) | Difflugina -- Difflugiidae. | ICZN |
| Suiriri | Passeriformes | Clements (2007) | . | ICZN |
| Suksdorfia | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Sula | Pelecaniformes | Clements (2007) | . | ICZN |
| Sulaimania | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Sulcastrella | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Desmanthidae. | ICZN |
| Sulcigera | Pleuronematida | Lynn (2008) | . | ICZN |
| Sulcoarcus | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Sulcochrysis | | Honda et al. (1995); Honda et al. (2007) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta - Class Dictyochophyceae. | ICBN |
| Sulcophax | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Sulculeolaria | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Sulfitobacter | Rhodobacterales | Garrity et al. (2005) | . | ICNB |
| Sulfobacillus | Clostridiales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Sulfolobus | Sulfolobales | Garrity et al. (2005) | . | ICNB |
| Sulfonecta | Armophorida | Lynn (2008) | . | ICZN |
| Sulfophobococcus | Desulfurococcales | Garrity et al. (2005) | . | ICNB |
| Sulfuricella | Hydrogenophilales | Kojima & Fukui (2010) | . | ICNB |
| Sulfuricurvum | Campylobacterales | Kodama & Watanabe (2004) | . | ICNB |
| Sulfurihydrogenibium | Aquificales | Garrity et al. (2005) | . | ICNB |
| Sulfurimonas | Campylobacterales | Inagaki et al. (2003) | . | ICNB |
| Sulfurisphaera | Sulfolobales | Garrity et al. (2005) | . | ICNB |
| Sulfuritalea | Rhodocyclales | Kojima & Fukui (2011) | . | ICNB |
| Sulfurivirga | Thiotrichales | Takai et al. (2006) | . | ICNB |
| Sulfurococcus | Sulfolobales | Garrity et al. (2005) | . | ICNB |
| Sulfurospirillum | Campylobacterales | Garrity et al. (2005) | . | ICNB |
| Sulfurovum | Campylobacterales | Inagaki et al. (2004) | . | ICNB |
| Sulla | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sullivantia | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Sultanophrys | Protostomatida | Lynn (2008) | . | ICZN |
| Sumatroscirpus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Sumbaviopsis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Summerhayesia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Suncus | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Sundacarpus | Araucariales | Farjon (2001); Eckenwalder (2009); Christenhusz et al. (2011) | . | ICBN |
| Sundamys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sundasciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Sundbergia | Heteronemertea | Kajihara et al. (2008) | . | ICZN |
| Sunipia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sunxiuqinia | Bacteroidales | Qu et al. (2011) | . | ICNB |
| Supraspathidium | Haptorida | Lynn (2008) | . | ICZN |
| Surdisorex | Soricomorpha | Hutterer (2005) | . | ICZN |
| Suregada | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Suriana | Fabales | Mabberley (2008) | Surianaceae. | ICBN |
| Suricata | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Surnia | Strigiformes | Clements (2007) | . | ICZN |
| Surniculus | Cuculiformes | Clements (2007) | . | ICZN |
| Sus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Sussenia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Suta | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Sutera | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Sutorectus | Orectolobiformes | Nelson (2006) | . | ICZN |
| Sutrina | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Sutterella | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Suttonella | Cardiobacteriales | Garrity et al. (2005) | . | ICNB |
| Suzukia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Svenia | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nodosariidae. | ICZN |
| Svenkoeltzia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Svenzea | Halichondrida | Van Soest et al. (2002) | . | ICZN |
| Svitramia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Svratkina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Alabaminidae. | ICZN |
| Swainsona | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Swallenia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Swaminathania | Rhodospirillales | Loganathan & Nair (2004) | . | ICNB |
| Swartschewskia | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Swartzia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Swedmarkia | Euplotida | Lynn (2008) | . | ICZN |
| Sweetia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Swertia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Swietenia | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Swiftia | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |
| Swinglea | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Swintonia | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Swynnertonia | Passeriformes | Clements (2007) | . | ICZN |
| Syagrus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Sycandra | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sycantha | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sycetta | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sycettaga | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Sycettusa | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sycia | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Sycodorus | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sycon | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Syconessa | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Syconycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Sycopsis | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Sycozoa | Aplousobranchia | Monniot & Monniot (1972); Kott (1998); Monniot (2001) | Holozoidae. | ICZN |
| Sycute | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sycyssa | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Syllarcon | Exogenida | Lynn (2008) | . | ICZN |
| Syltodinium | Gymnodiniales | Fensome et al. (1993) | . | ICBN |
| Sylvacaecilia | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Sylvia | Passeriformes | Clements (2007) | . | ICZN |
| Sylvicapra | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Sylvichadsia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Sylvietta | Passeriformes | Clements (2007) | . | ICZN |
| Sylvilagus | Lagomorpha | McKenna & Bell (1997) | . | ICZN |
| Sylviorthorhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Sylviparus | Passeriformes | Clements (2007) | . | ICZN |
| Sylvisorex | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Syma | Coraciiformes | Clements (2007) | . | ICZN |
| Symbiezidium | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Symbiobacterium | Clostridiales | Ohno et al. (2000); Ueda et al. (2004); Kunisawa (2007); Ludwig et al. (2009) | . | ICNB |
| Symbiodinium | Suessiales | Fensome et al. (1993) | . | ICBN |
| Symbiomonas | Anoecales | Cavalier-Smith & Chao (2006) | . | ICZN |
| Symbion | Symbiida | Funch & Kristensen (1995) | . | ICZN |
| Symbiotes | Rickettsiales | Garrity et al. (2005) | . | ICNB |
| Symblepharis | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Symbolanthus | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Symmeria | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Symmetroscyphus | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Symonanthus | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Sympagella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Sympegma | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Sympetalandra | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Symphalangus | Primates | Groves (2005) | . | ICZN |
| Symphimus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Symphionema | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Sympholis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Symphonia | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Symphorema | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Symphoricarpos | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Symphyandra | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Symphyglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Symphyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Symphyllia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Symphyllocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Symphyllophyton | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Symphyochlamys | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Symphyocladia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Symphyocolax | Ceramiales | Kim & Cho (2010) | . | ICBN |
| Symphyodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Symphyogyna | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Symphyogynopsis | Fossombroniales | He-Nygrén et al. (2006); Crandall-Stotler et al. (2009) | . | ICBN |
| Symphyoloma | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Symphyonema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Symphyonemopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Symphyopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Symphyosepalum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Symphyotrichum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Symphysia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Symphysodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Symphysodontella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Symphytocarpus | Stemonitales | Yamamoto (1998) | . | ICBN |
| Symphytum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Symplectella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Symplectoscyphus | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Symplectrodia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Symplegma | Stolidobranchia | Monniot & Monniot (1972) | Styelidae. | ICZN |
| Symploca | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Symplocarpus | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Symplocastrum | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Symplococarpon | Ericales | Mabberley (2008) | Pentaphylacaceae. | ICBN |
| Symplocos | Ericales | Mabberley (2008) | Symplocaceae. | ICBN |
| Sympodangia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Sympodium | Alcyonacea | Bayer (1981) | Xeniidae. | ICZN |
| Sympodophyllum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sympodothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Sympterygia | Rajiformes | Nelson (2006) | . | ICZN |
| Symsagittifera | Acoela | Kostenko & Mamkaev (1990) | Under confirmation. | ICZN |
| Synactinernus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Synallaxis | Passeriformes | Clements (2007) | . | ICZN |
| Synammia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Synamoeba | | Bass et al. (2009) | Domain Eucarya - Rhizaria. | ICZN |
| Synandra | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Synandrodaphne | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Synandropus | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Synandrospadix | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Synandwakia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Synantheopsis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Synaphea | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Synapsis | Lamiales | Mabberley (2008) | Schlegeliaceae. | ICBN |
| Synaptantha | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Synaptolepis | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Synaptomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Synarachnactis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Synarthrophyton | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Syncalathium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syncarpa | Stolidobranchia | Monniot & Monniot (1972) | Styelidae. | ICZN |
| Syncarpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syncarpia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Syncephalum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syncerus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Synchaeta | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Synchroma | Synchromales | Horn et al. (2007) | . | ICBN |
| Syncilancistrumina | Thigmotrichida | Lynn (2008) | . | ICZN |
| Synclisia | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Syncolostemon | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Syncretocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syncyathella | Peritrichida | Lynn (2008); Zhan et al. (2009) | Nomen nudum. | ICZN |
| Syncystis | Neogregarinorida | Perkins et al. (2000) | . | ICZN |
| Syndactyla | Passeriformes | Clements (2007) | . | ICZN |
| Syndactylactis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Syndendrodoa | Stolidobranchia | Monniot & Monniot (1972) | Styelidae. | ICZN |
| Syndetophyllum | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Syndiazona | Aplousobranchia | Monniot & Monniot (1972); Kott (1998) | Diazonidae. | ICZN |
| Syndinium | Syndinida | Fensome et al. (1993) | . | ICZN |
| Syndyophyllum | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Synechanthus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Synechococcus | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Synechocystis | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Synedrella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Synedrellopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syneilesis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Synergistes | Synergistales | Garrity et al. (2005); Jumas-Bilak et al. (2007); Jumas-Bilak et al. (2009) | . | ICNB |
| Syngonanthus | Poales | Mabberley (2008) | Eriocaulaceae. | ICBN |
| Syngonium | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Syngramma | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Synhalcampella | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Synhalcurias | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Synhymenia | Synhymeniida | Lynn (2008) | . | ICZN |
| Synima | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Synoicum | Aplousobranchia | Monniot & Monniot (1972); Monniot (2001) | Polyclinidae. | ICZN |
| Synophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Synophrya | Apostomatida | Lynn (2008) | . | ICZN |
| Synotis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Synoum | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Synsepalum | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Synsicyonis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Synstemon | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Synthecium | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Syntheosciurus | Rodentia | Thorington, Jr. & Hoffmann (2005) | . | ICZN |
| Synthetodontium | Bryales | Goffinet et al. (2009) | . | ICBN |
| Synthliboramphus | Charadriiformes | Clements (2007) | . | ICZN |
| Synthlipsis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Syntriandrium | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Syntrichia | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Syntrichopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syntrophaceticus | Thermoanaerobacterales | Westerholm et al. (2010) | . | ICNB |
| Syntrophobacter | Syntrophobacterales | Garrity et al. (2005) | . | ICNB |
| Syntrophobotulus | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Syntrophococcus | Clostridiales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Syntrophomonas | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Syntrophorhabdus | | Qiu et al. (2008) | Domain Bacteria - Phylum Proteobacteria - Class Deltaproteobacteria. | ICNB |
| Syntrophospora | Clostridiales | Garrity et al. (2005); Wu et al. (2006) | Later synonym of Syntrophomonas. | ICNB |
| Syntrophothermus | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Syntrophus | Syntrophobacterales | Garrity et al. (2005) | . | ICNB |
| Synura | Synurales | Kristiansen & Preisig (2001) | Synuraceae. | ICBN |
| Synuropsis | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Synurus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Synute | Leucosolenida | Borojevic et al. (2002) | . | ICZN |
| Sypheotides | Gruiformes | Clements (2007) | . | ICZN |
| Syracolithus | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007); Couapel et al. (2009) | former Calyptrosphaeraceae. Helicosphaeraceae?. | ICBN |
| Syracosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Syracosphaeraceae. | ICBN |
| Syreitschikovia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Syrigma | Ciconiiformes | Clements (2007) | . | ICZN |
| Syringa | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Syringammina | Psamminida | Gooday & Tendal (2000) | . | ICZN |
| Syringantha | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Syringocolax | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Syringodea | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Syringodium | Alismatales | Mabberley (2008) | Cymodoceaceae. | ICBN |
| Syringopharynx | Rhynchodida | Lynn (2008) | . | ICZN |
| Syringothecium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Syrmaticus | Galliformes | Clements (2007) | . | ICZN |
| Syrmatium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Syrrhaptes | Pterocliformes | Clements (2007) | . | ICZN |
| Syrrheonema | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Syrrhopodon | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Systellantha | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Systeloglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Systemapora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Systemonodaphne | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Systenostrema | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Systenotheca | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Syzygangia | Myzocytiopsidales | Dick (2001); Kirk et al. (2008) | Myzocytiopsidaceae. | ICBN |
| Syzygiella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Syzygium | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Szovitsia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |