| Genus |
Order |
Reference |
Note |
Nomenclature |
| C | |
| Caatinganthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Caballerorhynchus | Echinorhynchida | Amin (1985) | . | ICZN |
| Cabassous | Xenarthra | McKenna & Bell (1997) | . | ICZN |
| Cabomba | Nymphaeales | Mabberley (2008) | Cabombaceae. | ICBN |
| Cabra | Peridiniales | Murray & Patterson (2004) | . | ICBN |
| Cabralea | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Cabreriella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cacajao | Primates | McKenna & Bell (1997) | . | ICZN |
| Cacaliopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cacatua | Psittaciformes | Clements (2007) | . | ICZN |
| Caccinia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cachonella | | Fensome et al. (1993); Skovgaard et al. (2007) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. Former Blastodiniales. | ICBN |
| Cachonodinium | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Cachrys | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cacicus | Passeriformes | Clements (2007) | . | ICZN |
| Cacomantis | Cuculiformes | Clements (2007) | . | ICZN |
| Cacophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Cacosmia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cacospongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Cacosternum | Anura | Vitt & Caldwell (2009) | Pyxicephalidae. | ICZN |
| Cactosoma | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cadaba | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Cadellia | Fabales | Mabberley (2008) | Surianaceae. | ICBN |
| Cadetia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cadia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cadiscus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Caduceia | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Caduciella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Caecilia | Gymnophiona | Vitt & Caldwell (2009) | "Caeciliidae". | ICZN |
| Caecitellus | Anoecales | Cavalier-Smith & Chao (2006) | . | ICZN |
| Caecosagitta | Aphragmophora | Bieri (1991) | Sagittidae. | ICZN |
| Caedibacter | Rickettsiales | Garrity et al. (2005) | . | ICNB |
| Caelebogyne | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Caelospermum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Caenagnesia | Phlebobranchia | Monniot & Monniot (1972) | Agneziidae. | ICZN |
| Caenibacterium | Burkholderiales | Manaia et al. (2003) | . | ICNB |
| Caenimonas | Burkholderiales | Ryu et al. (2008) | . | ICNB |
| Caenispirillum | Rhodospirillales | Yoon et al. (2007) | . | ICNB |
| Caenolestes | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Caenomorpha | Armophorida | Lynn (2008) | . | ICZN |
| Caesalpinia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Caesia | Asparagales | Mabberley (2008) | Hemerocallidaceae. | ICBN |
| Caesulia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cafeteria | Anoecales | Cavalier-Smith & Chao (2006) | . | ICZN |
| Cailliella | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Caiman | Crocodylia | Vitt & Caldwell (2009) | Alligatoridae. | ICZN |
| Caimanops | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Cairina | Anseriformes | Clements (2007) | . | ICZN |
| Cajanus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cajophora | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Cakile | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Calabaria | Squamata | Vitt & Caldwell (2009) | Serpentes. Boidae. | ICZN |
| Calacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Caladenia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Caladium | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Calamactinia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Calamactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Calamagrostis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Calamanthus | Passeriformes | Clements (2007) | . | ICZN |
| Calamaria | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Calamodontophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Calamonastes | Passeriformes | Clements (2007) | . | ICZN |
| Calamophyllum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Calamorhabdium | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Calamospiza | Passeriformes | Clements (2007) | . | ICZN |
| Calamovilfa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Calamphora | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Calamus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Calanda | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Calandrella | Passeriformes | Clements (2007) | . | ICZN |
| Calandrinia | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Calanthe | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calanthea | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Calantica | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Calanticaria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calathea | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Calathodes | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Calatholejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Calatola | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Calcaratolobelia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Calcareoboea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Calcarina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Calcarinidae. | ICZN |
| Calcarius | Passeriformes | Clements (2007) | . | ICZN |
| Calcarobiotus | Parachela | Kinchin (1994) | . | ICZN |
| Calceolaria | Lamiales | Mabberley (2008) | Calceolariaceae. | ICBN |
| Calciarcus | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Papposphaeraceae ?. | ICBN |
| Calcidiscus | Coccolithales | Jordan et al. (2004) | Calcidiscaceae. | ICBN |
| Calcifibrospongia | Haplosclerida | Van Soest (2002) | . | ICZN |
| Calcigonellum | Peridiniales | Fensome et al. (1993); D'Onofrio et al. (1999) | . | ICBN |
| Calcigorgia | Alcyonacea | Bayer (1981) | Acanthogorgiidae. | ICZN |
| Calciodinellum | Peridiniales | Fensome et al. (1993); D'Onofrio et al. (1999) | . | ICBN |
| Calciopappus | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Syracosphaeraceae. | ICBN |
| Calciosolenia | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Calciosoleniaceae. | ICBN |
| Calciphilopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Calcituba | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nubeculariidae. | ICZN |
| Calcochloris | Afrosoricida | Bronner & Jenkins (2005) | . | ICZN |
| Caldalkalibacillus | Bacillales | Xue et al. (2006) | . | ICNB |
| Caldanaerobacter | Thermoanaerobacterales | Fardeau et al. (2004); Ludwig et al. (2009) | . | ICNB |
| Caldanaerobius | Thermoanaerobacterales | Lee et al. (2008) | . | ICNB |
| Caldanaerovirga | Thermoanaerobacterales | Wagner et al. (2009) | . | ICNB |
| Caldcluvia | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Calderobacterium | Aquificales | Garrity et al. (2005) | . | ICNB |
| Calderonella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Caldesia | Alismatales | Mabberley (2008) | Alismataceae. | ICBN |
| Caldibacillus | Bacillales | Coorevits et al. (2012) | . | ICNB |
| Caldicellulosiruptor | Thermoanaerobacterales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Caldicoprobacter | Clostridiales | Yokoyama et al. (2010) | . | ICNB |
| Caldilinea | Caldilineales | Sekiguchi et al. (2003); Yamada et al. (2006) | . | ICNB |
| Caldimicrobium | Thermodesulfobacteriales | Miroshnichenko et al. (2009) | . | ICNB |
| Caldimonas | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Caldisericum | Caldisericales | Mori et al. (2009) | . | ICNB |
| Caldisphaera | Acidilobales | Garrity et al. (2005); Prokofeva et al. (2009) | . | ICNB |
| Calditerricola | Bacillales | Moriya et al. (2011) | . | ICNB |
| Calditerrivibrio | Geovibriales | Iino et al. (2008) | . | ICNB |
| Caldithrix | | Miroshnichenko et al. (2003) | Domain Bacteria. | ICNB |
| Caldivirga | Thermoproteales | Garrity et al. (2005) | . | ICNB |
| Calea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Caleana | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calectasia | Dasypogonales | Mabberley (2008) | Dasypogonaceae. | ICBN |
| Caledoniella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Caledoniscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Calemys | Testudinata | Vitt & Caldwell (2009) | Emydidae. | ICZN |
| Calendula | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calendulauda | Passeriformes | Clements (2007) | . | ICZN |
| Calepina | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Calia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Calibanus | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Calibelemnon | Pennatulacea | Williams (1995) | . | ICZN |
| Calicalicus | Passeriformes | Clements (2007) | . | ICZN |
| Calicasphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Calicharis | Asparagales | Mabberley (2008) | xCalicharis. Caliphruria x Eucharis hybrids. Amaryllidaceae. | ICBN |
| Calicogorgia | Alcyonacea | Bayer (1981) | Plexauridae. | ICZN |
| Calicorema | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Calidifontibacter | Micrococcales | Ruckmani et al. (2011); Ludwig et al. (2012) | Dermacoccaceae. | ICNB |
| Calidris | Charadriiformes | Clements (2007) | . | ICZN |
| Caliechthrus | Cuculiformes | Clements (2007) | . | ICZN |
| Caliperia | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Caliphruria | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Calispadella | Phragmophora | Casanova & Moreau (2005) | Spadellidae. | ICZN |
| Calkinsia | Postgaardida | Leedale (1967); Leedale (2000); Cavalier-Smith (2003); Yubuki et al. (2009) | Possibly in order Sphenomonadales. Clade "Symbiontida". | ICZN |
| Calla | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Callacanthis | Passeriformes | Clements (2007) | . | ICZN |
| Callaeas | Passeriformes | Clements (2007) | . | ICZN |
| Callaeum | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Callagur | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Callerya | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Calliacantha | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Calliactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Calliandra | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Calliandropsis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Callianira | Cydippida | Harbison & Madin (1982) | . | ICZN |
| Callianthemoides | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Callianthemum | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Calliarthron | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Calliblepharis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Callicarpa | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Callicarpa | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Callicebus | Primates | McKenna & Bell (1997) | . | ICZN |
| Callicephalus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Callichilia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Callichlamys | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Callicladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Calliclavula | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Callicoma | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Callicostella | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Callicostellopsis | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Callidictyon | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Calliergon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Calliergonella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Calligonum | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Callilepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Callimico | Primates | McKenna & Bell (1997) | . | ICZN |
| Callimitra | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Callinera | Palaeonemertea | Gibson (1995) | . | ICZN |
| Calliophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Elapidae. | ICZN |
| Callipelta | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Neopeltidae. | ICZN |
| Callipeltis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Callipepla | Galliformes | Clements (2007) | . | ICZN |
| Calliphlox | Apodiformes | Clements (2007) | . | ICZN |
| Callipodium | Alcyonacea | Bayer (1981) | Anthothelidae. | ICZN |
| Callirhoe | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Callisaurus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Callisia | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Callistachys | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Callistemon | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Callistephus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Callisthene | Myrtales | Mabberley (2008) | Vochysiaceae. | ICBN |
| Callistomys | Rodentia | Woods & Kilpatrick (2005) | . | ICZN |
| Callistopteris | Hymenophyllales | Christenhusz et al. (2011) | . | ICBN |
| Callithamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Callithrix | Primates | McKenna & Bell (1997) | . | ICZN |
| Callitriche | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Callitris | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Callitropsis | Cupressales | Mill & Farjon (2006); Little (2006); Adams et al. (2009); Debreczy et al. (2009); Eckenwalder (2009); Christenhusz et al. (2011) | Christenhusz et al. (2011) treated Callitropsis as a later synonym of Cupressus. | ICBN |
| Callixalus | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Callocephalon | Psittaciformes | Clements (2007) | . | ICZN |
| Callocolax | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Callogorgia | Alcyonacea | Bayer (1981) | Primnoidae. | ICZN |
| Callonetta | Anseriformes | Clements (2007) | . | ICZN |
| Callophycus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Callophyllis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Callopistes | Squamata | Vitt & Caldwell (2009) | Teiidae. | ICZN |
| Callopsis | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Callorhinchus | Chimaeriformes | Nelson (2006) | . | ICZN |
| Callorhinus | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Callosciurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Calloselasma | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Calloseris | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Callozostron | Alcyonacea | Bayer (1981) | Primnoidae. | ICZN |
| Calluella | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Callulina | Anura | Vitt & Caldwell (2009) | Brevicipitidae. | ICZN |
| Callulops | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Calluna | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Callynthrochlamys | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Callyspongia | Haplosclerida | Desqueyroux-Faúndez & Valentine (2002) | . | ICZN |
| Calocedrus | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Calocephalus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calochaetes | Passeriformes | Clements (2007) | . | ICZN |
| Calochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calochlaena | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Calochone | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Calochortus | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Calocitta | Passeriformes | Clements (2007) | . | ICZN |
| Calocrater | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Calodactylodes | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Calodecaryia | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Calodendrum | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Caloenas | Columbiformes | Clements (2007) | . | ICZN |
| Caloglossa | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Calohypsibius | Parachela | Kinchin (1994) | . | ICZN |
| Calomeria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calomnion | Rhizogoniales | Goffinet et al. (2009) | . | ICBN |
| Calomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Calomyscus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Calomyxa | Trichiales | Yamamoto (1998) | . | ICBN |
| Caloncoba | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Calonectris | Procellariiformes | Clements (2007) | . | ICZN |
| Calonema | Trichiales | Yamamoto (1998) | . | ICBN |
| Calonemertes | Pelagica | Gibson (1995) | . | ICZN |
| Calonitophyllum | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Calonympha | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Calopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Caloperdix | Galliformes | Clements (2007) | . | ICZN |
| Calophaca | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Calophyllum | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Calopogon | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calopogonium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Caloprymnus | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Calopsis | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Calopyxis | Myrtales | Mabberley (2008) | Combretaceae. | ICBN |
| Caloramator | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Caloranaerobacter | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Calorhamphus | Piciformes | Clements (2007) | . | ICZN |
| Caloribacterium | Thermoanaerobacterales | Slobodkina et al. (2012) | . | ICNB |
| Calorophus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Calos | Lituolida | Kaminski (2000) | Aschemocellidae. | ICZN |
| Caloscolex | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Calosiphonia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Calospira | Apostomatida | Lynn (2008) | . | ICZN |
| Calostemma | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Calostephane | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calotes | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Calotesta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calothamnus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Calotheca | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Calothorax | Apodiformes | Clements (2007) | . | ICZN |
| Calothrix | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Calotis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calotriton | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Calotropis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Calpanthula | Ceriantharia | Tiffon (1987) | . | ICZN |
| Calpasoma | Limnomedusae | Bouillon et al. (2006) | . | ICZN |
| Calpocalyx | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Calpurnia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Caltha | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Calthropella | Astrophorida | Van Soest & Hooper (2002) | . | ICZN |
| Caluera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calumma | Squamata | Vitt & Caldwell (2009) | Chamaeleonidae. | ICZN |
| Caluromys | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Caluromysiops | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Calvinia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Calvoa | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Calycacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Calycadenia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calycanthus | Laurales | Mabberley (2008) | Calycanthaceae. | ICBN |
| Calycella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Calycera | Asterales | Mabberley (2008) | Calyceraceae. | ICBN |
| Calycimonas | Sphenomonadales | Leedale (1967); Leedale (2000) | . | ICBN |
| Calycobolus | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Calycocarpum | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Calycogonium | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Calycolpus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Calycopeplus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Calycophyllum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Calycophysum | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Calycopsis | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Calycorectes | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Calycoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calycosia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Calycosiphonia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Calycosoma | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Calycularia | Fossombroniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Calyculogygas | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Calydorea | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Calymmanthera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calymmanthium | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Calymmatium | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Calymmatobacterium | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Calymmodon | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Calymperastrum | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Calymperes | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Calypogeia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Calypso | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calypte | Apodiformes | Clements (2007) | . | ICZN |
| Calyptocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Calyptocephalella | Anura | Vitt & Caldwell (2009) | Calyptocephalellidae. | ICZN |
| Calyptochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Calyptocichla | Passeriformes | Clements (2007) | . | ICZN |
| Calyptomena | Passeriformes | Clements (2007) | . | ICZN |
| Calyptommatus | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Calyptophilus | Passeriformes | Clements (2007) | . | ICZN |
| Calyptophractus | Cingulata | Gardner (2005) | . | ICZN |
| Calyptopogon | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Calyptopora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Calyptorete | Hexactinosida | Reiswig & Wheeler (2002) | . | ICZN |
| Calyptorhynchus | Psittaciformes | Clements (2007) | . | ICZN |
| Calyptospora | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Calyptothecium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Calyptotis | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Calyptotricha | Pleuronematida | Lynn (2008) | . | ICZN |
| Calyptraemalva | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Calyptralegnia | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Calyptranthera | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Calyptranthes | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Calyptrocalyx | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Calyptrocarya | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Calyptrochaeta | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Calyptrochilum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Calyptrocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Calyptrogenia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Calyptrogyne | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Calyptrolithina | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Calyptrolithophora | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Calyptronoma | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Calyptrophora | Alcyonacea | Bayer (1981) | Primnoidae. | ICZN |
| Calyptrosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Calyptrosphaera | Coccolithales | Jordan et al. (2004) | Later synonym of Syracosphaera. | ICBN |
| Calyptrotheca | Caryophyllales | Mabberley (2008) | Didiereaceae. | ICBN |
| Calyptura | Passeriformes | Clements (2007) | . | ICZN |
| Calytrix | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Calyx | Haplosclerida | Desqueyroux-Faúndez & Valentine (2002) | . | ICZN |
| Calyxocephalus | Eugregarinorida | Clopton (2004) | . | ICZN |
| Camarea | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Camarhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Camaroptera | Passeriformes | Clements (2007) | . | ICZN |
| Camarotea | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Camassia | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Cambessedesia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Camchaya | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Camelimonas | Rhizobiales | Kämpfer et al. (2010) | . | ICNB |
| Camelina | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Camelinopsis | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Camellia | Ericales | Mabberley (2008) | Theaceae. | ICBN |
| Camelus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Cameraria | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cameronyctus | Clevelandellida | Lynn (2008) | nomen dubium. | ICZN |
| Caminibacter | Nautiliales | Garrity et al. (2005); Miroshnichenko et al. (2004) | . | ICNB |
| Caminicella | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Caminothujaria | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Caminus | Astrophorida | Uriz (2002) | . | ICZN |
| Camissonia | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Camissoniopsis | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Camoensia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Camontagnea | Palmariales | Schneider & Wynne (2007) | . | ICBN |
| Campalecium | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Campanacephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Campanella | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Campaniclava | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Campanoeca | Acanthoecida | Nitsche et al. (2011) | . | ICZN |
| Campanula | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Campanularia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Campanulina | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Campanulospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Campascus | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Campbellonemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Campecarpus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Campephaga | Passeriformes | Clements (2007) | . | ICZN |
| Campephilus | Piciformes | Clements (2007) | . | ICZN |
| Campestigma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Campethera | Piciformes | Clements (2007) | . | ICZN |
| Camphorosma | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Campimia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Campnosperma | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Campochaera | Passeriformes | Clements (2007) | . | ICZN |
| Campomanesia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Campovassouria | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Campsiandra | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Campsidium | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Campsis | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Camptacra | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Camptandra | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Camptocarpus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Camptochaete | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Camptodontium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Camptolepis | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Camptoloma | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Camptorrhiza | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Camptosema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Camptostemon | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Camptostoma | Passeriformes | Clements (2007) | . | ICZN |
| Camptostylus | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Camptotheca | Cornales | Mabberley (2008) | Nyssaceae. | ICBN |
| Camptylonemopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Campuloclinium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Campylaephora | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Campylanthus | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Campyliadelphus | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Campylium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Campyloacantha | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Campylobacter | Campylobacterales | Garrity et al. (2005) | . | ICNB |
| Campylocentrum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Campyloderes | Cyclorhagida | Higgins (1990) | . | ICZN |
| Campylodinium | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Campylomonas | Cryptomonadales | Clay et al. (1999); Hoef-Emden & Melkonian (2003); Novarino (2003) | Later synonym of Cryptomonas. | ICBN |
| Campyloneurum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Campylopetalum | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Campylophyllopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Campylophyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Campylopodiella | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Campylopodium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Campylopterus | Apodiformes | Clements (2007) | . | ICZN |
| Campylopus | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Campylorhamphus | Passeriformes | Clements (2007) | . | ICZN |
| Campylorhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Campylosiphon | Dioscoreales | Mabberley (2008) | Burmanniaceae. | ICBN |
| Campylostachys | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Campylostelium | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Campylostemon | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Campylotropis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Campynema | Liliales | Mabberley (2008) | Campynemataceae. | ICBN |
| Campynemanthe | Liliales | Mabberley (2008) | Campynemataceae. | ICBN |
| Camurammina | Trochamminida | Kaminski (2000) | Trochammininae, Trochamminacea. | ICZN |
| Canaca | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Canacomyrica | Fagales | Mabberley (2008) | Myricaceae. | ICBN |
| Canadanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Canalohypopterygium | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Cananga | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Canarina | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Canariothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Canarium | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Canarya | Alcyonacea | Ocaña & van Ofwegen (2003) | Clavulariidae. | ICZN |
| Canastra | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Canavalia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Canbya | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Cancrinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cancriniella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cancris | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Bagginidae. | ICZN |
| Candeina | Globigerinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Candeinidae. | ICZN |
| Candelabrum | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Candidaspongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Candidatus Liberibacter | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Candidella | Alcyonacea | Bayer (1981) | Primnoidae. | ICZN |
| Candidimonas | Burkholderiales | Vaz-Moreira et al. (2011) | . | ICNB |
| Candoia | Squamata | Vitt & Caldwell (2009) | Serpentes. Boidae. | ICZN |
| Candolleodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Canella | Canellales | Mabberley (2008) | Canellaceae. | ICBN |
| Canepaia | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Sphaeramminidae. | ICZN |
| Canephora | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Canirallus | Gruiformes | Clements (2007) | . | ICZN |
| Canis | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Canistrolithus | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Alisphaeraceae ?. | ICBN |
| Canistropsis | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Canistrum | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Canna | Zingiberales | Mabberley (2008) | Cannaceae. | ICBN |
| Cannabis | Rosales | Mabberley (2008) | Cannabaceae. | ICBN |
| Cannaboides | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Canningia | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Cannomois | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Cannomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cannota | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Canotia | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Canscora | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Cansjera | Santalales | Mabberley (2008) | Opiliaceae. | ICBN |
| Cansumys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cantabrina | Poecilosclerida | Hooper (2002) | . | ICZN |
| Canteriomyces | Hyphochytriales | Dick (2001); Kirk et al. (2008) | Hyphochytriaceae. | ICBN |
| Cantharellus | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Canthariella | Tintinnida | Lynn (2008) | . | ICZN |
| Canthium | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cantleya | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Cantoria | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cantua | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Capanea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Capanemia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Capelio | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Capensibufo | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Capeobolus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Caperea | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Caperonia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Capillipedium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Capirona | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Capitanopsis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Capito | Piciformes | Clements (2007) | . | ICZN |
| Capitulariella | Tribonematales | Ettl (1978) | . | ICBN |
| Capitularina | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Capnea | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Capnella | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Capnocytophaga | Flavobacteriales | Garrity et al. (2005) | . | ICNB |
| Capnoides | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Capnophyllum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Capparis | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Capra | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Capraria | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Capreolia | Gelidiales | Schneider & Wynne (2007) | . | ICBN |
| Capreolus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Capricornis | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Caprimulgus | Caprimulgiformes | Clements (2007) | . | ICZN |
| Capriniana | Endogenida | Lynn (2008) | . | ICZN |
| Caprolagus | Lagomorpha | McKenna & Bell (1997) | . | ICZN |
| Capromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Capsaspora | Ministeriida | Hertel et al. (2002); Ruiz-Trillo et al. (2004); Ruiz-Trillo et al. (2008); Shalchian-Tabrizi et al. (2008) | . | ICZN |
| Capsella | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Capsellina | Cryomonadida | Meisterfeld (2000); Cavalier-Smith & Chao (2003); Howe et al. (2011) | . | ICZN |
| Capsicum | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Capsiempis | Passeriformes | Clements (2007) | . | ICZN |
| Capsosira | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Captaincookia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Capurodendron | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Capuronia | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Capuronianthus | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Caracal | Carnivora | Wozencraft (2005) | . | ICZN |
| Caracara | Falconiformes | Clements (2007) | . | ICZN |
| Caracasia | Ericales | Mabberley (2008) | Marcgraviaceae. | ICBN |
| Caragana | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Caraipa | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Carallia | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Caralluma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Carapa | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Carapichea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Carbophilus | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Carboxydibrachium | Thermoanaerobacterales | Garrity et al. (2005); Fardeau et al. (2009) | Later synonym of Caldanaerobacter. | ICNB |
| Carboxydocella | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Carboxydothermus | Thermoanaerobacterales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Carcharhinus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Carcharias | Lamniformes | Nelson (2006) | . | ICZN |
| Carcharodon | Lamniformes | Nelson (2006) | . | ICZN |
| Carchesium | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Carcinactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Carcinonemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Cardamine | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cardellina | Passeriformes | Clements (2007) | . | ICZN |
| Cardenanthus | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Cardenasiodendron | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Cardiandra | Cornales | Mabberley (2008) | Hydrangeaceae. | ICBN |
| Cardimyxobolus | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Cardinalis | Passeriformes | Clements (2007) | . | ICZN |
| Cardiobacterium | Cardiobacteriales | Garrity et al. (2005) | . | ICNB |
| Cardiochilos | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cardiochlamys | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Cardiocranius | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cardiocrinum | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Cardioderma | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Cardioglossa | Anura | Vitt & Caldwell (2009) | Arthroleptidae. | ICZN |
| Cardionema | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Cardiopetalum | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cardiopteris | Aquifoliales | Mabberley (2008) | Cardiopteridaceae. | ICBN |
| Cardiospermum | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Cardiosporidium | Piroplasmorida | Ciancio et al. (2008) | . | ICZN |
| Cardiostomatella | Philasterida | Lynn (2008) | . | ICZN |
| Cardopatium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cardotiella | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Carduelis | Passeriformes | Clements (2007) | . | ICZN |
| Carduus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cardwellia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Caretta | Testudinata | Vitt & Caldwell (2009) | Cheloniidae. | ICZN |
| Carettochelys | Testudinata | Vitt & Caldwell (2009) | Carettochelyidae. | ICZN |
| Carex | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Careya | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Cariacothrix | Cariacotrichida | Orsi et al. (2012) | . | ICZN |
| Cariama | Gruiformes | Clements (2007) | . | ICZN |
| Caribaeohypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Caribea | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Caribeanella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Planorbulinidae. | ICZN |
| Carica | Brassicales | Mabberley (2008) | Caricaceae. | ICBN |
| Caridohabitans | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Caridonax | Coraciiformes | Clements (2007) | . | ICZN |
| Carijoa | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Carinatogecko | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Carinavalva | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Carinesta | Palaeonemertea | Gibson (1995) | . | ICZN |
| Cariniana | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Carinichona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Carinina | Palaeonemertea | Gibson (1995) | . | ICZN |
| Carinoma | Palaeonemertea | Gibson (1995) | . | ICZN |
| Carinomella | Palaeonemertea | Gibson (1995) | . | ICZN |
| Carinoposthium | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Carissa | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Carlemannia | Lamiales | Mabberley (2008) | Carlemanniaceae. | ICBN |
| Carlephyton | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Carlesia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Carlfranklinoides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Discorbinellidae. | ICZN |
| Carlgrenia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Carlia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Carlina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Carlowrightia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Carlquistia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Carludovica | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Carmichaelia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Carminatia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Carnarvonia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Carnegiea | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Carnimonas | Oceanospirillales | Garrity et al. (2005) | . | ICNB |
| Carnobacterium | Lactobacillales | Garrity et al. (2005) | . | ICNB |
| Carollia | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Caronia | Lituolida | Kaminski (2000) | Caroniidae, Verneuilinacea. | ICZN |
| Caropsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Carotalcyon | Alcyonacea | Bayer (1981); Verseveldt & Bayer (1988) | Alcyoniidae. | ICZN |
| Carpacoce | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Carpanthea | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Carpediemonas | Carpediemonadida | Cavalier-Smith (2003) | . | ICZN |
| Carpentaria | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Carpenteria | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Victoriellidae. | ICZN |
| Carpenteria | Cornales | Mabberley (2008) | Hydrangeaceae. | ICBN |
| Carpesium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Carpha | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Carphalea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Carphania | Echiniscoidea | Kinchin (1994) | . | ICZN |
| Carphephorus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Carphochaete | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Carphodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Carphophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Carpinus | Fagales | Mabberley (2008) | Betulaceae. | ICBN |
| Carpitalpa | Afrosoricida | Bronner & Jenkins (2005) | . | ICZN |
| Carpoblepharis | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Carpobrotus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Carpocanistrum | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Carpococcyx | Cuculiformes | Clements (2007) | . | ICZN |
| Carpodacus | Passeriformes | Clements (2007) | . | ICZN |
| Carpodectes | Passeriformes | Clements (2007) | . | ICZN |
| Carpodetus | Asterales | Mabberley (2008) | Rousseaceae. | ICBN |
| Carpodiptera | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Carpolobia | Fabales | Mabberley (2008) | Polygalaceae. | ICBN |
| Carpomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Carpopeltis | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Carpornis | Passeriformes | Clements (2007) | . | ICZN |
| Carposphaera | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Carpospiza | Passeriformes | Clements (2007) | . | ICZN |
| Carpothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Carpotroche | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Carpoxylon | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Carrichtera | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Carrierea | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Carrissoa | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Carronia | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Carruanthus | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Carruthersia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Carterella | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Carterina | Carterinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Carterinidae. | ICZN |
| Carteriospongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Carterodon | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Carthamus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cartonema | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Carum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Carvalhoa | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Carya | Fagales | Mabberley (2008) | Juglandaceae. | ICBN |
| Carybdea | Cubomedusae | Kramp (1961) | . | ICZN |
| Caryocar | Malpighiales | Mabberley (2008) | Caryocaraceae. | ICBN |
| Caryodaphnopsis | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Caryodendron | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Caryomene | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Caryomys | Rodentia | Musser & Carleton (2005) | . | ICZN |
| Caryophanon | Bacillales | Garrity et al. (2005) | . | ICNB |
| Caryophyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Caryopteris | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Caryospora | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Caryota | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Caryothraustes | Passeriformes | Clements (2007) | . | ICZN |
| Caryotophora | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Caryotricha | Kiitrichida | Lynn (2008) | . | ICZN |
| Caryotropha | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Casarea | Squamata | Vitt & Caldwell (2009) | Serpentes. Bolyeriidae. | ICZN |
| Casasia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cascadia | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Cascaronia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Casearia | Malpighiales | Mabberley (2008) | Salicaceae. | ICBN |
| Cashia | Euamoebida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Casimirella | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Casimiroa | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Casinycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Casiornis | Passeriformes | Clements (2007) | . | ICZN |
| Caspiomyzon | Petromyzontiformes | Nelson (2006) | . | ICZN |
| Caspionella | Pleuronematida | Lynn (2008) | . | ICZN |
| Cassebeera | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Casselia | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Cassia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cassidelina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Stainforthiidae. | ICZN |
| Cassidulina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Cassidulinoides | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cassidulinidae. | ICZN |
| Cassine | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Cassinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cassinopsis | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Cassiope | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cassiopea | Rhizostomeae | Kramp (1961) | . | ICZN |
| Cassipourea | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Cassytha | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Castanea | Phaeocalpida | Takahashi & Anderson (2000) | . | ICZN |
| Castanea | Fagales | Mabberley (2008) | Fagaceae. | ICBN |
| Castanella | Phaeocystida | Takahashi & Anderson (2000) | . | ICZN |
| Castanoclobos | Jungermanniales | Engel & Glenny (2007) | . | ICBN |
| Castanopsis | Fagales | Mabberley (2008) | Fagaceae. | ICBN |
| Castanospermum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Castanospora | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Castela | Sapindales | Mabberley (2008) | Simaroubaceae. | ICBN |
| Castellaniella | Burkholderiales | Kämpfer et al. (2006) | . | ICNB |
| Castellanosia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Castellia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Castelnavia | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Castenedia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Castilla | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Castilleja | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Castor | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Castratella | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Castrilanthemum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Casuarina | Fagales | Mabberley (2008) | Casuarinaceae. | ICBN |
| Casuarius | Struthioniformes | Clements (2007) | . | ICZN |
| Catablema | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Catabrosa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Catacolea | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Catadysia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Catagoniopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Catagonium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Catagonus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Catalaphyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Catalepidia | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Catalepis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Catalpa | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Catamblyrhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Catamenia | Passeriformes | Clements (2007) | . | ICZN |
| Catamixis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Catananche | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Catanthera | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Cataphellia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cataponera | Passeriformes | Clements (2007) | . | ICZN |
| Catasetum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Catatia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Catellatospora | Micromonosporales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Catellibacterium | Rhodobacterales | Tanaka et al. (2004) | . | ICNB |
| Catellicoccus | Lactobacillales | Lawson et al. (2006) | . | ICNB |
| Catelliglobosispora | Micromonosporales | Ara et al. (2008); Ludwig et al. (2012) | . | ICNB |
| Catena | Astrorhizida | Kaminski (2000); Özdikmen (2009) | Junior homonym. Substituted by Neocatena. | ICZN |
| Catenella | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Catenellocolax | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Catenellopsis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Catenibacterium | Erysipelotrichales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Catenococcus | Vibrionales | Garrity et al. (2005) | . | ICNB |
| Catenovulum | Alteromonadales | Yan et al. (2011) | . | ICNB |
| Catenulina | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Catenulispora | Catenulisporales | Busti et al. (2006); Ludwig et al. (2012) | . | ICNB |
| Catenuloplanes | Micromonosporales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Cateria | Cyclorhagida | Higgins (1990) | . | ICZN |
| Catesbaea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Catha | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Catharanthus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cathariostachys | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Catharomnion | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Catharopeza | Passeriformes | Clements (2007) | . | ICZN |
| Cathartes | Falconiformes | Clements (2007) | . | ICZN |
| Catharus | Passeriformes | Clements (2007) | . | ICZN |
| Cathaya | Pinales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Cathayacanthus | Echinorhynchida | Amin (1985) | . | ICZN |
| Cathayanthe | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Cathedra | Santalales | Mabberley (2008) | Olacaceae. | ICBN |
| Catherpes | Passeriformes | Clements (2007) | . | ICZN |
| Cathestecum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cathetostemma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cathormion | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Catocoryne | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Catoferia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Catolesia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Catolobus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Catonella | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Catophractes | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Catopsis | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Catopuma | Carnivora | Wozencraft (2005) | . | ICZN |
| Catoscopium | Catoscopiales | Stech & Frey (2008); Goffinet et al. (2009) | . | ICBN |
| Catostemma | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Catostylus | Rhizostomeae | Kramp (1961) | . | ICZN |
| Catreus | Galliformes | Clements (2007) | . | ICZN |
| Cattleya | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Catunaregam | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Caucaea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Caucalis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Caucanthus | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Caucasalia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Caudacaecilia | Gymnophiona | Vitt & Caldwell (2009) | Ichthyophiidae. | ICZN |
| Caudalejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Caudichthydium | Chaetonotida | Hummon & Todaro (2010) | . | ICZN |
| Caudiholosticha | Urostylida | Lynn (2008) | . | ICZN |
| Caudomyxum | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Caudospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Caulacanthus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Caulanthus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Caularthron | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Caulastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Caulicola | Peritrichida | Lynn (2008); Zhan et al. (2009) | Later synonym of Pyxicola. | ICZN |
| Caullerya | Ichthyophonida | Lohr et al. (2010) | . | ICZN |
| Caulleryella | Neogregarinorida | Perkins et al. (2000) | . | ICZN |
| Caulobacter | Caulobacterales | Garrity et al. (2005) | . | ICNB |
| Caulocalyx | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Caulocephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Caulokaempferia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Caulophacella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Caulophacus | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Caulophyllum | Ranunculales | Mabberley (2008) | Berberidaceae. | ICBN |
| Caulospongia | Hadromerida | Van Soest (2002) | . | ICZN |
| Causia | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Astrorhizidae. | ICZN |
| Caustis | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Causus | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Cautleya | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Cautula | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cavacoa | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cavalcantia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cavanillesia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cavea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cavendishia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cavernomonas | Cercomonadida | Bass et al. (2009) | . | ICZN |
| Cavernularia | Pennatulacea | Williams (1995) | . | ICZN |
| Cavernulina | Pennatulacea | Williams (1995) | . | ICZN |
| Cavia | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cavichona | Exogemmida | Lynn (2008) | . | ICZN |
| Cavicularia | Blasiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Caviomonas | Diplomonadida | Brugerolle & Lee (2000) | . | ICZN |
| Cavisoma | Echinorhynchida | Amin (1985) | . | ICZN |
| Cavostelium | Protosteliales | Olive (1975) | . | ICBN |
| Caxamarca | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cayaponia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Caylusea | Brassicales | Mabberley (2008) | Resedaceae. | ICBN |
| Cayratia | Vitales | Mabberley (2008) | Vitaceae. | ICBN |
| Ceanothus | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Cearanthes | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Cebuella | Primates | McKenna & Bell (1997); Groves (2005) | Later synonym of Callithrix. | ICZN |
| Cebus | Primates | McKenna & Bell (1997) | . | ICZN |
| Cecarria | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Cecembia | Cytophagales | Anil Kumar et al. (2012) | . | ICNB |
| Cecropia | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Cecropis | Passeriformes | Clements (2007) | . | ICZN |
| Cedecea | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Cedrela | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Cedrelinga | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cedrelopsis | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Cedronella | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cedrus | Pinales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Ceeceenus | Alcyonacea | van Ofwegen & Benayahu (2006) | Paralcyoniidae. | ICZN |
| Ceiba | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Celaenomys | Rodentia | McKenna & Bell (1997); Musser & Carleton (2005) | Later synonym of Chrotomys. | ICZN |
| Celastrus | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Celatiscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Celeribacter | Rhodobacterales | Ivanova et al. (2010) | . | ICNB |
| Celerina | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Celerinatantimonas | Alteromonadales | Cramer et al. (2011) | . | ICNB |
| Celerita | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Litostomatea - Subclass Haptoria. | ICZN |
| Celestus | Squamata | Vitt & Caldwell (2009) | Anguidae. | ICZN |
| Celeus | Piciformes | Clements (2007) | . | ICZN |
| Celianella | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Celiantha | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Celloniella | | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta - Class Chrysophyceae. Hydruraceae. | ICBN |
| Cellulomonas | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Cellulophaga | Flavobacteriales | Garrity et al. (2005) | . | ICNB |
| Cellulosibacter | Clostridiales | Watthanalamloet et al. (2012) | . | ICNB |
| Cellulosilyticum | Clostridiales | Cai & Dong (2010) | . | ICNB |
| Cellulosimicrobium | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Cellvibrio | Pseudomonadales | Garrity et al. (2005) | . | ICNB |
| Celmisia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Celosia | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Celtica | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Celtis | Rosales | Mabberley (2008) | Cannabaceae. | ICBN |
| Cemophora | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cenacrum | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Cenarrhenes | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Cenchrus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cenocentrum | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cenolophium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cenosphaera | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Cenostigma | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Centaurea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centaurium | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Centaurodendron | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centauropsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centaurothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centella | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Centema | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Centemopsis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Centipeda | Selenomonadales | Garrity et al. (2005); Marchandin et al. (2010) | . | ICNB |
| Centipeda | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centorumis | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Centotheca | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Centradenia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Centradeniastrum | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Centranthera | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Centranthus | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Centratherum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centritractus | Mischococcales | Ettl (1978) | . | ICBN |
| Centrobotrys | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Centroceras | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Centrocercus | Galliformes | Clements (2007) | . | ICZN |
| Centrocerocolax | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Centrochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Centrocubus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Centroderes | Cyclorhagida | Higgins (1990) | . | ICZN |
| Centrodinium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Centroglossa | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Centrolene | Anura | Vitt & Caldwell (2009) | Centrolenidae. | ICZN |
| Centrolepis | Poales | Mabberley (2008) | Centrolepidaceae. | ICBN |
| Centrolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Centromadia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Centronia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Centronycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Centrophorus | Squaliformes | Nelson (2006) | . | ICZN |
| Centroplacus | Malpighiales | Mabberley (2008) | Centroplacaceae. | ICBN |
| Centropodia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Centropogon | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Centropus | Cuculiformes | Clements (2007) | . | ICZN |
| Centropyxiella | Arcellinida | Meisterfeld (2000) | Difflugina -- Centropyxidae. | ICZN |
| Centropyxis | Arcellinida | Meisterfeld (2000) | Difflugina -- Centropyxidae. | ICZN |
| Centrorhynchus | Polymorphida | Amin (1985) | . | ICZN |
| Centroscyllium | Squaliformes | Nelson (2006) | . | ICZN |
| Centroscymnus | Squaliformes | Nelson (2006) | . | ICZN |
| Centroselachus | Squaliformes | Nelson (2006) | . | ICZN |
| Centrosema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Centrostachys | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Centrostegia | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Centrostigma | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Centunculus | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Centurio | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Cepedea | Opalinales | Delvinquier & Patterson (2000) | . | ICZN |
| Cepedella | Rhynchodida | Lynn (2008) | . | ICZN |
| Cepedietta | Astomatida | Lynn (2008) | . | ICZN |
| Cephalacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Cephalanthera | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cephalantheropsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cephalantholejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephalanthus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cephalaralia | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Cephalaria | Dipsacales | Mabberley (2008) | Caprifoliaceae. | ICBN |
| Cephalipterum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cephalocarpus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cephalocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Cephalocroton | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cephalocrotonopsis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cephalocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cephalocystis | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Cephalodasys | Macrodasyida | Hummon & Todaro (2010) | . | ICZN |
| Cephalodella | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Cephalodiscus | Cephalodiscida | Benito (1982) | Cephalodiscidae. | ICZN |
| Cephalofovea | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Cephalohibiscus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cephaloidophora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cephalojonesia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephalolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephalolobus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cephalomanes | Hymenophyllales | Christenhusz et al. (2011) | . | ICBN |
| Cephalomappa | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cephalomastax | Heteronemertea | Gibson (1995) | . | ICZN |
| Cephalomitrion | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephalopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cephalopentandra | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cephalophus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Cephalophyllum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Cephalopodum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cephalopterus | Passeriformes | Clements (2007) | . | ICZN |
| Cephalopyrus | Passeriformes | Clements (2007) | . | ICZN |
| Cephalorhizum | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Cephalorhyncha | Cyclorhagida | Adrianov & Malakhov (1999); Sørensen (2008) | . | ICZN |
| Cephalorhynchus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Cetacea. | ICZN |
| Cephaloscyllium | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Cephalosorus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cephalospatula | Haptorida | Lynn (2008) | . | ICZN |
| Cephalosphaera | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Cephalostachyum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cephalostemon | Poales | Mabberley (2008) | Rapateaceae. | ICBN |
| Cephalotaxus | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Cephalothamnium | | Adl et al. (2005) | Domain Eucarya - Phylum Euglenozoa - Class Kinetoplastea. | ICZN |
| Cephalothrix | Palaeonemertea | Gibson (1995); Kajihara et al. (2008) | . | ICZN |
| Cephalotomandra | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Cephalotrichella | Palaeonemertea | Gibson (1995); Kajihara et al. (2008) | Junior synonym of Cephalothrix. | ICZN |
| Cephalotrichium | Sporadotrichida | Lynn (2008) | Later synonym of Strobilidium?. | ICZN |
| Cephalotus | Oxalidales | Mabberley (2008) | Cephalotaceae. | ICBN |
| Cephalozia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephaloziella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephaloziopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cephalurichus | Heteronemertea | Gibson (1995) | . | ICZN |
| Cephalurus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Cephea | Rhizostomeae | Kramp (1961) | . | ICZN |
| Cepphus | Charadriiformes | Clements (2007) | . | ICZN |
| Ceradenia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Ceramium | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Ceraria | Caryophyllales | Mabberley (2008) | Didiereaceae. | ICBN |
| Cerasibacillus | Bacillales | Nakamura et al. (2004) | . | ICNB |
| Cerasicoccus | Puniceicoccales | Yoon et al. (2007) | . | ICNB |
| Cerastes | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Cerastium | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Ceratandra | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ceratiola | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Ceratiomyxa | Protosteliales | Olive (1975); Yamamoto (1998); Lado (2001); Lado et al. (2005) | . | ICBN |
| Ceratiomyxella | Protosteliales | Olive (1975) | . | ICBN |
| Ceratiosicyos | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Ceratium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Ceratobatrachus | Anura | Vitt & Caldwell (2009) | Ceratobatrachidae. | ICZN |
| Ceratobulimina | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ceratobuliminidae. | ICZN |
| Ceratobuliminoides | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ceratobuliminidae. | ICZN |
| Ceratocapnos | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Ceratocarpus | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Ceratocaryum | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Ceratocaulon | Alcyonacea | Bayer (1981) | Xeniidae. | ICZN |
| Ceratocentron | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ceratocephala | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Ceratochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ceratochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Ceratocnemum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Ceratocolax | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Ceratocorys | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Ceratocymba | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Ceratodictyon | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Ceratodon | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Ceratogymna | Coraciiformes | Clements (2007) | . | ICZN |
| Ceratogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Ceratolacis | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Ceratolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Ceratolimon | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Ceratolithus | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Ceratolithaceae. | ICBN |
| Ceratolobus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Ceratomyxa | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Ceratonia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Ceratoperidinium | Ptychodiscales | Fensome et al. (1993) | . | ICBN |
| Ceratopetalum | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Ceratophora | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Ceratophrys | Anura | Vitt & Caldwell (2009) | Ceratophryidae. | ICZN |
| Ceratophyllum | Ceratophyllales | Mabberley (2008) | Ceratophyllaceae. | ICBN |
| Ceratoporella | Agelasida | Vacelet (2002) | . | ICZN |
| Ceratopsion | Poecilosclerida | Hooper (2002) | . | ICZN |
| Ceratopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Ceratopyxis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ceratosanthes | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Ceratospathula | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Ceratospora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Ceratostema | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Ceratostigma | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Ceratostylis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ceratotheca | Lamiales | Mabberley (2008) | Pedaliaceae. | ICBN |
| Ceratotherium | Perissodactyla | McKenna & Bell (1997) | . | ICZN |
| Ceratotrocha | Bdelloida | Segers (2002); Segers (2007) | . | ICZN |
| Ceratotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Ceratozamia | Cycadales | Mabberley (2008); Christenhusz et al. (2011) | . | ICBN |
| Cerbaris | Halichondrida | Alvarez & Van Soest (2002) | . | ICZN |
| Cerbera | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cerberiopsis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cerberus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cercartetus | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Cercaspis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cercestis | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Cercibis | Ciconiiformes | Clements (2007) | . | ICZN |
| Cercidiphyllum | Saxifragales | Mabberley (2008) | Cercidiphyllaceae. | ICBN |
| Cercis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cercocarpus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Cercocebus | Primates | McKenna & Bell (1997) | . | ICZN |
| Cercococcyx | Cuculiformes | Clements (2007) | . | ICZN |
| Cercolophia | Squamata | Vitt & Caldwell (2009) | Amphisbaenidae. | ICZN |
| Cercomacra | Passeriformes | Clements (2007) | . | ICZN |
| Cercomela | Passeriformes | Clements (2007) | . | ICZN |
| Cercomonas | Cercomonadida | Karpov et al. (2006); Howe et al. (2009) | . | ICZN |
| Cercophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cercopithecus | Primates | McKenna & Bell (1997) | . | ICZN |
| Cercosaura | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Cercotrichas | Passeriformes | Clements (2007) | . | ICZN |
| Cerdia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Cerdocyon | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cerebratulides | Heteronemertea | Gibson (1995) | . | ICZN |
| Cerebratulina | Heteronemertea | Gibson (1995) | . | ICZN |
| Cerebratulus | Heteronemertea | Gibson (1995) | . | ICZN |
| Cerebrina | Lagenida | Patterson (1986); Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagenidae. | ICZN |
| Cerebrum | Astrorhizida | Kaminski (2000) | Komokiidae. | ICZN |
| Cerelasma | Psamminida | Gooday & Tendal (2000) | . | ICZN |
| Cerelpemma | Psamminida | Gooday & Tendal (2000) | . | ICZN |
| Cereopsis | Anseriformes | Clements (2007) | . | ICZN |
| Cereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Ceriantheomorpha | Ceriantharia | Tiffon (1987) | . | ICZN |
| Ceriantheopsis | Ceriantharia | Tiffon (1987) | . | ICZN |
| Cerianthula | Ceriantharia | Tiffon (1987) | . | ICZN |
| Cerianthus | Ceriantharia | Tiffon (1987) | . | ICZN |
| Cerinthe | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Ceriops | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Ceriscoides | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cerobertina | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Robertinidae. | ICZN |
| Cerochlamys | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Ceroctena | Cydippida | Carré & Carré (1991) | . | ICZN |
| Ceropegia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cerorhinca | Charadriiformes | Clements (2007) | . | ICZN |
| Cerosora | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Ceroxylon | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cerrophidion | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Certesella | Arcellinida | Meisterfeld (2000) | Difflugina -- Nebelidae. | ICZN |
| Certesia | Euplotida | Lynn (2008) | . | ICZN |
| Certhia | Passeriformes | Clements (2007) | . | ICZN |
| Certhiaxis | Passeriformes | Clements (2007) | . | ICZN |
| Certhidea | Passeriformes | Clements (2007) | . | ICZN |
| Certhilauda | Passeriformes | Clements (2007) | . | ICZN |
| Certhionyx | Passeriformes | Clements (2007) | . | ICZN |
| Ceruana | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cervantesia | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Cervaria | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cervera | Alcyonacea | López-González et al. (1995) | Cornulariidae. | ICZN |
| Cervicornia | Hadromerida | Rützler (2002) | . | ICZN |
| Cervus | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Ceryle | Coraciiformes | Clements (2007) | . | ICZN |
| Cesiribacter | Cytophagales | Srinivas et al. (2011) | . | ICNB |
| Cespedesia | Malpighiales | Mabberley (2008) | Ochnaceae. | ICBN |
| Cespitularia | Alcyonacea | Bayer (1981) | Xeniidae. | ICZN |
| Cestrum | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Cestum | Cestida | Harbison & Madin (1982) | . | ICZN |
| Cetobacterium | Fusobacteriales | Garrity et al. (2005) | . | ICNB |
| Cetorhinus | Lamniformes | Nelson (2006) | . | ICZN |
| Cettia | Passeriformes | Clements (2007) | . | ICZN |
| Ceuthmochares | Cuculiformes | Clements (2007) | . | ICZN |
| Ceuthocarpus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ceuthostoma | Fagales | Mabberley (2008) | Casuarinaceae. | ICBN |
| Ceuthotheca | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Cevallia | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Ceyx | Coraciiformes | Clements (2007) | . | ICZN |
| Chabanaudia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Chabrea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chacoa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chacophrys | Anura | Vitt & Caldwell (2009) | Ceratophryidae. | ICZN |
| Chadefaudiothrix | Tribonematales | Ettl (1978) | . | ICBN |
| Chadsia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chaenactis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chaenea | Haptorida | Lynn (2008) | . | ICZN |
| Chaenogaleus | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Chaenomeles | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Chaenorhinum | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Chaerephon | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Chaerophyllopsis | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chaerophyllum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chaeropus | Australidelphia | McKenna & Bell (1997) | . | ICZN |
| Chaetachme | Rosales | Mabberley (2008) | Cannabaceae. | ICBN |
| Chaetadelpha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chaetanthera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chaetanthus | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Chaetium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chaetobromus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chaetocalyx | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chaetocarpus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Chaetocauda | Rodentia | Holden (2005) | . | ICZN |
| Chaetocercus | Apodiformes | Clements (2007) | . | ICZN |
| Chaetocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chaetodipus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chaetodoryx | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Chaetoglena | Euglenales | Marin et al. (2003) | Synonymous to Trachelomonas. | ICBN |
| Chaetolepis | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Chaetolimon | Caryophyllales | Mabberley (2008) | Plumbaginaceae. | ICBN |
| Chaetomitriopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Chaetomitrium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Chaetomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chaetonotus | Chaetonotida | Balsamo et al. (2009); Hummon & Todaro (2010) | . | ICZN |
| Chaetonychia | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Chaetopappa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chaetopedia | Tribonematales | Ettl (1978) | . | ICBN |
| Chaetophractus | Xenarthra | McKenna & Bell (1997) | . | ICZN |
| Chaetophyllopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chaetopoa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chaetopogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chaetops | Passeriformes | Clements (2007) | . | ICZN |
| Chaetorhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Chaetornis | Passeriformes | Clements (2007) | . | ICZN |
| Chaetoseris | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chaetosphaeridium | Chaetosphaeridiales | Lewis & McCourt (2004); Finet et al. (2010) | . | ICBN |
| Chaetospira | Stichotrichida | Lynn (2008) | . | ICZN |
| Chaetostachydium | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chaetostoma | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Chaetotyphla | Euglenales | Marin et al. (2003) | Synonymous to Trachelomonas. | ICBN |
| Chaetura | Apodiformes | Clements (2007) | . | ICZN |
| Chaetymenia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chagasella | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Chaimarrornis | Passeriformes | Clements (2007) | . | ICZN |
| Chaiturus | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Chakravartiella | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Chalarodon | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Chalarodora | Gloeochaetales | Kies & Kremer (1986) | . | ICBN |
| Chalarothyrsus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chalcanthus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chalcides | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Chalcidoseps | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Chalcogorgia | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Chalcomitra | Passeriformes | Clements (2007) | . | ICZN |
| Chalcoparia | Passeriformes | Clements (2007) | . | ICZN |
| Chalcophaps | Columbiformes | Clements (2007) | . | ICZN |
| Chalcopsitta | Psittaciformes | Clements (2007) | . | ICZN |
| Chalcostigma | Apodiformes | Clements (2007) | . | ICZN |
| Chalema | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Chalepophyllum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chalicostroma | | Schneider & Wynne (2007) | . | ICBN |
| Chalinolobus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Chalinula | Haplosclerida | De Weerdt (2002) | . | ICZN |
| Chalkopyxis | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (no flagellate stage). | ICBN |
| Challengerella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rotaliidae. | ICZN |
| Challengeria | Phaeogromida | Takahashi & Anderson (2000) | . | ICZN |
| Challengeron | Phaeogromida | Takahashi & Anderson (2000) | . | ICZN |
| Chaltenobatrachus | Anura | Basso et al. (2011) | Ceratophryidae. | ICZN |
| Chalubinskia | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Chalybea | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Chalybura | Apodiformes | Clements (2007) | . | ICZN |
| Chamabainia | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Chamaea | Passeriformes | Clements (2007) | . | ICZN |
| Chamaeangis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chamaeanthus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chamaebatia | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Chamaebatiaria | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Chamaebotrys | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Chamaebryum | Gigaspermales | Goffinet et al. (2009) | . | ICBN |
| Chamaecalyx | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chamaechaenactis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chamaeclitandra | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Chamaecostus | Zingiberales | Mabberley (2008) | Costaceae. | ICBN |
| Chamaecrista | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chamaecyparis | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Chamaedaphne | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Chamaedorea | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Chamaegeron | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chamaegigas | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Chamaele | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chamaeleo | Squamata | Vitt & Caldwell (2009) | Chamaeleonidae. | ICZN |
| Chamaelirium | Liliales | Mabberley (2008) | Melanthiaceae. | ICBN |
| Chamaelycus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Chamaemeles | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Chamaemelum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chamaepentas | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chamaepetes | Galliformes | Clements (2007) | . | ICZN |
| Chamaepus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chamaeraphis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chamaerhodos | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Chamaerops | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Chamaesaracha | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Chamaesaura | Squamata | Vitt & Caldwell (2009) | Cordylidae. | ICZN |
| Chamaesciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chamaescilla | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Chamaesiphon | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Chamaesium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chamaesphacos | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Chamaethamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Chamaexeros | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Chamaeza | Passeriformes | Clements (2007) | . | ICZN |
| Chamarea | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chambeyronia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Chamelaucium | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Chamelophyton | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chameranthemum | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chamerion | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Chamguava | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Chamira | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chamissoa | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Chamissoniophila | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Chamorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Champereia | Santalales | Mabberley (2008) | Opiliaceae. | ICBN |
| Champia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Champiocolax | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Championia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Chandonanthus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chandrasekharania | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Changiostyrax | Ericales | Mabberley (2008) | Styracaceae. | ICBN |
| Changium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Changnienia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chanostoma | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Chantransia | | Schneider & Wynne (2007) | . | ICBN |
| Chaos | Euamoebida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Chapelieria | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chaperina | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Chapmanium | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Chapmannia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chaptalia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chara | Charales | McCourt et al. (1999) | . | ICBN |
| Characella | Astrophorida | Maldonado (2002) | . | ICZN |
| Characidiopsis | Heterogloeales | Ettl (1978) | . | ICBN |
| Characiopsis | Mischococcales | Ettl (1978) | . | ICBN |
| Charadrahyla | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Charadranaetes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Charadrius | Charadriiformes | Clements (2007) | . | ICZN |
| Charadrophila | Lamiales | Mabberley (2008) | Stilbaceae. | ICBN |
| Charalonema | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Chardezia | Tectofilosida | Meisterfeld (2000); Cavalier-Smith & Chao (2003) | Psammonobiotidae. | ICZN |
| Chardinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Charianthus | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Charina | Squamata | Vitt & Caldwell (2009) | Serpentes. Boidae. | ICZN |
| Charisea | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Charisella | Actiniaria | Fautin et al. (2007) | Junior homonym, but no replacement name was published. | ICZN |
| Charitospiza | Passeriformes | Clements (2007) | . | ICZN |
| Charmosyna | Psittaciformes | Clements (2007) | . | ICZN |
| Charonina | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Charonnautes | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Charpentiera | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Chartoloma | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chascanum | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Chascotheca | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Chaseella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chasiempis | Passeriformes | Clements (2007) | . | ICZN |
| Chasmanthe | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Chasmanthera | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Chasmanthium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chasmatophyllum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Chasmatostoma | Tetrahymenida | Lynn (2008) | Later synonym of Colpoda?. | ICZN |
| Chasmopodium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chassalia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chathamisis | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Chattonella | Raphidomonadales | Heywood & Leedale (2000) | . | ICBN |
| Chattonidium | Heterotrichida | Lynn (2008) | . | ICZN |
| Chaubardia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chaubardiella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chauliodon | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chauna | Anseriformes | Clements (2007) | . | ICZN |
| Chaunangium | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Chaunanthus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chaunochiton | Santalales | Mabberley (2008) | Olacaceae. | ICBN |
| Chaunoplectella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Chaunostoma | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Chauviniella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cheilanthes | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cheilanthopsis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cheiloclinium | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Cheilocostus | Zingiberales | Mabberley (2008) | Costaceae. | ICBN |
| Cheilolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cheilophyllum | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Cheiloplecton | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cheiloporidion | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cheilosa | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cheilosporum | Corallinales | Schneider & Wynne (2007); Wynne & Schneider (2010) | Later synonym of Jania. | ICBN |
| Cheilotheca | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cheilothela | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cheiradenia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cheiranthera | Apiales | Mabberley (2008) | Pittosporaceae. | ICBN |
| Cheiridopsis | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Cheirodendron | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Cheirogaleus | Primates | McKenna & Bell (1997) | . | ICZN |
| Cheiroglossa | Ophioglossales | Christenhusz et al. (2011) | . | ICBN |
| Cheirolaena | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cheirolophus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cheiromeles | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Cheiropleuria | Gleicheniales | Christenhusz et al. (2011) | . | ICBN |
| Cheirostylis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cheissinia | Thigmotrichida | Lynn (2008) | . | ICZN |
| Cheissiniophrya | Astomatida | Lynn (2008) | . | ICZN |
| Chelativorans | Rhizobiales | Doronina et al. (2010) | . | ICNB |
| Chelatobacter | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Chelatococcus | Rhizobiales | Garrity et al. (2005) | . | ICNB |
| Chelemys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chelictinia | Falconiformes | Clements (2007) | . | ICZN |
| Chelidonisis | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Chelidonium | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Chelidoptera | Galbuliformes | Clements (2007) | . | ICZN |
| Chelodina | Testudinata | Vitt & Caldwell (2009) | Chelidae. | ICZN |
| Chelonaplysilla | Dendroceratida | Bergquist & Cook (2002) | . | ICZN |
| Chelone | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Chelonia | Testudinata | Vitt & Caldwell (2009) | Cheloniidae. | ICZN |
| Chelonistele | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chelonobacter | Pasteurellales | Gregersen et al. (2009) | . | ICNB |
| Chelonoidis | Testudinata | Vitt & Caldwell (2009) | Testudinidae. | ICZN |
| Chelonopsis | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Chelophyes | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Chelosania | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Chelotropella | Astrophorida | Van Soest & Hooper (2002) | . | ICZN |
| Chelus | Testudinata | Vitt & Caldwell (2009) | Chelidae. | ICZN |
| Chelydra | Testudinata | Vitt & Caldwell (2009) | Chelydridae. | ICZN |
| Chelyocarpus | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Chelyorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chelyosoma | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Corellidae. | ICZN |
| Chen | Anseriformes | Clements (2007) | . | ICZN |
| Chengiopanax | Apiales | Shang & Huang (1993); Mabberley (2008) | Not "Chiengiopanax." Araliaceae. | ICBN |
| Chenia | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Chenonetta | Anseriformes | Clements (2007) | . | ICZN |
| Chenophrya | Endogenida | Lynn (2008) | . | ICZN |
| Chenopodiopsis | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Chenopodium | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Cheramoeca | Passeriformes | Clements (2007) | . | ICZN |
| Chersina | Testudinata | Vitt & Caldwell (2009) | Testudinidae. | ICZN |
| Chersodoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chersodromus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Chersomanes | Passeriformes | Clements (2007) | . | ICZN |
| Chersophilus | Passeriformes | Clements (2007) | . | ICZN |
| Chesneya | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chevaliera | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Chevalierella | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chevaliericrusta | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Chevreulia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chiangiodendron | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Chiarella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Chiasmocleis | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Chiastocaulon | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chibchanomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chichicaste | Cornales | Mabberley (2008) | Loasaceae. | ICBN |
| Chichkovia | | Bass et al. (2009) | Domain Eucarya - Rhizaria. | ICZN |
| Chidlowia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chigua | Cycadales | Mabberley (2008); Christenhusz et al. (2011) | Later synonym of Zamia. | ICBN |
| Chiharaea | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Chikusichloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Childia | Acoela | Dörjes (1968); Faubel & Noreña (2001) | . | ICZN |
| Childianea | Acoela | Hooge (2003) | . | ICZN |
| Chilenophrys | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Chileobryon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Chileranthemum | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chilia | Passeriformes | Clements (2007) | . | ICZN |
| Chiliadenus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chilianthus | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Chilineus | Heteronemertea | Gibson (1995) | . | ICZN |
| Chiliocephalum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chiliophyllum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chiliotrichiopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chiliotrichum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chilocardamum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chilocarpus | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Chilodina | Nassulida | Lynn (2008) | . | ICZN |
| Chilodochona | Exogemmida | Lynn (2008) | . | ICZN |
| Chilodonatella | Chlamydodontida | Lynn (2008) | . | ICZN |
| Chilodonella | Chlamydodontida | Lynn (2008) | . | ICZN |
| Chilodontopsis | Synhymeniida | Lynn (2008) | . | ICZN |
| Chiloglottis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chilogregarina | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Chilomastix | Retortamonadida | Brugerolle & Lee (2000) | . | ICZN |
| Chilomeniscus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Chilomitus | | Cepicka et al. (2010) | Domain Eucarya - Phylum Metamonada - Superclass Parabasalia. | ICZN |
| Chilomonas | Cryptomonadales | Clay et al. (1999); Hoef-Emden & Melkonian (2003); Novarino (2003) | Later synonym of Cryptomonas. | ICBN |
| Chilomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chilonatalus | Chiroptera | Simmons (2005) | . | ICZN |
| Chilophrya | Prorodontida | Lynn (2008) | . | ICZN |
| Chilopsis | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Chilorhinophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Atractaspididae. | ICZN |
| Chiloschista | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chiloscyllium | Orectolobiformes | Nelson (2006) | . | ICZN |
| Chiloscyphus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chilostomella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Chilostomellidae. | ICZN |
| Chilostomellina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nonionidae. | ICZN |
| Chilovora | Chilovorida | Cavalier-Smith & Chao (2004) | . | ICZN |
| Chimaera | Chimaeriformes | Nelson (2006) | . | ICZN |
| Chimaereicella | Sphingobacteriales | Tiago et al. (2006); Nedashkovskaya et al. (2007) | Later synonym of Algoriphaga. | ICNB |
| Chimantaea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chimaphila | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Chimarrhis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chimarrogale | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Chimonanthus | Laurales | Mabberley (2008) | Calycanthaceae. | ICBN |
| Chimonobambusa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chimonocalamus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chimonodinium | Peridiniales | Craveiro et al. (2011) | . | ICBN |
| Chinchilla | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chinchillula | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chinemys | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Chinostomum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Chiococca | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chioglossa | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Chionachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chionactis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Chionanthus | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Chione | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chioninia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Chionis | Charadriiformes | Clements (2007) | . | ICZN |
| Chionocharis | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Chionochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chionographis | Liliales | Mabberley (2008) | Melanthiaceae. | ICBN |
| Chionolaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chionoloma | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Chionomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chionopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chionophila | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Chionothrix | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Chiracanthia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Chiranthodendron | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Chirindia | Squamata | Vitt & Caldwell (2009) | Amphisbaenidae. | ICZN |
| Chirita | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Chiritopsis | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Chiroderma | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Chirodropus | Cubomedusae | Kramp (1961) | . | ICZN |
| Chirognathia | Bursovaginoidea | Sterrer & Sørensen (2006) | . | ICZN |
| Chiromantis | Anura | Vitt & Caldwell (2009) | Rhacophoridae. | ICZN |
| Chiromyscus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chironax | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Chironectes | Ameridelphia | McKenna & Bell (1997) | . | ICZN |
| Chironephthya | Alcyonacea | Williams (2000) | Nidaliidae. | ICZN |
| Chironex | Cubomedusae | Kramp (1961) | . | ICZN |
| Chironia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Chironius | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Chiropetalum | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Chiropodomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chiropotes | Primates | McKenna & Bell (1997) | . | ICZN |
| Chiropsalmus | Cubomedusae | Kramp (1961) | . | ICZN |
| Chiropsella | Cubomedusae | Gershwin (2006) | . | ICZN |
| Chiropsoides | Cubomedusae | Gershwin (2006) | . | ICZN |
| Chiropterotriton | Caudata | Vitt & Caldwell (2009) | Plethodontidae. | ICZN |
| Chiroxiphia | Passeriformes | Clements (2007) | . | ICZN |
| Chiruromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chisocheton | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Chitaspis | Coloniales | Emschermann (1972); Nielsen (1982) | Pedicellinidae. | ICZN |
| Chitinibacter | Neisseriales | Chern et al. (2004) | . | ICNB |
| Chitinilyticum | Neisseriales | Chang et al. (2007) | . | ICNB |
| Chitinimonas | Burkholderiales | Chang et al. (2004) | . | ICNB |
| Chitiniphilus | Neisseriales | Sato et al. (2009) | . | ICNB |
| Chitinivorax | | Chen et al. (2012) | Domain Bacteria - Phylum Proteobacteria - Class Betaproteobacteria. | ICNB |
| Chitinophaga | Sphingobacteriales | Garrity et al. (2005) | . | ICNB |
| Chitinosaccus | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Chitonanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Chitonella | Chlamydodontida | Lynn (2008) | . | ICZN |
| Chitonodytes | Chaetonotida | Balsamo et al. (2009) | . | ICZN |
| Chitra | Testudinata | Vitt & Caldwell (2009) | Trionychidae. | ICZN |
| Chlaenandra | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Chlaenosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chlamydacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chlamydaster | Pterocystida | Mikrjukov et al. (2000); Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Pterocystidae. | ICZN |
| Chlamydera | Passeriformes | Clements (2007) | . | ICZN |
| Chlamydia | Chlamydiales | Garrity et al. (2005) | . | ICNB |
| Chlamydocardia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chlamydocarya | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Chlamydochaera | Passeriformes | Clements (2007) | . | ICZN |
| Chlamydocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Chlamydodon | Chlamydodontida | Lynn (2008) | . | ICZN |
| Chlamydojatropha | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Chlamydomyxa | Chlamydomyxales | Cavalier-Smith & Chao (2006) | . | ICBN |
| Chlamydomyzium | Myzocytiopsidales | Dick (2001); Kirk et al. (2008) | Myzocytiopsidaceae. | ICBN |
| Chlamydonella | Chlamydodontida | Lynn (2008) | . | ICZN |
| Chlamydonellopsis | Chlamydodontida | Lynn (2008) | . | ICZN |
| Chlamydonyx | Dysteriida | Lynn (2008) | . | ICZN |
| Chlamydophila | Chlamydiales | Garrity et al. (2005) | . | ICNB |
| Chlamydophora | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chlamydophrys | Tectofilosida | Meisterfeld (2000); Cavalier-Smith & Chao (2003) | Chlamydophryidae. | ICZN |
| Chlamydophytum | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Chlamydosaurus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Chlamydoselachus | Hexanchiformes | Nelson (2006) | . | ICZN |
| Chlamydostachya | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chlamydotis | Gruiformes | Clements (2007) | . | ICZN |
| Chlamyphorus | Xenarthra | McKenna & Bell (1997) | . | ICZN |
| Chlidanthus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Chlidonias | Charadriiformes | Clements (2007) | . | ICZN |
| Chlidophyllon | Erythropeltidales | Schneider & Wynne (2007) | . | ICBN |
| Chloanthes | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Chloebia | Passeriformes | Clements (2007) | . | ICZN |
| Chloephaga | Anseriformes | Clements (2007) | . | ICZN |
| Chloracantha | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chloraea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chlorallanthus | Mischococcales | Ettl (1978); Silva (1979); Greuter et al. (1993) | Not "Chlorallantus" (Greuter et al., 1993), but Silva (1979) considered "Chlorallantus" may be correct spelling. | ICBN |
| Chloramoeba | Chloramoebales | Ettl (1978) | . | ICBN |
| Chloranthelia | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chloranthus | Chloranthales | Mabberley (2008) | Chloranthaceae. | ICBN |
| Chlorapion | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorarachnion | Chlorarachniales | Ishida et al. (2007); Ota et al. (2007) | . | ICBN |
| Chlorarkys | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorella | Chlorellales | Luo et al. (2009) | Chlorella clade in Chlorellaceae. | ICBN |
| Chlorellidiopsis | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorellidium | Mischococcales | Ettl (1978) | . | ICBN |
| Chloridella | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorinimonas | Raphidomonadales | Yamaguchi et al. (2010) | . | ICBN |
| Chloris | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chlorobaculum | Chlorobiales | Garrity et al. (2005) | . | ICNB |
| Chlorobium | Chlorobiales | Garrity et al. (2005) | . | ICNB |
| Chlorobotrys | Eustigmatales | Hibberd (1981) | . | ICBN |
| Chlorocalymma | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chlorocardium | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Chlorocarpa | Malpighiales | Mabberley (2008) | Achariaceae. | ICBN |
| Chlorocebus | Primates | Groves (2005) | . | ICZN |
| Chloroceryle | Coraciiformes | Clements (2007) | . | ICZN |
| Chlorocharis | Passeriformes | Clements (2007) | . | ICZN |
| Chlorochorion | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chlorochrysa | Passeriformes | Clements (2007) | . | ICZN |
| Chlorocichla | Passeriformes | Clements (2007) | . | ICZN |
| Chlorocloster | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorocrambe | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chlorodesmos | Synurales | Kristiansen & Preisig (2001) | Synuraceae. | ICBN |
| Chloroflexus | Chloroflexales | Garrity et al. (2005) | . | ICNB |
| Chlorogalum | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Chlorogibba | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorogloea | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chlorogloeopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Chloroherpeton | Chlorobiales | Garrity et al. (2005) | . | ICNB |
| Chloroidium | | Darienko et al. (2010) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. Watanabea-clade. | ICBN |
| Chlorokardion | Chloramoebales | Ettl (1978) | . | ICBN |
| Chlorokoryne | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorokybus | Chlorokybales | Rogers et al. (1980) | . | ICBN |
| Chloroleucon | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chlorolius | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Chloromeson | Chloramoebales | Ettl (1978) | . | ICBN |
| Chloromyxum | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Chloronema | Chloroflexales | Garrity et al. (2005) | . | ICNB |
| Chloroparva | Chlorellales | Somogyi et al. (2011) | As Nannochloris-like clade. | ICBN |
| Chloropedia | Mischococcales | Ettl (1978) | . | ICBN |
| Chloropeta | Passeriformes | Clements (2007) | . | ICZN |
| Chlorophanes | Passeriformes | Clements (2007) | . | ICZN |
| Chlorophonia | Passeriformes | Clements (2007) | . | ICZN |
| Chlorophytum | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Chloropipo | Passeriformes | Clements (2007) | . | ICZN |
| Chloropsis | Passeriformes | Clements (2007) | . | ICZN |
| Chlorornis | Passeriformes | Clements (2007) | . | ICZN |
| Chlorosaccus | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorospatha | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Chlorospingus | Passeriformes | Clements (2007) | . | ICZN |
| Chlorostilbon | Apodiformes | Clements (2007) | . | ICZN |
| Chlorotalpa | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Chrysochloridea. | ICZN |
| Chlorothecium | Mischococcales | Ettl (1978) | . | ICBN |
| Chlorothraupis | Passeriformes | Clements (2007) | . | ICZN |
| Chloroxylon | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Choanocystis | Pterocystida | Mikrjukov et al. (2000); Cavalier-Smith & von der Heyden (2007); Yabuki et al. (2012) | Choanocystidae. | ICZN |
| Choanocystoides | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Choanoeca | Craspedida | Leadbeater & Thomsen (2000) | . | ICZN |
| Choanophrya | Endogenida | Lynn (2008) | . | ICZN |
| Choanostoma | Haptorida | Lynn (2008) | . | ICZN |
| Chodsigoa | Soricomorpha | Hutterer (2005) | . | ICZN |
| Choeroniscus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Choeronycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Choerophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Choerospondias | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Choisya | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Cholamonas | | Cavalier-Smith et al. (2008); Howe et al. (2009); Cavalier-Smith et al. (2009) | Domain Eucarya - Phylum Cercozoa. Sainouroidea; Sainouroidae. | ICZN |
| Choleoeimeria | Eucoccidiorida | Jirků et al. (2002) | . | ICZN |
| Choloepus | Xenarthra | McKenna & Bell (1997) | . | ICZN |
| Chomelia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Chondestes | Passeriformes | Clements (2007) | . | ICZN |
| Chondracanthus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Chondradenia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chondranthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Chondria | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Chondriella | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Chondrilla | Chondrosida | Boury-Esnault (2002) | . | ICZN |
| Chondrilla | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chondriolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chondrocladia | Poecilosclerida | Hajdu & Vacelet (2002) | . | ICZN |
| Chondrocystis | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chondrodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Chondrodapis | Astrorhizida | Kaminski (2000) | Baculellidae. | ICZN |
| Chondrodendron | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Chondrogloea | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Chondrohierax | Falconiformes | Clements (2007) | . | ICZN |
| Chondromyces | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Chondrophellia | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Chondrophycus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Chondropsis | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Chondropyxis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chondrorhyncha | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chondroscaphe | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chondrosia | Chondrosida | Boury-Esnault (2002) | . | ICZN |
| Chondrostylis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Chondrus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Chondrymenia | Plocamiales | Schneider & Wynne (2007) | . | ICBN |
| Chonecolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Chonelasma | Hexactinosida | Reiswig & Wheeler (2002) | . | ICZN |
| Chonemonas | Euglenales | Marin et al. (2003) | Synonymous to Trachelomonas. | ICBN |
| Chonemorpha | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Chonocentrum | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Chonopetalum | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Chonosaurus | Cryptogemmida | Lynn (2008) | . | ICZN |
| Chordeiles | Caprimulgiformes | Clements (2007) | . | ICZN |
| Chordifex | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Chordodasiopsis | Macrodasyida | Hummon & Todaro (2010) | . | ICZN |
| Chordodes | Gordioidea | Schmidt-Rhaesa (2002); Poinar Jr. (2008) | . | ICZN |
| Chordodiolus | Gordioidea | Schmidt-Rhaesa (2002); Poinar Jr. (2008) | Junior synonym of Beatogordius. | ICZN |
| Choreocolax | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Choreonema | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Choretrum | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Choriactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Choriantha | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Choricarpia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Choriceras | Malpighiales | Mabberley (2008) | Picrodendraceae. | ICBN |
| Chorigyne | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Chorilaena | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Choriptera | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Chorisepalum | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Chorisis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chorisiva | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chorisochora | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chorisodontium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Chorispora | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Choristylis | Saxifragales | Mabberley (2008) | Grossulariaceae. | ICBN |
| Choritaenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chorizandra | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Chorizanthe | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Chorizema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chorizocarpa | Stolidobranchia | Monniot & Monniot (1972) | Styelidae. | ICZN |
| Chortolirion | Asparagales | Mabberley (2008) | Asphodelaceae. | ICBN |
| Chorycystis | | Letsch et al. (2009); Darienko et al. (2010) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. Chorycystis-clade. | ICBN |
| Chouxia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Chresta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Christensenella | Clostridiales | Morotomi et al. (2012) | . | ICNB |
| Christensenia | Marattiales | Christenhusz et al. (2011) | . | ICBN |
| Christensonia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Christia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Christiana | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Christinus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Christiopteris | Polypodiales | Farr et al. (1979); Mabberley (2008); Christenhusz et al. (2011) | Orthographic variant of "Christopteris". | ICBN |
| Christisonia | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Christolea | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Christopteris | Polypodiales | Farr et al. (1979); Mabberley (2008); Christenhusz et al. (2011) | Not "Christiopteris". | ICBN |
| Chroeomys | Rodentia | McKenna & Bell (1997); Musser & Carleton (2005) | Later synonym of Abrohrix. | ICZN |
| Chroesthes | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Chromatium | Chromatiales | Garrity et al. (2005) | . | ICNB |
| Chromatocurvus | | Csotonyi et al. (2011) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. Originally spelled as "Chromocurvus" (see Validation list no. 145). | ICNB |
| Chromatonema | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Chromera | | Moore et al. (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Chromerida. | ICZN |
| Chromidina | Astomatophorida | Lynn (2008) | . | ICZN |
| Chromobacterium | Neisseriales | Garrity et al. (2005) | . | ICNB |
| Chromocurvus | | Csotonyi et al. (2011) | Original but ncorrect spelling of Chromatocurvus. | ICNB |
| Chromohalobacter | Oceanospirillales | Garrity et al. (2005) | . | ICNB |
| Chromolaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chromolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chromolucuma | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Chromophyton | Hibberdiales | Kristiansen & Preisig (2001) | Hibberdiaceae. | ICBN |
| Chromulina | Chromulinales | Kristiansen & Preisig (2001) | Chromulinaceae (uniflagellate). | ICBN |
| Chroniochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chronopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chroococcidiopsis | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chroococcidium | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chroococcopsis | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chroococcus | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Chroodactylon | Stylonematales | Schneider & Wynne (2007) | . | ICBN |
| Chroomonas | Pyrenomonadales | Clay et al. (1999); Novarino (2003) | . | ICBN |
| Chroothece | Stylonematales | Schneider & Wynne (2007) | . | ICBN |
| Chrotogale | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Chrotomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Chrotopterus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Chrozophora | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Chrysactinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysactinium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysalidinella | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Reussellidae. | ICZN |
| Chrysalogonium | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nodosariidae. | ICZN |
| Chrysamoeba | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (uniflagellate). | ICBN |
| Chrysanthellum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysanthemoides | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysanthemum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysanthoglossom | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysaora | Semaeostomeae | Kramp (1961) | . | ICZN |
| Chrysapion | Phaeothamniales | Bailey et al. (1998) | . | ICBN |
| Chrysapsis | Chromulinales | Kristiansen & Preisig (2001) | Chromulinaceae (uniflagellate). | ICBN |
| Chrysarachnion | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (no flagellate stage). | ICBN |
| Chrysemys | Testudinata | Vitt & Caldwell (2009) | Emydidae. | ICZN |
| Chryseobacterium | Flavobacteriales | Garrity et al. (2005) | . | ICNB |
| Chryseoglobus | Micrococcales | Baik et al. (2010); Ludwig et al. (2012) | Microbacteriaceae. | ICNB |
| Chryseomicrobium | Bacillales | Arora et al. (2011) | . | ICNB |
| Chryseomonas | Pseudomonadales | Garrity et al. (2005) | . | ICNB |
| Chrysidiastrum | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (no flagellate stage). | ICBN |
| Chrysiogenes | Chrysiogenales | Garrity et al. (2005) | . | ICNB |
| Chrysitrix | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Chrysoamphipyxis | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysoamphitrema | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysoarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Chrysobalanus | Malpighiales | Mabberley (2008) | Chrysobalanaceae. | ICBN |
| Chrysobatrachus | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Chrysoblastella | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Chrysobotriella | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Chrysocampanula | Prymnesiales | Jordan et al. (2004) | Prymnesiaceae. | ICBN |
| Chrysocapsa | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (uniflagellate). | ICBN |
| Chrysocapsella | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (biflagellate). | ICBN |
| Chrysocephalum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysochamela | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Chrysochlamys | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Chrysochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chrysochloris | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Chrysochloridea. | ICZN |
| Chrysochromulina | Prymnesiales | Edvardsen et al. (2000); Jordan et al. (2004) | Prymnesiaceae. | ICBN |
| Chrysocladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Chrysoclonium | Phaeothamniales | Bailey et al. (1998) | . | ICBN |
| Chrysococcus | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (uniflagellate). | ICBN |
| Chrysococcyx | Cuculiformes | Clements (2007) | . | ICZN |
| Chrysocolaptes | Piciformes | Clements (2007) | . | ICZN |
| Chrysocoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysocrinus | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysoculter | | Nakayama et al. (2005) | Eucarya - Haptophyta - Prymnesiophyceae - Incertae sedis - Chrysoculteraceae. | ICBN |
| Chrysocycnis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chrysocyon | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Chrysocystis | Sarcinochrysidales | Andersen & Preisig (2000) | . | ICBN |
| Chrysodendron | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Chrysoderma | Chrysomeridales | Preisig (1995); Kristiansen & Preisig (2001) | Nomen nudum. | ICBN |
| Chrysodictyon | Phaeothamniales | Bailey et al. (1998) | . | ICBN |
| Chrysodidymus | Synurales | Kristiansen & Preisig (2001) | Synuraceae. | ICBN |
| Chrysoela | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Chrysoglossum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chrysogonum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysogorgia | Alcyonacea | Bayer (1981) | Chrysogorgiidae. | ICZN |
| Chrysogrammitis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Chryso-hypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Chrysolaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysolampis | Apodiformes | Clements (2007) | . | ICZN |
| Chrysolepidomonas | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysolepidomonadaceae. | ICBN |
| Chrysolepis | Fagales | Mabberley (2008) | Fagaceae. | ICBN |
| Chrysolophus | Galliformes | Clements (2007) | . | ICZN |
| Chrysolykos | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (biflagellate). | ICBN |
| Chrysoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysomeris | Chrysomeridales | Preisig (1995) | . | ICBN |
| Chrysomma | Passeriformes | Clements (2007) | . | ICZN |
| Chrysomus | Passeriformes | Clements (2007) | . | ICZN |
| Chrysonebula | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006); Andersen (2007) | Based on the molecular phylogeny (Andersen, 2007). Hydruraceae (Kristiansen & Preisig, 2001). | ICBN |
| Chrysonema | | Kristiansen & Preisig (2001) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta. | ICBN |
| Chrysonephele | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Chrysonephos | Sarcinochrysidales | Preisig (1995); Andersen & Preisig (2000) | . | ICBN |
| Chrysopaa | Anura | Vitt & Caldwell (2009) | Dicroglossidae. | ICZN |
| Chrysopathes | Antipatharia | Opresko (2003) | . | ICZN |
| Chrysopelea | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Chrysophaeum | | Andersen & Preisig (2000) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta - Class Pelagophyceae. Affiliation uncertain. | ICBN |
| Chrysophthalmum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysophyllum | Ericales | Mabberley (2008) | Sapotaceae. | ICBN |
| Chrysopodocystis | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysopogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chrysopora | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (uniflagellate). | ICBN |
| Chrysoprenanthes | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysopyxis | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysoreinhardia | Sarcinochrysidales | Andersen & Preisig (2000) | . | ICBN |
| Chrysosaccus | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (no flagellate stage). | ICBN |
| Chrysoscias | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Chrysospalax | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Chrysochloridea. | ICZN |
| Chrysosphaera | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysosphaeraceae (uniflagellate). | ICBN |
| Chrysosphaerella | Paraphysomonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Paraphysomonadaceae. | ICBN |
| Chrysosplenium | Saxifragales | Mabberley (2008) | Saxifragaceae. | ICBN |
| Chrysostephanosphaera | Chromulinales | Kristiansen & Preisig (2001) | Chrysamoebaceae (uniflagellate). | ICBN |
| Chrysothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chrysothecium | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Chrysothecopsis | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysothemis | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Chrysothlypis | Passeriformes | Clements (2007) | . | ICZN |
| Chrysothylakion | Hibberdiales | Kristiansen & Preisig (2001) | Stylococcaceae. | ICBN |
| Chrysotila | Isochrysidales | Jordan et al. (2004) | Isochrysidaceae. | ICBN |
| Chrysotilos | Hibberdiales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chrysocapsaceae (uniflagellate). | ICBN |
| Chrysowaernella | Chrysomeridales | Preisig (1995) | . | ICBN |
| Chrysoxys | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Chrysuronia | Apodiformes | Clements (2007) | . | ICZN |
| Chrysymenia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Chthonerpeton | Gymnophiona | Vitt & Caldwell (2009) | Typhlonectidae. | ICZN |
| Chthonocephalus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chthonomonas | Chthonomonadales | Lee et al. (2011) | . | ICNB |
| Chuanminshen | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chucoa | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Chukrasia | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Chunella | Pennatulacea | Williams (1995) | . | ICZN |
| Chunga | Gruiformes | Clements (2007) | . | ICZN |
| Chungangia | Bacillales | Kim et al. (2012) | . | ICNB |
| Chunia | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Chunianna | Pelagica | Gibson (1995) | . | ICZN |
| Chuniella | Pelagica | Gibson (1995) | . | ICZN |
| Chuniophoenix | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Chuniphyes | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Chunopleura | Appendicularia | Fenaux (1998) | . | ICZN |
| Chuquiraga | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Churamiti | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Chusquea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Chusua | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chydenanthus | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Chylismia | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Chylismiella | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Chylocladia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Chymsydia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Chysis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Chytranthus | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Chytridiochloris | Mischococcales | Ettl (1978) | . | ICBN |
| Chytridiopsis | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Chytriodinium | | Fensome et al. (1993); Skovgaard et al. (2007) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. Former Blastodiniales. | ICBN |
| Chytroglossa | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Ciallusia | Phlebobranchia | Monniot & Monniot (1972); Kott (2008) | Junior synonym of Pterygascidia. | ICZN |
| Cibicicoides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Cibicides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Cibicidina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Cibicidinella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Cibicidoides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Parrelloididae. | ICZN |
| Cibirhiza | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cibotium | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Ciccaba | Strigiformes | Clements (2007) | . | ICZN |
| Cicendia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Cicer | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Ciceronia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cichladusa | Passeriformes | Clements (2007) | . | ICZN |
| Cichlidotherus | Clevelandellida | Lynn (2008) | . | ICZN |
| Cichllherminia | Passeriformes | Clements (2007) | . | ICZN |
| Cichlocolaptes | Passeriformes | Clements (2007) | . | ICZN |
| Cichlopsis | Passeriformes | Clements (2007) | . | ICZN |
| Cichorium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cicinnurus | Passeriformes | Clements (2007) | . | ICZN |
| Ciconia | Ciconiiformes | Clements (2007) | . | ICZN |
| Cicuta | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cienfuegosia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cienkowskya | Desmothoracida | Mikrjukov et al. (2000); Adl et al. (2005) | Clathrulinidae. | ICZN |
| Cigarrilla | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ciliatomyces | | Dick (2001); Kirk et al. (2008) | Domain Eucarya - Kingdom Straminipila - Phylum Oomycota. Lagenaceae. | ICBN |
| Ciliatosporidium | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Ciliocincta | Orthonectida | Kozloff (1992) | . | ICZN |
| Ciliofaurea | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Karyorelictea. | ICZN |
| Ciliophrys | Rhizochromulinales | Moestrup (2000); Sekiguchi et al. (2003); Edvardsen et al. (2007) | . | ICBN |
| Ciliosemina | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Ciliospina | Choreotrichida | Lynn (2008) | nomen dubium. | ICZN |
| Cinachyra | Spirophorida | Van Soest & Rützler (2002) | . | ICZN |
| Cinachyrella | Spirophorida | Van Soest & Rützler (2002) | . | ICZN |
| Cinchona | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cinchonopsis | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cincinnobotrys | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Cinclidium | Bryales | Goffinet et al. (2009) | . | ICBN |
| Cinclidium | Passeriformes | Clements (2007) | . | ICZN |
| Cinclidonemertes | | Crandall (2010) | Domain Eucarya - Kingdom Animalia - Phylum Nemertea - Class Holonemertea. Now checking. | ICZN |
| Cinclidotus | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Cinclocerthia | Passeriformes | Clements (2007) | . | ICZN |
| Cinclodes | Passeriformes | Clements (2007) | . | ICZN |
| Cincloramphus | Passeriformes | Clements (2007) | . | ICZN |
| Cinclosoma | Passeriformes | Clements (2007) | . | ICZN |
| Cinclus | Passeriformes | Clements (2007) | . | ICZN |
| Cineraria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cinetidomyxa | | Bass et al. (2009) | Domain Eucarya - Rhizaria. | ICZN |
| Cinetochilum | Philasterida | Lynn (2008) | . | ICZN |
| Cinetoconia | Sporadotrichida | Lynn (2008) | nomen dubium. | ICZN |
| Cinetozona | Philasterida | Lynn (2008) | . | ICZN |
| Cinna | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cinnadenia | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Cinnamodendron | Canellales | Mabberley (2008) | Canellaceae. | ICBN |
| Cinnamomum | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Cinnamosma | Canellales | Mabberley (2008) | Canellaceae. | ICBN |
| Cinnycerthia | Passeriformes | Clements (2007) | . | ICZN |
| Cinnyricinclus | Passeriformes | Clements (2007) | . | ICZN |
| Cinnyris | Passeriformes | Clements (2007) | . | ICZN |
| Ciocalapata | Halichondrida | Erpenbeck & Van Soest (2002) | . | ICZN |
| Ciocalypta | Halichondrida | Erpenbeck & Van Soest (2002) | . | ICZN |
| Ciona | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Cionidae. | ICZN |
| Cionosicyos | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cipadessa | Sapindales | Mabberley (2008) | Meliaceae. | ICBN |
| Cipocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Cipoia | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Cipura | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Circaea | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Circaeaster | Ranunculales | Mabberley (2008) | Circaeasteraceae. | ICBN |
| Circaetus | Falconiformes | Clements (2007) | . | ICZN |
| Circandra | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Circinella | Stichotrichida | Lynn (2008) | . | ICZN |
| Circinisis | Alcyonacea | Bayer (1981) | Isididae. | ICZN |
| Circodinium | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Circoporus | Phaeocalpida | Takahashi & Anderson (2000) | . | ICZN |
| Circospathis | Phaeocalpida | Takahashi & Anderson (2000) | . | ICZN |
| Circus | Falconiformes | Clements (2007) | . | ICZN |
| Cirranter | Armophorida | Lynn (2008) | . | ICZN |
| Cirrhaea | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cirrhigaleus | Squaliformes | Nelson (2006) | . | ICZN |
| Cirrhipathes | Antipatharia | Bo et al. (2009) | "110608". | ICZN |
| Cirrhitiara | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cirrholovenia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cirrhoscyllium | Orectolobiformes | Nelson (2006) | . | ICZN |
| Cirrigregarina | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cirriphyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cirrophrya | Cyrtolophosidida | Lynn (2008) | . | ICZN |
| Cirrophrya | Platyophryida | Lynn (2008); Foissner et al. (2011) | . | ICZN |
| Cirrulicarpus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Cirsium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cischweinfia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cissa | Passeriformes | Clements (2007) | . | ICZN |
| Cissampelopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cissampelos | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Cissopis | Passeriformes | Clements (2007) | . | ICZN |
| Cissus | Vitales | Mabberley (2008) | Vitaceae. | ICBN |
| Cistanche | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Cistanthe | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Cisticola | Passeriformes | Clements (2007) | . | ICZN |
| Cistothorus | Passeriformes | Clements (2007) | . | ICZN |
| Cistugo | Chiroptera | Simmons (2005) | . | ICZN |
| Cistus | Malvales | Mabberley (2008) | Cistaceae. | ICBN |
| Cithareloma | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Citharexylum | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Citharistes | Dinophysiales | Fensome et al. (1993) | . | ICBN |
| Citreicella | Rhodobacterales | Sorokin et al. (2005) | . | ICNB |
| Citreimonas | Rhodobacterales | Choi & Cho (2006) | . | ICNB |
| Citricoccus | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Citrobacter | Enterobacteriales | Garrity et al. (2005) | . | ICNB |
| Citronella | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Citronia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Citropsis | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Citrullus | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Citrus | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Cittura | Coraciiformes | Clements (2007) | . | ICZN |
| Civettictis | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cladacanthella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cladactella | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cladangia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Cladanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cladastomum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Claderia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cladhymenia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cladiella | Alcyonacea | Bayer (1981) | Alcyoniidae. | ICZN |
| Cladium | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cladocarpoides | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cladocarpus | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cladoceras | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cladochaeta | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cladococcus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Cladocolea | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Cladocora | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Cladocoryne | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cladocroce | Haplosclerida | De Weerdt (2002) | . | ICZN |
| Cladodonta | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cladogelonium | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cladogynos | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cladolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cladomnion | Ptychomniales | Goffinet et al. (2009) | . | ICBN |
| Cladomniopsis | Ptychomniales | Goffinet et al. (2009) | . | ICBN |
| Cladomyza | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Cladonema | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cladonema | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Cladopathes | Antipatharia | Opresko (2003) | . | ICZN |
| Cladophascum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cladopodanthus | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cladopodiella | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cladopsammia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Cladopus | Malpighiales | Mabberley (2008) | Podostemaceae. | ICBN |
| Cladopyxis | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Cladoraphis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cladorhiza | Poecilosclerida | Hajdu & Vacelet (2002) | . | ICZN |
| Cladorhynchus | Charadriiformes | Clements (2007) | . | ICZN |
| Clados | Astrorhizida | Kaminski (2000) | Astrorhizinae. | ICZN |
| Cladosarsia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cladostemon | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Cladothenea | Astrophorida | Maldonado (2002) | . | ICZN |
| Cladotricha | Stichotrichida | Lynn (2008) | . | ICZN |
| Cladrastis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cladurus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Clamator | Cuculiformes | Clements (2007) | . | ICZN |
| Clandarium | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Clangula | Anseriformes | Clements (2007) | . | ICZN |
| Claopodium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Claoxylon | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Claoxylopsis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Clappertonia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Clappia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Claravis | Columbiformes | Clements (2007) | . | ICZN |
| Claria | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Clarisia | Rosales | Mabberley (2008) | Moraceae. | ICBN |
| Clarkeasia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Clarkella | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Clarkia | Myrtales | Mabberley (2008) | Onagraceae. | ICBN |
| Clasmatocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Clasmatodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Clastidium | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Clastobryella | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Clastobryophilum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Clastobryopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Clastobryum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Clastoderma | Echinosteliales | Yamamoto (1998) | . | ICBN |
| Clastopus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Clastostelium | Protosteliales | Olive & Stoianovitch (1977) | . | ICBN |
| Clathraria | Alcyonacea | Bayer (1981) | Melithaeidae. | ICZN |
| Clathrella | | Bass et al. (2009); Özdikmen (2009) | Junior homonym. Substituted by Ozdikmenella. | ICZN |
| Clathria | Poecilosclerida | Hooper (2002) | . | ICZN |
| Clathrina | Clathrinida | Borojevic et al. (2002) | . | ICZN |
| Clathrocanium | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Clathrochone | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Clathrocorys | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Clathrocyclas | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Clathromorphum | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Clathrostoma | Peniculida | Lynn (2008) | . | ICZN |
| Clathrotropis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Clathrozoella | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Clathrozoon | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Clathrulina | Desmothoracida | Mikrjukov et al. (2000); Adl et al. (2005) | Clathrulinidae. | ICZN |
| Claudea | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Claudenus | Stolidobranchia | Kott (1998) | Pyuridae. | ICZN |
| Claudius | Testudinata | Vitt & Caldwell (2009) | Dermatemydidae. | ICZN |
| Clausena | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Clausia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Clausilocola | Astomatida | Lynn (2008) | . | ICZN |
| Clausognathia | Bursovaginoidea | Sørensen (2002) | . | ICZN |
| Clausophyes | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Clausospicula | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Claustrofolliculina | Heterotrichida | Lynn (2008) | . | ICZN |
| Claustrosporidium | Claustrosporida | Bass et al. (2009) | . | ICZN |
| Clautriavia | | Howe et al. (2011) | Domain Eucarya - Phylum Cercozoa - Class Imbricatea. | ICZN |
| Clava | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Clavactinia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Clavarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Clavatorella | Globigerinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Globorotaliidae. | ICZN |
| Clavelina | Aplousobranchia | Monniot & Monniot (1972); Kott (1998); Monniot (2001) | Clavelinidae. | ICZN |
| Clavibacter | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Clavicephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Claviclonium | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Clavija | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Claviscopulia | Hexactinosida | Reiswig (2002) | . | ICZN |
| Clavitheca | Funariales | Goffinet et al. (2009) | . | ICBN |
| Clavoplites | Haptorida | Lynn (2008) | . | ICZN |
| Clavularia | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Clavulina | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Valvulinidae. | ICZN |
| Claytonia | Caryophyllales | Mabberley (2008) | Portulacaceae. | ICBN |
| Cleaveius | Echinorhynchida | Amin (1985) | . | ICZN |
| Cleghornia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cleidiocarpon | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cleidion | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cleisocentron | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cleisomeria | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cleisostoma | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cleistachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cleistanthus | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Cleistes | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cleistocactus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Cleistocarpidium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cleistochlamys | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cleistochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cleistogenes | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cleistopetalum | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cleistopholis | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Clelia | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Clematepistephium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Clematicissus | Vitales | Mabberley (2008) | Vitaceae. | ICBN |
| Clematis | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Clematoclethra | Ericales | Mabberley (2008) | Actinidiaceae. | ICBN |
| Clemensiella | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Clemmys | Testudinata | Vitt & Caldwell (2009) | Emydidae. | ICZN |
| Cleobulia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cleoma | Brassicales | Mabberley (2008) | Cleomaceae. | ICBN |
| Cleomella | Brassicales | Mabberley (2008) | Cleomaceae. | ICBN |
| Cleonia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cleptornis | Passeriformes | Clements (2007) | . | ICZN |
| Cleretum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Clermontia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Clerodendrum | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Clethra | Ericales | Mabberley (2008) | Clethraceae. | ICBN |
| Clethrionomys | Rodentia | McKenna & Bell (1997); Musser & Carleton (2005) | Later synonym of Myodes. | ICZN |
| Clevea | Tintinnida | Lynn (2008) | . | ICZN |
| Clevelandella | Clevelandellida | Lynn (2008) | . | ICZN |
| Clevelandina | Spirochaetales | Garrity et al. (2005) | . | ICNB |
| Cleyera | Ericales | Mabberley (2008) | Pentaphylacaceae. | ICBN |
| Clianthus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Clibadium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Clibanornis | Passeriformes | Clements (2007) | . | ICZN |
| Clidemia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Cliffortia | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Cliftonaea | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cliftonia | Ericales | Mabberley (2008) | Cyrillaceae. | ICBN |
| Climacium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Climacocodon | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Climacocylis | Tintinnida | Lynn (2008) | . | ICZN |
| Climacostomum | Heterotrichida | Lynn (2008) | . | ICZN |
| Climacteris | Passeriformes | Clements (2007) | . | ICZN |
| Clinacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Clinanthus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Clinopodium | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Clinosperma | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Clinostigma | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Clinotarsus | Anura | Vitt & Caldwell (2009) | Ranidae. | ICZN |
| Clintonia | Liliales | Mabberley (2008) | Liliaceae. | ICBN |
| Cliona | Hadromerida | Rützler (2002) | . | ICZN |
| Clionaopsis | Hadromerida | Rützler (2002) | . | ICZN |
| Cliothosa | Hadromerida | Rützler (2002) | . | ICZN |
| Clistax | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Clistolagenophrys | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Clitandra | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Clitellocephalus | Eugregarinorida | Clopton & Nolte (2002) | . | ICZN |
| Clitoria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Clitoriopsis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Clivia | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Cloacibacillus | Synergistales | Ganesan et al. (2008); Jumas-Bilak et al. (2009) | . | ICNB |
| Cloacibacterium | Flavobacteriales | Allen et al. (2006) | . | ICNB |
| Cloeotis | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Cloezia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Cloiselia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Clonodia | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Clonophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Closteriopsis | Chlorellales | Krienitz et al. (2010) | Parachlorella clade in Chlorellaceae. | ICBN |
| Closterium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Clostridiisalibacter | Clostridiales | Liebgott et al. (2008) | . | ICNB |
| Clostridium | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Clowesia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Clusia | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Clusiella | Malpighiales | Mabberley (2008) | Guttiferae. | ICBN |
| Clutia | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Clydonella | Vannellida | Rogerson & Patterson (2000); Smirnov et al. (2005) | . | ICZN |
| Clymene | Bangiales | Sutherland et al. (2011) | . | ICBN |
| Clyomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Clypeola | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Clypeolina | Tectofilosida | Meisterfeld (2000); Cavalier-Smith & Chao (2003) | Chlamydophryidae. | ICZN |
| Clytia | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Clytoceyx | Coraciiformes | Clements (2007) | . | ICZN |
| Clytoctantes | Passeriformes | Clements (2007) | . | ICZN |
| Clytolaema | Apodiformes | Clements (2007) | . | ICZN |
| Clytomyias | Passeriformes | Clements (2007) | . | ICZN |
| Clytorhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Clytospiza | Passeriformes | Clements (2007) | . | ICZN |
| Cnemarchus | Passeriformes | Clements (2007) | . | ICZN |
| Cnemaspis | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Cnemidocarpa | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Styelidae. | ICZN |
| Cnemidophorus | Squamata | Vitt & Caldwell (2009) | Teiidae. | ICZN |
| Cnemidospora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cnemophilus | Passeriformes | Clements (2007) | . | ICZN |
| Cnemoscopus | Passeriformes | Clements (2007) | . | ICZN |
| Cnemotriccus | Passeriformes | Clements (2007) | . | ICZN |
| Cneoridium | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Cneorum | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Cnesmocarpon | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Cnesmone | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cnestidium | Oxalidales | Mabberley (2008) | Connaraceae. | ICBN |
| Cnestis | Oxalidales | Mabberley (2008) | Connaraceae. | ICBN |
| Cnestrum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cnicothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cnidanthea | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cnidanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cnidiocarpa | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cnidocodon | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cnidopus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cnidoscolus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cnipodectes | Passeriformes | Clements (2007) | . | ICZN |
| Coatesia | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Coaxana | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cobaea | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Cobana | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Cobananthus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Cobetia | Oceanospirillales | Garrity et al. (2005) | . | ICNB |
| Cobricosphaeridium | | Fensome et al. (1993) | Domain Eucarya - Phylum Dinozoa - Class Dinophyceae. Holocene. | ICBN |
| Coccidinium | Syndinida | Fensome et al. (1993) | . | ICZN |
| Coccinia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Coccochondra | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coccocypselum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coccolithus | Coccolithales | Edvardsen et al. (2000); Jordan et al. (2004) | Coccolithaceae. | ICBN |
| Coccoloba | Caryophyllales | Mabberley (2008) | Polygonaceae. | ICBN |
| Coccomyxa | | Letsch et al. (2009); Darienko et al. (2010) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. Elliptochloris-clade. | ICBN |
| Coccomyxa | Bivalvulida | Lom & Dyková (2006) | . | ICZN |
| Cocconerion | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Coccopedia | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Coccopygia | Passeriformes | Clements (2007) | . | ICZN |
| Coccospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Coccothraustes | Passeriformes | Clements (2007) | . | ICZN |
| Coccothrinax | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Coccotylus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Cocculus | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Coccycua | Cuculiformes | Clements (2007) | . | ICZN |
| Coccymys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Coccyzus | Cuculiformes | Clements (2007) | . | ICZN |
| Cochleanthes | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cochlearia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cochlearius | Ciconiiformes | Clements (2007) | . | ICZN |
| Cochleomeritus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cochlianthus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cochliatoxum | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Cochlidium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cochlioda | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cochliodomus | Philasterida | Lynn (2008) | . | ICZN |
| Cochliophilus | Philasterida | Lynn (2008) | . | ICZN |
| Cochliopodium | Himatismenida | Rogerson & Patterson (2000); Cavalier-Smith et al. (2004) | . | ICZN |
| Cochliostema | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Cochlodinium | Gymnodiniales | Fensome et al. (1993) | . | ICBN |
| Cochlosoma | Trichomonadida | Cepicka et al. (2010) | . | ICZN |
| Cochlospermum | Malvales | Mabberley (2008) | Bixaceae. | ICBN |
| Cochoa | Passeriformes | Clements (2007) | . | ICZN |
| Cochranella | Anura | Vitt & Caldwell (2009) | Centrolenidae. | ICZN |
| Cocleimonas | Thiotrichales | Tanaka et al. (2011) | . | ICNB |
| Cocleorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cocos | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Codariocalyx | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Coddia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Codia | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Codiaeum | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Codiocarpus | Icacinales | Mabberley (2008) | Icacinaceae. | ICBN |
| Codiophyllum | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Codon | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Codonacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Codonanthe | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Codonanthopsis | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Codonaria | Tintinnida | Lynn (2008) | . | ICZN |
| Codonella | Tintinnida | Lynn (2008) | . | ICZN |
| Codonellopsis | Tintinnida | Lynn (2008) | . | ICZN |
| Codonoblepharon | Orthotrichales | Goffinet et al. (2009) | . | ICBN |
| Codonobotrys | | Kristiansen & Preisig (2001) | Domain Eucarya - Kingdom Straminipila - Phylum Ochrophyta. | ICBN |
| Codonocarpus | Brassicales | Mabberley (2008) | Gyrostemonaceae. | ICBN |
| Codonocladium | Craspedida | Leadbeater & Thomsen (2000) | . | ICZN |
| Codonodendron | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (biflagellate). | ICBN |
| Codonopsis | Tintinnida | Lynn (2008) | . | ICZN |
| Codonopsis | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Codonorchis | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Codonorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Codonosiga | Craspedida | Leadbeater & Thomsen (2000) | Variant spelling. "Codosiga" is correct. | ICZN |
| Codonosigopsis | Craspedida | Nitsche et al. (2011) | . | ICZN |
| Codosiga | Craspedida | Leadbeater & Thomsen (2000) | Correct spelling against "Codonosiga". | ICZN |
| Codriophorus | Grimmiales | Goffinet et al. (2009) | . | ICBN |
| Coeia | Heteronemertea | Gibson (1995); Kajihara et al. (2008) | Junior synonym of Hubrechtella. | ICZN |
| Coelachne | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Coelachyrum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Coelanthum | Caryophyllales | Mabberley (2008) | Molluginaceae. | ICBN |
| Coelarthrum | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Coelia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Coeligena | Apodiformes | Clements (2007) | . | ICZN |
| Coeliopsis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Coella | Reptantia | Gibson (1995); Kajihara et al. (2008) | Junior synonym of Punnettia. | ICZN |
| Coelocantha | Phaeosphaerida | Takahashi & Anderson (2000) | . | ICZN |
| Coelocarpum | Lamiales | Mabberley (2008) | Verbenaceae. | ICBN |
| Coelocarteria | Poecilosclerida | Hajdu & Lôbo-Hajdu (2002) | . | ICZN |
| Coelocaryon | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Coeloclonium | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Coelocormus | Aplousobranchia | Monniot & Monniot (1972) | Didemnidae. | ICZN |
| Coelodendrum | Phaeodendrida | Takahashi & Anderson (2000) | . | ICZN |
| Coelodischela | Poecilosclerida | Hajdu & Lerner (2002) | . | ICZN |
| Coelogorgia | Alcyonacea | Bayer (1981) | Coelogorgiidae. | ICZN |
| Coelographis | Phaeodendrida | Takahashi & Anderson (2000) | . | ICZN |
| Coelogyne | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Coelomoron | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Coeloneurum | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Coeloperix | Chlamydodontida | Lynn (2008) | . | ICZN |
| Coelophragmus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Coelophrya | Astomatida | Lynn (2008) | . | ICZN |
| Coeloplana | Platyctenida | Harbison & Madin (1982) | . | ICZN |
| Coelops | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Coelopyrena | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coeloseris | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Coelosomides | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Coelosphaera | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Coelosphaeriopsis | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Coelosphaerium | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Coelostegia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Coelothigma | Thigmotrichida | Lynn (2008) | . | ICZN |
| Coelothrix | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Coelotropha | Protococcidiorida | Perkins et al. (2000) | . | ICZN |
| Coendou | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Coenemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Coenocorypha | Charadriiformes | Clements (2007) | . | ICZN |
| Coenocyathus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Coenocystis | | Darienko et al. (2010) | Domain Eucarya - Phylum Chlorophyta - Class Trebouxiophyceae. | ICBN |
| Coenonia | Dictyosteliales | Hagiwara (1989) | . | ICBN |
| Coenonia | Flavobacteriales | Garrity et al. (2005) | . | ICNB |
| Coenosmilia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Coeranoscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Coereba | Passeriformes | Clements (2007) | . | ICZN |
| Coffea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coggeria | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cognettiella | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cogniauxia | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cohaesibacter | Rhizobiales | Hwang & Cho (2008) | . | ICNB |
| Cohnella | Bacillales | Kämpfer et al. (2006) | . | ICNB |
| Cohnilembus | Philasterida | Lynn (2008) | . | ICZN |
| Coilochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Coincya | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Coix | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cojoba | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cola | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Colacium | Euglenales | Leedale (1967); Leedale (2000) | . | ICBN |
| Colacodasya | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Colacodictyon | Porphyridiales | Schneider & Wynne (2007) | . | ICBN |
| Colaconema | Colaconematales | Schneider & Wynne (2007) | . | ICBN |
| Colacopsis | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Colangia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Colanthelia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Colaptes | Piciformes | Clements (2007) | . | ICZN |
| Colchicum | Liliales | Mabberley (2008) | Colchicaceae. | ICBN |
| Coldenia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Colea | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Coleactina | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coleanthera | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Coleanthus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Coleaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Colebrookea | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Colemaniella | Heteronemertea | Gibson (1995) | . | ICZN |
| Coleocarya | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Coleocephalocereus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Coleochaete | Coleochaetales | Lewis & McCourt (2004) | . | ICBN |
| Coleochlamys | Microthamniales | Friedl & O'Kelly (2002); Lewis & McCourt (2004) | Earlier synonym of Fusochloris. | ICBN |
| Coleochloa | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Coleocoma | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Coleodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Coleodesmiopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Coleodesmium | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Coleofasciculus | Oscillatoriales | Hoffmann et al. (2005); Siegesmund et al. (2008) | . | ICBN |
| Coleogyne | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Coleonema | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Coleonyx | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Coleorhynchus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Coleostachys | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Coleostephus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Coleotrype | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Colepismatophila | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Coleps | Prorodontida | Lynn (2008) | . | ICZN |
| Coleura | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Colibri | Apodiformes | Clements (2007) | . | ICZN |
| Colignonia | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Colinus | Galliformes | Clements (2007) | . | ICZN |
| Colius | Coliiformes | Clements (2007) | . | ICZN |
| Collabium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Collaea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Collarenemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Collaria | Stemonitales | Yamamoto (1998); Poulain et al. (2011) | Later synonymous of Comatricha (Poulain et al., 2011). | ICBN |
| Collectella | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids). | ICZN |
| Colletia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Colletoecema | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Colletogyne | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Colligocineta | Rhynchodida | Lynn (2008) | . | ICZN |
| Colliguaja | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Collimonas | Burkholderiales | de Boer et al. (2004) | . | ICNB |
| Collinella | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids); Later homonym, but no replacement name was published; Probably a junior synonym of Discodermia, Theonella or Racodiscula. | ICZN |
| Collinia | Apostomatida | Lynn (2008) | . | ICZN |
| Collinina | Vestibuliferida | Lynn (2008) | . | ICZN |
| Collinsella | Coriobacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Collinsia | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Collinsonia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Collocalia | Apodiformes | Clements (2007) | . | ICZN |
| Colloderma | Stemonitales | Yamamoto (1998) | . | ICBN |
| Collodictyon | Diphylleida | Cavalier-Smith (2003) | . | ICZN |
| Collomia | Ericales | Mabberley (2008) | Polemoniaceae. | ICBN |
| Collorhabdium | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Collospermum | Asparagales | Mabberley (2008) | Asteliaceae. | ICBN |
| Collosphaera | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Collospongia | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Collotheca | Collothecaceae | Segers (2002); Segers (2007) | . | ICZN |
| Collozoum | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Colluricincla | Passeriformes | Clements (2007) | . | ICZN |
| Colobanthera | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Colobanthus | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Colobodactylus | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Colobodontium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Colobonema | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Colobosaura | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Colobosauroides | Squamata | Vitt & Caldwell (2009) | Gymnophthalmidae. | ICZN |
| Colobus | Primates | McKenna & Bell (1997) | . | ICZN |
| Colocasia | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Cologania | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cololejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Colomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Colona | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Colonia | Passeriformes | Clements (2007) | . | ICZN |
| Colonimilesia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Discorbinellidae. | ICZN |
| Colophospermum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Coloptychon | Squamata | Vitt & Caldwell (2009) | Anguidae. | ICZN |
| Colopus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Colorhamphus | Passeriformes | Clements (2007) | . | ICZN |
| Colospironympha | Trichonymphida | Cepicka et al. (2010) | . | ICZN |
| Colostethus | Anura | Vitt & Caldwell (2009) | Dendrobatidae. | ICZN |
| Colpias | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Colpidium | Tetrahymenida | Lynn (2008) | . | ICZN |
| Colpoda | Colpodida | Lynn (2008) | . | ICZN |
| Colpodella | Colpodellida | Cavalier-Smith & Chao (2004) | . | ICZN |
| Colpodidium | Nassulida | Lynn & Small (2000); Lynn (2008); Breiner et al. (2008) | . | ICZN |
| Colpodium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Colpogyne | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Colponema | Colponemida | Cavalier-Smith & Chao (2004) | . | ICZN |
| Colpophyllia | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Colpothrinax | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Colquhounia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Colteronema | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Coluber | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Colubrina | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Columba | Columbiformes | Clements (2007) | . | ICZN |
| Columbiadoria | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Columbina | Columbiformes | Clements (2007) | . | ICZN |
| Columellia | Bruniales | Mabberley (2008) | Columelliaceae. | ICBN |
| Columnea | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Columnitis | Hadromerida | Sarà (2002) | . | ICZN |
| Colura | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Colurella | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Coluria | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Colutea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Coluteocarpus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Colvillea | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Colwellia | Alteromonadales | Garrity et al. (2005) | . | ICNB |
| Comamonas | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Comandonia | Varipodida | Rogerson & Patterson (2000); Smirnov et al. (2005); Kudryavtsev et al. (2009) | Possibly, junior synonym of Flamella. | ICZN |
| Comandra | Santalales | Mabberley (2008) | Santalaceae. | ICBN |
| Comanthosphace | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Comarostaphylis | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Comatricha | Stemonitales | Yamamoto (1998) | . | ICBN |
| Combera | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Comborhiza | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Combretocarpus | Cucurbitales | Mabberley (2008) | Anisophylleaceae. | ICBN |
| Combretum | Myrtales | Mabberley (2008) | Combretaceae. | ICBN |
| Comesperma | Fabales | Mabberley (2008) | Polygalaceae. | ICBN |
| Cometes | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Cometodendron | Evaginogenida | Lynn (2008) | . | ICZN |
| Cometoides | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cominsia | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Comiphyton | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Commation | Commatiida | Cavalier-Smith (2003) | . | ICZN |
| Commelina | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Commersonia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Commidendrum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Commiphora | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Communoporus | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Comocladia | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Comolia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Comoliopsis | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Comoranthus | Lamiales | Mabberley (2008) | Oleaceae. | ICBN |
| Comospermum | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Compactochlorella | Chlorellales | Krienitz et al. (2012) | As Chlorellaceae. | ICBN |
| Comparettia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Comperia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Composocalyx | Amphidiscosida | Tabachnick & Menshenina (2002) | . | ICZN |
| Compostimonas | Micrococcales | Kim et al. (2012) | . | ICNB |
| Compressigerina | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Reussellidae. | ICZN |
| Compsoneura | Magnoliales | Mabberley (2008) | Myristicaceae. | ICBN |
| Compsophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Compsopogon | Compsopogonales | Schneider & Wynne (2007) | . | ICBN |
| Compsopogonopsis | Compsopogonales | Schneider & Wynne (2007) | . | ICBN |
| Compsosomella | Pleuronematida | Lynn (2008) | . | ICZN |
| Compsothamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Compsothamnionella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Compsothraupis | Passeriformes | Clements (2007) | . | ICZN |
| Comptonella | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Comptonia | Fagales | Mabberley (2008) | Myricaceae. | ICBN |
| Conacon | Chaunacanthida | Febvre et al. (2000) | . | ICZN |
| Conandrium | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Conandron | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Conanthera | Asparagales | Mabberley (2008) | Tecophilaeaceae. | ICBN |
| Conaperta | Acoela | Faubel & Noreña (2001); Hooge & Tyler (2005) | . | ICZN |
| Conardia | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Concentrotheca | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Conceveiba | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Conchidium | Phaeoconchida | Takahashi & Anderson (2000) | . | ICZN |
| Conchiformibium | Neisseriales | Xie & Yokota (2005) | Incorrect spelling of Conchiformibius. | ICNB |
| Conchiformibius | Neisseriales | Xie & Yokota (2005) | . | ICNB |
| Conchocarpus | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Conchopetalum | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Conchophrys | Microthoracida | Lynn (2008) | . | ICZN |
| Conchophthirus | Pleuronematida | Lynn (2008) | . | ICZN |
| Conchophyllum | Philasterida | Lynn (2008) | . | ICZN |
| Conchoscutum | Pleuronematida | Lynn (2008) | . | ICZN |
| Conchostoma | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Condalia | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Condaminea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Condominium | Aplousobranchia | Kott (1998) | Protopolyclinidae. | ICZN |
| Condylactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Condylago | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Condylanthus | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Condylidium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Condylocarpon | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Condyloderes | Cyclorhagida | Higgins (1990) | . | ICZN |
| Condylopodium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Condylostentor | Heterotrichida | Miao et al. (2009) | . | ICZN |
| Condylostoma | Heterotrichida | Lynn (2008) | . | ICZN |
| Condylostomides | Heterotrichida | Lynn (2008) | . | ICZN |
| Condylura | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Conepatus | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Conexibacter | Solirubrobacterales | Garrity et al. (2005); Reddy & Garcia-Pichel (2009); Ludwig et al. (2012) | . | ICNB |
| Confluphyllia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Congea | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Conglophragmium | Lituolida | Kaminski (2008) | Reinstated from Thalmannammina and Trochamminoides. | ICZN |
| Congolanthus | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Congosorex | Soricomorpha | Hutterer (2005) | . | ICZN |
| Congracilaria | Gracilariales | Schneider & Wynne (2007) | . | ICBN |
| Congregatocarpus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Congregibacter | | Spring et al. (2009) | Domain Bacteria - Phylum Proteobacteria - Class Gammaproteobacteria. | ICNB |
| Congregopora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Congruentidium | Peridiniales | Fensome et al. (1993) | . | ICBN |
| Conicosia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Conicospirillinoides | Involutinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992); Sen Gupta (1999) | Planispirillinidae. | ICZN |
| Coniculostomum | Sporadotrichida | Lynn (2008) | . | ICZN |
| Conidophrys | Pilisuctorida | Lynn (2008) | . | ICZN |
| Conilurus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Coniogramme | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Conion | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Coniophanes | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Conioptilon | Passeriformes | Clements (2007) | . | ICZN |
| Conioselinum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Conirostrum | Passeriformes | Clements (2007) | . | ICZN |
| Conium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Connarus | Oxalidales | Mabberley (2008) | Connaraceae. | ICBN |
| Connellia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Connemarella | Textulariida | Kaminski (2000) | Pseudogaudryininae, Textulariacea. | ICZN |
| Connochaetes | Cetartiodactyla | McKenna & Bell (1997); Murphy et al. (2001) | Artiodactyla. | ICZN |
| Conobea | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Conocalyx | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Conocarpus | Myrtales | Mabberley (2008) | Combretaceae. | ICBN |
| Conocephalum | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Conochilopsis | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Conochilus | Flosculariaceae | Segers (2002); Segers (2007) | . | ICZN |
| Conocladium | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora. | ICZN |
| Conocliniopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Conoclinium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Conocyathus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Conocyema | Heterocyemida | Stunkard (1982); Furuya et al. (2007) | . | ICZN |
| Conolophus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Conomitra | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Conophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Conopholis | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Conophytum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Conopias | Passeriformes | Clements (2007) | . | ICZN |
| Conopodium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Conopophaga | Passeriformes | Clements (2007) | . | ICZN |
| Conopophila | Passeriformes | Clements (2007) | . | ICZN |
| Conopora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Conopsis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Conorbella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glabratellidae. | ICZN |
| Conorete | Hexactinosida | Reiswig & Wheeler (2002) | . | ICZN |
| Conosapium | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Conoscyphus | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Conospermum | Proteales | Mabberley (2008) | Proteaceae. | ICBN |
| Conostegia | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Conostephium | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Conostoma | Passeriformes | Clements (2007) | . | ICZN |
| Conostomium | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Conostomum | Bartramiales | Goffinet et al. (2009) | . | ICBN |
| Conostylis | Commelinales | Mabberley (2008) | Haemodoraceae. | ICBN |
| Conothamnus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Conothraupis | Passeriformes | Clements (2007) | . | ICZN |
| Conotrochamminoides | Lituolida | Kaminski (2008) | Conotrochamminidae. | ICZN |
| Conotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Conradiella | Synurales | Kristiansen & Preisig (2001) | Mallomonadaceae. | ICBN |
| Conradina | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Conradocystis | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Dinobryaceae (uniflagellate). | ICBN |
| Conraua | Anura | Vitt & Caldwell (2009) | Petropedetidae. | ICZN |
| Conringia | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Consolea | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Consolida | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Constancea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Constantia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Constantinea | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Constrictibacter | Rhodospirillales | Yamada et al. (2011) | . | ICNB |
| Contarinia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Contia | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Contophrya | Astomatida | Lynn (2008) | "Contophyra" in Lynn (2008). | ICZN |
| Contopus | Passeriformes | Clements (2007) | . | ICZN |
| Contoriocorpa | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Contospora | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Convallaria | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Convoluella | Acoela | Faubel & Noreña (2001) | . | ICZN |
| Convoluta | Acoela | Dörjes (1968); Faubel & Noreña (2001); Hooge & Tyler (2005) | . | ICZN |
| Convolutriloba | Acoela | Hooge (2003) | Under confirmation. | ICZN |
| Convolvulus | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Conyza | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Conzattia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cooktownia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Coolia | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Coopernookia | Asterales | Mabberley (2008) | Goodeniaceae. | ICBN |
| Copaifera | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Copemetopus | Heterotrichida | Lynn (2008) | . | ICZN |
| Copernicia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cophixalus | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Cophosaurus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Cophoscincopus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cophotis | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Cophyla | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Copiapoa | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Copiula | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Coprobacillus | Erysipelotrichales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Coprococcus | Clostridiales | Garrity et al. (2005) | . | ICNB |
| Copromyxa | Euamoebida | Patterson et al. (2000); Cavalier-Smith et al. (2004); Smirnov et al. (2011) | . | ICZN |
| Copromyxella | Euamoebida | Patterson et al. (2000); Cavalier-Smith et al. (2004); Smirnov et al. (2011) | . | ICZN |
| Coprosma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coprothermobacter | Thermoanaerobacterales | Garrity et al. (2005); Ludwig et al. (2009) | . | ICNB |
| Copsychus | Passeriformes | Clements (2007) | . | ICZN |
| Coptidium | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Coptis | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Coptophyllum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coptosapelta | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coptosperma | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coracias | Coraciiformes | Clements (2007) | . | ICZN |
| Coracina | Passeriformes | Clements (2007) | . | ICZN |
| Coracopsis | Psittaciformes | Clements (2007) | . | ICZN |
| Coracornis | Passeriformes | Clements (2007) | . | ICZN |
| Coragyps | Falconiformes | Clements (2007) | . | ICZN |
| Coraliomargarita | Puniceicoccales | Yoon et al. (2007); Yoon et al. (2007) | . | ICNB |
| Corallibacter | Flavobacteriales | Kim et al. (2012) | . | ICNB |
| Coralliium | Alcyonacea | Bayer (1981) | Coralliidae. | ICZN |
| Corallimorphus | Corallimorpharia | Fautin et al. (2007) | . | ICZN |
| Corallina | Corallinales | Schneider & Wynne (2007) | . | ICBN |
| Corallistes | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Corallistidae. | ICZN |
| Corallocarpus | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Corallochytrium | Corallochytrida | Cavalier-Smith (1998) | . | ICZN |
| Corallococcus | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Corallocolpoda | Colpodida | Lynn (2008) | . | ICZN |
| Corallodiscus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Corallomyxa | | Smirnov et al. (2011) | Domain Eucarya - Phylum Amoebozoa - Subphylum Lobosa; Stereomyxidae. | ICZN |
| Corallophila | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Corallorhiza | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Corallus | Squamata | Vitt & Caldwell (2009) | Serpentes. Boidae. | ICZN |
| Corapipo | Passeriformes | Clements (2007) | . | ICZN |
| Corbichonia | Caryophyllales | Thorne & Reveal (2007); Mabberley (2008); Doweld & Reveal (2008) | Lophiocarpaceae. | ICBN |
| Corbitella | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Corchoropsis | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Corchorus | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Corcontochrysis | Pavlovales | van der Veer & Leewis (1977); Jordan et al. (2004) | Later synonym of Pavlova, but the recombination of the type species of Corcontochrysis was not validly published in van der Veer & Leewis (1977) under ICBN, because the page(s) of the original description was not cited.. | ICBN |
| Corcorax | Passeriformes | Clements (2007) | . | ICZN |
| Corculognathia | Bursovaginoidea | Sørensen (2002) | . | ICZN |
| Cordagalma | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Cordeauxia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cordia | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cordiglottis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cordisepalum | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Cordobia | Malpighiales | Mabberley (2008) | Malpighiaceae. | ICBN |
| Cordyla | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cordylanthus | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Cordylecladia | Rhodymeniales | Schneider & Wynne (2007) | . | ICBN |
| Cordyline | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Cordylocarpus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cordylogyne | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cordylophora | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cordylosaurus | Squamata | Vitt & Caldwell (2009) | Cordylidae. | ICZN |
| Cordylus | Squamata | Vitt & Caldwell (2009) | Cordylidae. | ICZN |
| Corella | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Corellidae. | ICZN |
| Corelloides | Phlebobranchia | Monniot & Monniot (1972) | Corellidae. | ICZN |
| Corellopsis | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Corellidae. | ICZN |
| Corema | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Coreocarpus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Coreopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Corethamnium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Corethria | Exogenida | Lynn (2008) | . | ICZN |
| Corethrodendron | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Corethrogyne | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Corhiza | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Coriandrum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Coriaria | Cucurbitales | Mabberley (2008) | Coriariaceae. | ICBN |
| Coriella | Coloniales | Emschermann (1972) | Barentsiidae. | ICZN |
| Coriobacterium | Coriobacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Coriophyllum | Palmariales | Schneider & Wynne (2007) | . | ICBN |
| Coriplites | Haptorida | Lynn (2008) | . | ICZN |
| Coris | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Corispermum | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Corisphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | former Calyptrosphaeraceae. | ICBN |
| Coristospermum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Corlissetta | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Corlissia | | Lynn (2008) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Ciliophora - Class Karyorelictea. | ICZN |
| Corlissiella | Astomatida | Lynn (2008) | . | ICZN |
| Cormobates | Passeriformes | Clements (2007) | . | ICZN |
| Cormura | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Cornechiniscus | Echiniscoidea | Kinchin (1994) | . | ICZN |
| Cornimeritus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cornopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cornuapyxis | Arcellinida | Meisterfeld (2000) | Difflugina -- Trigonopyxidae. | ICZN |
| Cornucopiae | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cornukaempferia | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Cornulaca | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Cornularia | Alcyonacea | Bayer (1981) | Cornulariidae. | ICZN |
| Cornulella | Poecilosclerida | Hooper (2002) | . | ICZN |
| Cornuloculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ophthalmidiidae. | ICZN |
| Cornulum | Poecilosclerida | Hooper (2002) | . | ICZN |
| Cornumyces | Leptomitales | Dick (2001); Kirk et al. (2008) | Leptomitales. | ICBN |
| Cornus | Cornales | Mabberley (2008) | Cornaceae. | ICBN |
| Cornuspira | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cornuspiridae. | ICZN |
| Cornuspiramia | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nubeculariidae. | ICZN |
| Cornuspirella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cornuspiridae. | ICZN |
| Cornuspiroides | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cornuspiridae. | ICZN |
| Cornutella | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Cornutia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cornuvia | Trichiales | Yamamoto (1998) | . | ICBN |
| Corokia | Asterales | Mabberley (2008) | Argophyllaceae. | ICBN |
| Corollonema | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Coronanthera | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Coronarctus | Arthrotardigrada | Kinchin (1994) | . | ICZN |
| Coronastrum | Chlorellales | Bock et al. (2011) | As Chlorellaceae. | ICBN |
| Coronella | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Coronephthya | Alcyonacea | Bayer (1981) | Nephtheidae. | ICZN |
| Coronilla | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Coronochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Coronoepimeritus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Coronosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Syracosphaerales ?. | ICBN |
| Coronthigma | Thigmotrichida | Lynn (2008) | . | ICZN |
| Coronympha | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Corpuscularia | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Correa | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Correanemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Corrigiola | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Corryocactus | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Corsia | Liliales | Mabberley (2008) | Corsiaceae. | ICBN |
| Corsinia | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Corsiopsis | Liliales | Mabberley (2008) | Corsiaceae. | ICBN |
| Corsoua | Heteronemertea | Gibson (1995) | . | ICZN |
| Cortaderia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cortia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Corticium | Homosclerophorida | Muricy & Díaz (2002) | . | ICZN |
| Corticocolpoda | Colpodida | Lynn (2008) | . | ICZN |
| Cortiella | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cortispongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Cortusa | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Corucia | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Corvinella | Passeriformes | Clements (2007) | . | ICZN |
| Corvoheteromeyenia | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Corvomeyenia | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Corvospongilla | Haplosclerida | Manconi & Pronzato (2002) | . | ICZN |
| Corvus | Passeriformes | Clements (2007) | . | ICZN |
| Coryanthes | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Corybas | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Corycella | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Corycium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Corydalis | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Corydendrium | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Corydon | Passeriformes | Clements (2007) | . | ICZN |
| Corylopsis | Saxifragales | Mabberley (2008) | Hamamelidaceae. | ICBN |
| Corylus | Fagales | Mabberley (2008) | Betulaceae. | ICBN |
| Corymbellus | Prymnesiales | Jordan et al. (2004) | Prymnesiaceae. | ICBN |
| Corymbia | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Corymbium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Corymborkis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Corymorpha | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Corynabutilon | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Corynactis | Corallimorpharia | Fautin et al. (2007) | . | ICZN |
| Corynaea | Santalales | Mabberley (2008) | Balanophoraceae. | ICBN |
| Corynanthe | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Corynanthera | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Corynascidia | Phlebobranchia | Monniot & Monniot (1972); Monniot (2001) | Corellidae. | ICZN |
| Coryne | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Corynebacterium | Corynebacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Corynecladia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Corynephorus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Corynocarpus | Cucurbitales | Mabberley (2008) | Corynocarpaceae. | ICBN |
| Corynocystis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Corynomorpha | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Corynophrya | Endogenida | Lynn (2008) | . | ICZN |
| Corynoplastis | Rhodellales | Yokoyama et al. (2009) | . | ICBN |
| Corynopuntia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Corynorhinus | Chiroptera | Simmons (2005) | . | ICZN |
| Corynosoma | Polymorphida | Amin (1985) | . | ICZN |
| Corynosomoides | Echinorhynchida | Wang & Zhang (1987) | Rhadinorhynchidae. Now checking. | ICZN |
| Corynostylis | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Corynotheca | Asparagales | Mabberley (2008) | Asparagaceae. | ICBN |
| Corypha | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Coryphantha | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Coryphaspiza | Passeriformes | Clements (2007) | . | ICZN |
| Coryphistera | Passeriformes | Clements (2007) | . | ICZN |
| Coryphomys | Rodentia | Musser & Carleton (2005) | Recently extinct. | ICZN |
| Coryphophylax | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Coryphospingus | Passeriformes | Clements (2007) | . | ICZN |
| Coryphostoma | Buliminida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Fursenkoinidae. | ICZN |
| Coryphothamnus | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Corystolona | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Corythaeola | Cuculiformes | Clements (2007) | . | ICZN |
| Corythaixoides | Cuculiformes | Clements (2007) | . | ICZN |
| Corythion | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Corythionella | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Corythomantis | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Corythophora | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Corythopis | Passeriformes | Clements (2007) | . | ICZN |
| Corytophanes | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Corytoplectus | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Coscinaraea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Coscinaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Coscinium | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Coscinoderma | Dictyoceratida | Cook & Bergquist (2002) | . | ICZN |
| Coscinospira | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Peneroplidae. | ICZN |
| Coscoroba | Anseriformes | Clements (2007) | . | ICZN |
| Cosentinia | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cosenzaea | Enterobacteriales | Giammanco et al. (2011) | . | ICNB |
| Cosmarium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Cosmelia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cosmetira | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cosmetirella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cosmetophilus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cosmianthemum | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Cosmibuena | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cosmocalyx | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cosmocladium | Desmidiales | Gontcharov (2008) | . | ICBN |
| Cosmocolpoda | Colpodida | Lynn (2008) | . | ICZN |
| Cosmoeca | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Cosmognathia | Filospermoidea | Sørensen (2002) | . | ICZN |
| Cosmos | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cosmostigma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cossinia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Cossothigma | Sporadotrichida | Lynn (2008) | . | ICZN |
| Cossypha | Passeriformes | Clements (2007) | . | ICZN |
| Cossyphicula | Passeriformes | Clements (2007) | . | ICZN |
| Costera | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Costertonia | Flavobacteriales | Kwon et al. (2006) | . | ICNB |
| Costesia | Gigaspermales | Goffinet et al. (2009) | . | ICBN |
| Costifer | | Pisera & Lévi (2002) | Domain Eucarya - Kingdom Animalia - Phylum Porifera - Class Demospongiae (lithistids) Isoraphiniidae. | ICZN |
| Costularia | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Costus | Zingiberales | Mabberley (2008) | Costaceae. | ICBN |
| Cosymbotus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Cota | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cotensicoma | Pleuronematida | Lynn (2008) | . | ICZN |
| Cotensita | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Cothurnia | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Cothurniopsis | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Cothurnopsis | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Cotinga | Passeriformes | Clements (2007) | . | ICZN |
| Cotinus | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Cotoneaster | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Cotopaxia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cottea | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cottendorfia | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Cotterillia | Sporadotrichida | Foissner & Stoeck (2011) | . | ICZN |
| Cottonia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cottoniella | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cotula | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Coturnicops | Gruiformes | Clements (2007) | . | ICZN |
| Coturnix | Galliformes | Clements (2007) | . | ICZN |
| Cotyledon | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Cotylelobium | Malvales | Mabberley (2008) | Dipterocarpaceae. | ICBN |
| Cotylolabium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cotylorhiza | Rhizostomeae | Kramp (1961) | . | ICZN |
| Cotylothigma | Thigmotrichida | Lynn (2008) | . | ICZN |
| Coua | Cuculiformes | Clements (2007) | . | ICZN |
| Couchia | Saprolegniales | Dick (2001); Kirk et al. (2008) | Saprolegniaceae. | ICBN |
| Couchioplanes | Micromonosporales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Couepia | Malpighiales | Mabberley (2008) | Chrysobalanaceae. | ICBN |
| Cougourdella | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Coula | Santalales | Mabberley (2008) | Erythropalaceae. | ICBN |
| Coulterella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Coulteria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Coulterophytum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Couma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Couratari | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Couroupita | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Coursetia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Courtoisina | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cousinia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cousiniopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Coussapoa | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Coussarea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coutaportla | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coutarea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coutoubea | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Coveniella | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cowdria | Rickettsiales | Garrity et al. (2005) | . | ICNB |
| Cowiea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Coxiella | Legionellales | Garrity et al. (2005) | . | ICNB |
| Crabbea | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Crabtreella | Rhizobiales | Xie & Yokota (2006) | . | ICNB |
| Cracosna | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Cracticus | Passeriformes | Clements (2007) | . | ICZN |
| Craibella | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Craibia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Craibiodendron | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Craigia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Crambe | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Crambe | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Crambella | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Crambione | Rhizostomeae | Kramp (1961) | . | ICZN |
| Crambionella | Rhizostomeae | Kramp (1961) | . | ICZN |
| Craniaspis | Arthracanthida | Febvre et al. (2000) | . | ICZN |
| Cranichis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Craniella | Spirophorida | Van Soest & Rützler (2002) | . | ICZN |
| Craniolaria | Lamiales | Mabberley (2008) | Martyniaceae. | ICBN |
| Cranioleuca | Passeriformes | Clements (2007) | . | ICZN |
| Craniospermum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Craniotome | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cranocarpus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cranotheridium | Haptorida | Lynn (2008) | . | ICZN |
| Craseoa | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Craseonycteris | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Crasiella | Macrodasyida | Hummon & Todaro (2010) | . | ICZN |
| Craspedacusta | Limnomedusae | Bouillon et al. (2006) | . | ICZN |
| Craspedia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Craspedocarpus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Craspedolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Craspedomyoschiston | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Craspedorhachis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Craspedotella | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Craspidospermum | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Crassichona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Crassilingua | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Crassinarke | Torpediniformes | Nelson (2006) | . | ICZN |
| Crassiphyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Crassitegula | Sebdeniales | Schneider & Wynne (2007) | . | ICBN |
| Crassocephalum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crassonemertes | Pelagica | Gibson (1995) | . | ICZN |
| Crassophyllum | Pennatulacea | Williams (1995) | . | ICZN |
| Crassula | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Crataegus | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Crataemespilus | Rosales | Mabberley (2008) | xCrataemespilus. Crataegus x Mespilus hybrids. Rosaceae. | ICBN |
| Cratenemertes | Cratenemertea | Gibson (1995); Crandall & Gibson (1998) | . | ICZN |
| Crateranthus | Ericales | Mabberley (2008) | Lecythidaceae. | ICBN |
| Craterispermum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Crateristoma | Hypocomatida | Lynn (2008) | . | ICZN |
| Craterites | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Rhapydioninidae. | ICZN |
| Crateritheca | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Craterium | Physarales | Yamamoto (1998) | . | ICBN |
| Craterocapsa | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Craterocystis | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Craterolophus | Stauromedusae | Kramp (1961) | . | ICZN |
| Crateromorpha | Lyssacinosida | Tabachnick (2002) | . | ICZN |
| Crateromys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Crateroscelis | Passeriformes | Clements (2007) | . | ICZN |
| Craterosiphon | Malvales | Mabberley (2008) | Thymelaeaceae. | ICBN |
| Craterostigma | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Crateva | Brassicales | Mabberley (2008) | Capparaceae. | ICBN |
| Craticulineus | Heteronemertea | Gibson (1995) | . | ICZN |
| Craticuloscuta | Thigmotrichida | Lynn (2008) | . | ICZN |
| Cratogeomys | Rodentia | Patton (2005) | . | ICZN |
| Cratoneuron | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cratoneuropsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cratostigma | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Pyuridae. | ICZN |
| Cratoxylum | Malpighiales | Mabberley (2008) | Hypericaceae. | ICBN |
| Cratylia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cratystylis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Craugastor | Anura | Vitt & Caldwell (2009) | Brachycephalidae. | ICZN |
| Craurococcus | Rhodospirillales | Garrity et al. (2005) | . | ICNB |
| Crax | Galliformes | Clements (2007) | . | ICZN |
| Creagrus | Charadriiformes | Clements (2007) | . | ICZN |
| Creatophora | Passeriformes | Clements (2007) | . | ICZN |
| Crebricoma | Rhynchodida | Lynn (2008) | . | ICZN |
| Crecopsis | Gruiformes | Clements (2007) | . | ICZN |
| Crella | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Crellastrina | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Crellomima | Poecilosclerida | Van Soest (2002) | . | ICZN |
| Cremanthodium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cremaspora | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cremastosperma | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cremastra | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cremersia | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Cremnomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cremnophila | Saxifragales | Mabberley (2008) | Crassulaceae. | ICBN |
| Cremnophyton | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Cremnothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cremocarpon | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cremolobus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cremosperma | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Cremospermopsis | Lamiales | Skog & Kvist (2002); Mabberley (2008) | Not "Cremnospermopsis." Gesneriaceae. | ICBN |
| Crenadactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Crenea | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Crenidium | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Crenosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Crenothrix | Methylococcales | Garrity et al. (2005); Stoecker et al. (2006) | . | ICNB |
| Creochiton | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Creolimax | Ichthyophonida | Marshall et al. (2008) | . | ICZN |
| Crepidiastrum | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crepidomanes | Hymenophyllales | Christenhusz et al. (2011) | . | ICBN |
| Crepidoodinium | | Fensome et al. (1993); Skovgaard et al. (2007) | Domain Eucarya - Kingdom Alveolatobiontes - Phylum Dinozoa - Class Dinophyceae. Former Blastodiniales. | ICBN |
| Crepidophryne | Anura | Vitt & Caldwell (2009) | Bufonidae. | ICZN |
| Crepidophyllum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Crepidorhopalon | Lamiales | Mabberley (2008) | Linderniaceae. | ICBN |
| Crepidospermum | Sapindales | Mabberley (2008) | Burseraceae. | ICBN |
| Crepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crescentia | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Cresia | Rhodymeniales | Lozada-Troche et al. (2010) | . | ICBN |
| Cressa | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Creurgops | Passeriformes | Clements (2007) | . | ICZN |
| Crevicometes | Exogenida | Lynn (2008) | . | ICZN |
| Crex | Gruiformes | Clements (2007) | . | ICZN |
| Cribbia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cribraria | Liceales | Yamamoto (1998) | . | ICBN |
| Cribratinoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Cribrina | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cribrinopsis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cribrobaggina | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Bagginidae. | ICZN |
| Cribrobigenerina | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Textulariidae. | ICZN |
| Cribrobulimina | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Valvulinidae. | ICZN |
| Cribrochalina | Haplosclerida | Desqueyroux-Faúndez & Valentine (2002) | . | ICZN |
| Cribroelphidium | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Elphidiidae. | ICZN |
| Cribrogoesella | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Valvulinidae. | ICZN |
| Cribrolagena | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagenidae. | ICZN |
| Cribrolinoides | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroloculinidae. | ICZN |
| Cribromiliolinella | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Cribropyrgo | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Cribrorobulina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Vaginulinidae. | ICZN |
| Cribrospiroloculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Spiroloculinidae. | ICZN |
| Cribrostomellus | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Haplophragmoididae. | ICZN |
| Cribrostomoides | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Haplophragmoididae. | ICZN |
| Cribrothalammina | Astrorhizida | Kaminski (2000) | Saccammininae. | ICZN |
| Cricetomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cricetulus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cricetus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Criconympha | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Cricophorus | Actiniaria | Fautin et al. (2007) | Junior homonym, but no replacement name was published. | ICZN |
| Cricosaura | Squamata | Vitt & Caldwell (2009) | Xantusiidae. | ICZN |
| Cricosphaera | Coccolithales | Christensen (1978); Jordan et al. (2004) | Later synonym of Pleurochrysis. | ICBN |
| Cricundella | Tintinnida | Lynn (2008) | . | ICZN |
| Crimmia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Crinalium | Oscillatoriales | Hoffmann et al. (2005) | . | ICBN |
| Crinia | Anura | Vitt & Caldwell (2009) | Myobatrachidae. | ICZN |
| Crinifer | Cuculiformes | Clements (2007) | . | ICZN |
| Criniger | Passeriformes | Clements (2007) | . | ICZN |
| Crinipes | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Crinodendron | Oxalidales | Mabberley (2008) | Elaeocarpaceae. | ICBN |
| Crinolina | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Crinum | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Crioceras | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Crisantophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Criscia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crispatotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Crispiloba | Asterales | Mabberley (2008) | Alseuosmiaceae. | ICBN |
| Cristalloidophora | Piroplasmorida | Perkins et al. (2000) | . | ICZN |
| Cristaria | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cristatella | Brassicales | Mabberley (2008) | Cleomaceae. | ICBN |
| Cristichona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Cristigera | Pleuronematida | Lynn (2008) | . | ICZN |
| Cristispira | Spirochaetales | Garrity et al. (2005) | . | ICNB |
| Cristonia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cristulospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Crithidia | Trypanosomatida | Moreira et al. (2004) | . | ICZN |
| Crithionina | Astrorhizida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hemisphaeramminidae. | ICZN |
| Crithmum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Crithopsis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Critolaus | Euonychophora | Reid (1996) | Peripatopsidae. | ICZN |
| Critonia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Critoniadelphus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Critoniella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Critoniopsis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Croasdalea | Desmidiales | Bicudo & Mercante (1993) | . | ICBN |
| Crobylanthe | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Crobylura | Haptorida | Lynn (2008) | . | ICZN |
| Crocanthemum | Malvales | Mabberley (2008) | Cistaceae. | ICBN |
| Croceibacter | Flavobacteriales | Garrity et al. (2005) | . | ICNB |
| Croceicoccus | Sphingomonadales | Xu et al. (2009) | . | ICNB |
| Croceitalea | Flavobacteriales | Lee et al. (2008) | . | ICNB |
| Crocias | Passeriformes | Clements (2007) | . | ICZN |
| Crocidium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crocidura | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Crocinitomix | Flavobacteriales | Bowman et al. (2003) | . | ICNB |
| Crocodilurus | Squamata | Vitt & Caldwell (2009) | Teiidae. | ICZN |
| Crocodylus | Crocodylia | Vitt & Caldwell (2009) | Crocodylidae. | ICZN |
| Crocosmia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Crocus | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Crocuta | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Croizatia | Malpighiales | Mabberley (2008) | Phyllanthaceae. | ICBN |
| Cromapanax | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Cromidon | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Cromyechinus | Spumellaria | Anderson et al. (2000) | . | ICZN |
| Cronbergia | Nostocales | Komárek et al. (2010) | . | ICBN |
| Croninia | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cronisia | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cronobacter | Enterobacteriales | Iversen et al. (2008) | . | ICNB |
| Cronquistianthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Croomia | Pandanales | Mabberley (2008) | Stemonaceae. | ICBN |
| Croptilon | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crosbya | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Crosbyia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glabratellidae. | ICZN |
| Crossandra | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Crossandrella | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Crossarchus | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Crossidium | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Crossiella | Pseudonocardiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Crosslandia | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Crossleyia | Passeriformes | Clements (2007) | . | ICZN |
| Crossobamon | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Crossocalyx | Jungermanniales | Söderström et al. (2010) | . | ICBN |
| Crossocarpus | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Crossodactylodes | Anura | Vitt & Caldwell (2009) | Cycloramphidae. | ICZN |
| Crossodactylus | Anura | Vitt & Caldwell (2009) | Hylodidae. | ICZN |
| Crossomitrium | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Crossomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Crossopetalum | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Crossopteryx | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Crossoptilon | Galliformes | Clements (2007) | . | ICZN |
| Crossosoma | Crossosomatales | Mabberley (2008) | Crossosomataceae. | ICBN |
| Crossosperma | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Crossostemma | Malpighiales | Mabberley (2008) | Passifloraceae. | ICBN |
| Crossostephium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crossostylis | Malpighiales | Mabberley (2008) | Rhizophoraceae. | ICBN |
| Crossota | Trachymedusae | Bouillon et al. (2006) | . | ICZN |
| Crossothamnus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Crossyne | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Crotalaria | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Crotalus | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Crotaphatrema | Gymnophiona | Vitt & Caldwell (2009) | Scolecomorphidae. | ICZN |
| Crotaphopeltis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Crotaphytus | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Croton | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Crotonogyne | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Crotonogynopsis | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Crotophaga | Cuculiformes | Clements (2007) | . | ICZN |
| Crouania | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Crouanophycus | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Crowea | Sapindales | Mabberley (2008) | Rutaceae. | ICBN |
| Crucianella | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cruciangulum | Desmidiales | Williamson (1999) | . | ICBN |
| Cruciata | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Crucigeniella | Chlorellales | Pažoutová et al. (2010) | As Oocystis-clade or Oocystaceae. | ICBN |
| Crucihimalaya | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cruciloculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Cruciplacolithus | Coccolithales | Edvardsen et al. (2000); Jordan et al. (2004) | Coccolithaceae. | ICBN |
| Crucispina | Acanthoecida | Leadbeater & Thomsen (2000) | . | ICZN |
| Cruckshanksia | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Crucocephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cruddasia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Crudia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Crumenaria | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Crumia | Pottiales | Goffinet et al. (2009) | . | ICBN |
| Crumuscus | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Crunomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cruoria | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Cruoriopsis | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Crupina | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cruriraja | Rajiformes | Nelson (2006) | . | ICZN |
| Crusea | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Crustomastix | Dolichomastigales | Marin & Melkonian (2010) | . | ICBN |
| Cruzella | Neobodonida | Moreira et al. (2004) | . | ICZN |
| Cruziohyla | Anura | Vitt & Caldwell (2009) | Hylidae. | ICZN |
| Crybelonemertes | Eumonostilifera | Chernyshev (2005); Kajihara et al. (2008) | Emplectonematidae. | ICZN |
| Cryobacterium | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Cryomorpha | Flavobacteriales | Bowman et al. (2003) | . | ICNB |
| Cryophis | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cryosophila | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cryothecomonas | Cryomonadida | Cavalier-Smith (1993); Howe et al. (2011) | . | ICZN |
| Cryphaea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cryphaeophilum | Hypnales | Greuter et al. (1993); Goffinet et al. (2009) | Not "Cryphaeophilium" (Greuter et al., 1993). | ICBN |
| Cryphidium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Crypsirina | Passeriformes | Clements (2007) | . | ICZN |
| Crypsis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cryptacineta | Endogenida | Lynn (2008) | . | ICZN |
| Cryptactites | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Cryptagama | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Cryptanaerobacter | Clostridiales | Juteau et al. (2005) | . | ICNB |
| Cryptandra | Rosales | Mabberley (2008) | Rhamnaceae. | ICBN |
| Cryptantha | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cryptanthus | Poales | Mabberley (2008) | Bromeliaceae. | ICBN |
| Cryptarrhena | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cryptaulax | Neobodonida | Novarino (1996); von der Heyden et al. (2004) | Later homonym. Replaced by Cryptaulaxoides. | ICZN |
| Cryptaulaxoides | Neobodonida | Novarino (1996); von der Heyden et al. (2004) | . | ICZN |
| Cryptella | | Novarino (2003) | Domain Eucarya - Kingdom Cryptobiontes ? - Phylum Cryptophyta ?. | ICBN |
| Cryptelytrops | Squamata | Vitt & Caldwell (2009) | Serpentes. Viperidae. | ICZN |
| Crypteronia | Myrtales | Mabberley (2008) | Crypteroniaceae. | ICBN |
| Crypthecodinium | Gonyaulacales | Fensome et al. (1993) | . | ICBN |
| Crypthelia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Crypticola | Myzocytiopsidales | Dick (2001); Kirk et al. (2008) | Crypticolaceae. | ICBN |
| Cryptobacterium | Coriobacteriales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Cryptobatrachus | Anura | Vitt & Caldwell (2009) | Cryptobatrachidae. | ICZN |
| Cryptobia | Parabodonida | Moreira et al. (2004) | . | ICZN |
| Cryptoblepharus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cryptobranchus | Caudata | Vitt & Caldwell (2009) | Cryptobranchidae. | ICZN |
| Cryptocapnos | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Cryptocarpus | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Cryptocarya | Laurales | Mabberley (2008) | Lauraceae. | ICBN |
| Cryptocaryon | Prorodontida | Lynn (2008) | . | ICZN |
| Cryptocentrum | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cryptochila | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cryptochilidium | Philasterida | Lynn (2008) | . | ICZN |
| Cryptochilum | Philasterida | Lynn (2008) | . | ICZN |
| Cryptochilus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cryptochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cryptochlora | Chlorarachniales | Ishida et al. (2007); Ota et al. (2007) | . | ICBN |
| Cryptochloris | Afrosoricida | McKenna & Bell (1997); Stanhope et al. (1998) | Chrysochloridea. | ICZN |
| Cryptochloris | Pyrenomonadales | Novarino & Gilbert (2002); Novarino (2003); Compàre (2004); McDonald et al. (2007) | Later homonym. No substitution name published, yet. | ICBN |
| Cryptocodon | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cryptocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cryptocoleopsis | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cryptocoryne | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Cryptodendrum | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cryptodicranum | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cryptodifflugia | Arcellinida | Meisterfeld (2000) | Phryganellina -- Cryptodifflugiidae. | ICZN |
| Cryptoglena | Euglenales | Leedale (1967); Leedale (2000); Marin et al. (2003) | . | ICBN |
| Cryptogonium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cryptogramma | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cryptohydra | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cryptolarella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cryptolaria | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cryptolembus | Philasterida | Lynn (2008) | . | ICZN |
| Cryptolepis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cryptoleptodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cryptolycus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cryptomeria | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Cryptomitrium | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cryptomonas | Cryptomonadales | Clay et al. (1999); Novarino (2003) | . | ICBN |
| Cryptomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cryptonemertes | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Cryptonemia | Cryptonemiales | Silva (2002); Schneider & Wynne (2007) | . | ICBN |
| Cryptonyctus | Clevelandellida | Lynn (2008) | . | ICZN |
| Cryptopapillaria | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cryptoperidiniopsis | Peridiniales | Steidinger et al. (2006) | . | ICBN |
| Cryptophaps | Columbiformes | Clements (2007) | . | ICZN |
| Cryptopharynx | Loxodida | Lynn (2008) | . | ICZN |
| Cryptophidion | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cryptophrya | Endogenida | Lynn (2008) | . | ICZN |
| Cryptophyton | Alcyonacea | Williams (2000) | Clavulariidae. | ICZN |
| Cryptopleura | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cryptopodium | Rhizogoniales | Goffinet et al. (2009) | . | ICBN |
| Cryptoprocta | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cryptopus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cryptopylos | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cryptoscincus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cryptosepalum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cryptosiphonia | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Cryptospiza | Passeriformes | Clements (2007) | . | ICZN |
| Cryptospora | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cryptosporangium | Frankiales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Cryptosporidium | | Carreno et al. (1999); Perkins et al. (2000) | . | ICZN |
| Cryptosporina | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Cryptostegia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cryptostephanus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Cryptostipula | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cryptostomina | Philasterida | Lynn (2008) | . | ICZN |
| Cryptostylis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cryptosylvicola | Passeriformes | Clements (2007) | . | ICZN |
| Cryptosyringa | Astrophorida | Uriz (2002) | . | ICZN |
| Cryptotaenia | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cryptothylax | Anura | Vitt & Caldwell (2009) | Hyperoliidae. | ICZN |
| Cryptotis | Eulipotyphla | McKenna & Bell (1997); Murphy et al. (2001) | . | ICZN |
| Cryptotriton | Caudata | Vitt & Caldwell (2009) | Plethodontidae. | ICZN |
| Cryptotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Crypturellus | Tinamiformes | Clements (2007) | . | ICZN |
| Crystallophyes | Siphonophorae | Bouillon et al. (2006) | . | ICZN |
| Csiromedusa | Narcomedusae | Gershwin & Zeidler (2010) | . | ICZN |
| Ctedoctema | Pleuronematida | Lynn (2008) | . | ICZN |
| Ctenacis | Carcharhiniformes | Nelson (2006) | . | ICZN |
| Ctenactis | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Ctenanthe | Zingiberales | Mabberley (2008) | Marantaceae. | ICBN |
| Ctenardisia | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Ctenaria | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Ctenella | Cydippida | Carré & Carré (1993) | . | ICZN |
| Ctenella | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Ctenidiadelphus | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Ctenidium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Ctenitis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Ctenium | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Ctenoblepharys | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Ctenocella | Alcyonacea | Bayer (1981); Bayer & Grasshoff (1994) | Ellisellidae. | ICZN |
| Ctenochona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Ctenoctophrys | Haptorida | Lynn (2008) | . | ICZN |
| Ctenodactylus | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ctenolepis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Ctenolophon | Malpighiales | Mabberley (2008) | Ctenolophonaceae. | ICBN |
| Ctenomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Ctenophorus | Squamata | Vitt & Caldwell (2009) | Agamidae. | ICZN |
| Ctenophryne | Anura | Vitt & Caldwell (2009) | Microhylidae. | ICZN |
| Ctenoplana | Platyctenida | Harbison & Madin (1982) | . | ICZN |
| Ctenopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Ctenosaura | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Ctenosiphonia | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Ctenotus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Ctenyura | Stolidobranchia | Monniot & Monniot (1972) | Pyuridae. | ICZN |
| Cuatrecasanthus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cuatrecasasiella | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cuatrecasasiodendron | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cuatresia | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Cubaia | Limnomedusae | Bouillon et al. (2006) | . | ICZN |
| Cubanola | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cubanthus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cubelium | Malpighiales | Mabberley (2008) | Violaceae. | ICBN |
| Cubiculosporum | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Cubilia | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Cubitanthus | Lamiales | Mabberley (2008) | Scrophulariaceae. | ICBN |
| Cuchumatanea | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cucullanorhynchus | Oligacanthorhynchida | Amin et al. (2008) | Oligacanthorhynchidae. | ICZN |
| Cuculus | Cuculiformes | Clements (2007) | . | ICZN |
| Cucumeropsis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cucumibacter | Rhizobiales | Hwang & Cho (2008) | . | ICNB |
| Cucumis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cucumophrya | Exogenida | Lynn (2008) | . | ICZN |
| Cucurbella | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Cucurbita | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cucurbitella | Arcellinida | Meisterfeld (2000) | Difflugina -- Difflugiidae. | ICZN |
| Cucurbitella | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cuenotia | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Cuervea | Celastrales | Mabberley (2008) | Celastraceae. | ICBN |
| Cuitlauzina | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Culcasia | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Culcita | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Culeolus | Stolidobranchia | Monniot & Monniot (1972); Monniot (2001) | Pyuridae. | ICZN |
| Culexiregiloricus | Nanaloricida | Gad (2009) | . | ICZN |
| Culicia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Culicicapa | Passeriformes | Clements (2007) | . | ICZN |
| Culicivora | Passeriformes | Clements (2007) | . | ICZN |
| Culicospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Culicosporella | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Cullen | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cullenia | Malvales | Mabberley (2008) | Malvaceae. | ICBN |
| Cullumia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cultellothrix | Haptorida | Lynn (2008) | . | ICZN |
| Cumagloia | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Cumarinia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Cumathamnion | Ceramiales | Schneider & Wynne (2007) | . | ICBN |
| Cuminia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cuminum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cumulopuntia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Cuneata | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hormosinidae. | ICZN |
| Cuneonemertes | Pelagica | Gibson (1995) | . | ICZN |
| Cunhaia | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Cunhamunizia | Vestibuliferida | Lynn (2008) | . | ICZN |
| Cuniculotinus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cuniculus | Rodentia | Woods & Kilpatrick (2005) | Conserved name. | ICZN |
| Cunila | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cunina | Narcomedusae | Bouillon et al. (2006) | . | ICZN |
| Cunissa | Narcomedusae | Bouillon et al. (2006) | . | ICZN |
| Cunninghamia | Cupressales | Farjon (2001); Christenhusz et al. (2011) | . | ICBN |
| Cunonia | Oxalidales | Mabberley (2008) | Cunoniaceae. | ICBN |
| Cuon | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cuora | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Cupania | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Cupaniopsis | Sapindales | Mabberley (2008) | Sapindaceae. | ICBN |
| Cupelopagis | Collothecaceae | Segers (2002); Segers (2007) | . | ICZN |
| Cuphea | Myrtales | Mabberley (2008) | Lythraceae. | ICBN |
| Cupheanthus | Myrtales | Mabberley (2008) | Myrtaceae. | ICBN |
| Cuphonotus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cupressocyparis | Cupressales | Mabberley (2008) | xCupressocyparis. Chamaecyparis x Cupressus hybrids. | ICBN |
| Cupressopathes | Antipatharia | Opresko (2001) | . | ICZN |
| Cupressus | Cupressales | Farjon (2001); Little (2006); Adams et al. (2009); Debreczy et al. (2009); Christenhusz et al. (2011) | . | ICBN |
| Cupriavidus | Burkholderiales | Garrity et al. (2005) | . | ICNB |
| Cuprocyparis | Cupressales | Mabberley (2008) | xCuprocyparis. Cupressus x Xanthocypris hybrids. | ICBN |
| Curaeus | Passeriformes | Clements (2007) | . | ICZN |
| Curarea | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Curatella | Dilleniales | Mabberley (2008) | Dilleniaceae. | ICBN |
| Curculigo | Asparagales | Mabberley (2008) | Hypoxidaceae. | ICBN |
| Curcuma | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Curdiea | Gracilariales | Schneider & Wynne (2007) | . | ICBN |
| Curimostoma | Tetrahymenida | Lynn (2008) | . | ICZN |
| Curranemertes | Reptantia | Gibson (1995); Kajihara et al. (2008) | Junior synonym of Punnettia. | ICZN |
| Cursina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Cursorius | Charadriiformes | Clements (2007) | . | ICZN |
| Curtia | Gentianales | Mabberley (2008) | Gentianaceae. | ICBN |
| Curtisia | Cornales | Mabberley (2008) | Curtisiaceae. | ICBN |
| Curtobacterium | Micrococcales | Garrity et al. (2005); Ludwig et al. (2012) | . | ICNB |
| Curtrightia | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Glabratellidae. | ICZN |
| Curupira | Santalales | Mabberley (2008) | Olacaceae. | ICBN |
| Curvibacter | Burkholderiales | Ding & Yokota (2004) | . | ICNB |
| Curvicladium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Curviramea | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cuscatlania | Caryophyllales | Mabberley (2008) | Nyctaginaceae. | ICBN |
| Cuscomys | Rodentia | Woods & Kilpatrick (2005) | . | ICZN |
| Cuscuta | Solanales | Mabberley (2008) | Convolvulaceae. | ICBN |
| Cushmanella | Robertinida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Robertinidae. | ICZN |
| Cushmanina | Lagenida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ellipsolagenidae. | ICZN |
| Cusickiella | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cuspidaria | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Cuspidatula | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cuspidella | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cuspidia | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cuspidothrix | Nostocales | Rajaiemi et al. (2005) | . | ICBN |
| Cussonia | Apiales | Mabberley (2008) | Araliaceae. | ICBN |
| Cutandia | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cutia | Passeriformes | Clements (2007) | . | ICZN |
| Cuttsia | Asterales | Mabberley (2008) | Rousseaceae. | ICBN |
| Cuviera | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cuviera | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cyamichona | Cryptogemmida | Lynn (2008) | . | ICZN |
| Cyamon | Poecilosclerida | Hooper (2002) | . | ICZN |
| Cyamopsis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cyanaeorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyananthea | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cyananthus | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cyanastrum | Asparagales | Mabberley (2008) | Tecophilaeaceae. | ICBN |
| Cyanea | Semaeostomeae | Kramp (1961) | . | ICZN |
| Cyanea | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cyanella | Asparagales | Mabberley (2008) | Tecophilaeaceae. | ICBN |
| Cyanerpes | Passeriformes | Clements (2007) | . | ICZN |
| Cyanicterus | Passeriformes | Clements (2007) | . | ICZN |
| Cyanicula | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyanidioschyzon | Cyanidiales | De Luca et al. (1978); Schneider & Wynne (2007) | Not "Cyanodioschyzon". | ICBN |
| Cyanidium | Cyanidiales | Schneider & Wynne (2007) | . | ICBN |
| Cyanistes | Passeriformes | Clements (2007) | . | ICZN |
| Cyanixia | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Cyanoaggregatum | Chroococcales | Werner et al. (2008) | . | ICBN |
| Cyanoarbor | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanobacterium | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanobium | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanobotrys | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Cyanocatena | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanocatenula | Synechococcales | Joosten (2006) | . | ICBN |
| Cyanochen | Anseriformes | Clements (2007) | . | ICZN |
| Cyanocitta | Passeriformes | Clements (2007) | . | ICZN |
| Cyanocomperia | Chroococcales | Hindak (2001) | . | ICBN |
| Cyanocompsa | Passeriformes | Clements (2007) | . | ICZN |
| Cyanocorax | Passeriformes | Clements (2007) | . | ICZN |
| Cyanocystis | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanoderma | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanodermatium | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanodictyon | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanogranis | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanokybus | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanolanius | Passeriformes | Clements (2007) | . | ICZN |
| Cyanolimnas | Gruiformes | Clements (2007) | . | ICZN |
| Cyanoliseus | Psittaciformes | Clements (2007) | . | ICZN |
| Cyanolophocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cyanoloxia | Passeriformes | Clements (2007) | . | ICZN |
| Cyanolyca | Passeriformes | Clements (2007) | . | ICZN |
| Cyanomitra | Passeriformes | Clements (2007) | . | ICZN |
| Cyanomonas | | Novarino (2003) | Domain Eucarya - Kingdom Cryptobiontes ? - Phylum Cryptophyta ?. | ICBN |
| Cyanonemertes | Eumonostilifera | Iwata (2007); Kajihara et al. (2008) | Amphiporidae. | ICZN |
| Cyanonephron | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanoneuron | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cyanophaia | Apodiformes | Clements (2007) | . | ICZN |
| Cyanophanon | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanophora | Cyanophorales | Kies & Kremer (1986) | . | ICBN |
| Cyanophthalma | Eumonostilifera | Gibson (1995); Chernyshev (2003) | . | ICZN |
| Cyanopica | Passeriformes | Clements (2007) | . | ICZN |
| Cyanopsitta | Psittaciformes | Clements (2007) | . | ICZN |
| Cyanoptila | Passeriformes | Clements (2007) | . | ICZN |
| Cyanoptyche | Gloeochaetales | Kies & Kremer (1986) | . | ICBN |
| Cyanoramphus | Psittaciformes | Clements (2007) | . | ICZN |
| Cyanosaccus | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanosarcina | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanospira | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Cyanostegia | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cyanostylon | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanotetras | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanothamnos | Synechococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanothece | Chroococcales | Hoffmann et al. (2005) | . | ICBN |
| Cyanotis | Commelinales | Mabberley (2008) | Commelinaceae. | ICBN |
| Cyanthillium | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cyathea | Cyatheales | Christenhusz et al. (2011) | . | ICBN |
| Cyathelia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Cyathella | Hexactinosida | Reiswig (2002) | . | ICZN |
| Cyathella | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cyathobasis | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Cyathobodo | Pseudodendromonadales | Cavalier-Smith & Chao (2006) | . | ICZN |
| Cyathocalyx | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cyathochaeta | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cyathocline | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cyathocoma | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cyathocormus | Aplousobranchia | Monniot & Monniot (1972); Kott (1998) | Junior synonym of Sycozoa. | ICZN |
| Cyathodes | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cyathodinium | Evaginogenida | Lynn (2008) | . | ICZN |
| Cyathodium | Marchantiales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cyathomonas | Goniomonadida | Kugrens et al. (2000) | Later synonym of Goniomonas. | ICZN |
| Cyathomone | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cyathopercularia | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Cyathophorum | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Cyathophylla | Caryophyllales | Mabberley (2008) | Caryophyllaceae. | ICBN |
| Cyathopodium | Alcyonacea | Bayer (1981) | Clavulariidae. | ICZN |
| Cyathopsis | Ericales | Mabberley (2008) | Ericaceae. | ICBN |
| Cyathopus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyathorhachis | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyathoselinum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cyathosoma | Trichomonadida | Brugerolle & Lee (2000) | Possibly later synonym of Cochlosoma. | ICZN |
| Cyathostegia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cyathostelma | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cyathostemma | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cyathothecium | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cyathotrochus | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Cyathula | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Cybebus | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cybianthus | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Cybistax | Lamiales | Mabberley (2008) | Bignoniaceae. | ICBN |
| Cybistetes | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Cycas | Cycadales | Mabberley (2008); Christenhusz et al. (2011) | . | ICBN |
| Cyclacanthia | Poecilosclerida | Samaai et al. (2004) | . | ICZN |
| Cyclacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Cyclachaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cycladenia | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cycladophora | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Cyclamen | Ericales | Mabberley (2008) | Primulaceae. | ICBN |
| Cyclammina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cyclamminidae. | ICZN |
| Cyclanorbis | Testudinata | Vitt & Caldwell (2009) | Trionychidae. | ICZN |
| Cyclanthera | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cyclantheropsis | Cucurbitales | Mabberley (2008) | Cucurbitaceae. | ICBN |
| Cyclanthus | Pandanales | Mabberley (2008) | Cyclanthaceae. | ICBN |
| Cyclarhis | Passeriformes | Clements (2007) | . | ICZN |
| Cyclea | Ranunculales | Mabberley (2008) | Menispermaceae. | ICBN |
| Cyclemys | Testudinata | Vitt & Caldwell (2009) | Geomydidae. | ICZN |
| Cyclidiopsis | Euglenales | Leedale (1967); Leedale (2000) | . | ICBN |
| Cyclidium | Pleuronematida | Lynn (2008) | . | ICZN |
| Cyclobacterium | Cytophagales | Garrity et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Cyclocanna | Leptothecata | Bouillon et al. (2006) | . | ICZN |
| Cyclocarpa | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cyclocarya | Fagales | Mabberley (2008) | Juglandaceae. | ICBN |
| Cyclocheilon | Lamiales | Mabberley (2008) | Cyclocheilaceae. | ICBN |
| Cyclocibicides | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cibicididae. | ICZN |
| Cycloclasticus | Thiotrichales | Garrity et al. (2005) | . | ICNB |
| Cycloclypeus | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Nummulitidae. | ICZN |
| Cyclocodon | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cyclocorus | Squamata | Vitt & Caldwell (2009) | Serpentes. "Colubridae". | ICZN |
| Cyclocotyla | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cycloderma | Testudinata | Vitt & Caldwell (2009) | Trionychidae. | ICZN |
| Cyclodictyon | Hookeriales | Goffinet et al. (2009) | . | ICBN |
| Cyclodina | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cyclodium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cyclodomorphus | Squamata | Vitt & Caldwell (2009) | Scincidae. | ICZN |
| Cyclodonta | Peritrichida | Lynn (2008); Zhan et al. (2009) | . | ICZN |
| Cycloforina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Hauerinidae. | ICZN |
| Cyclohelia | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cyclojoenia | Cristamonadida | Cepicka et al. (2010) | . | ICZN |
| Cyclolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cyclolepis | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cyclolobium | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cycloloma | Caryophyllales | Mabberley (2008) | Amaranthaceae. | ICBN |
| Cyclomuricea | Alcyonacea | Bayer (1981) | Acanthogorgiidae. | ICZN |
| Cyclonexis | Ochromonadales | Kristiansen & Preisig (2001); Cavalier-Smith & Chao (2006) | Chromulinaceae (biflagellate). | ICBN |
| Cyclopeltis | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cyclopes | Xenarthra | McKenna & Bell (1997) | . | ICZN |
| Cyclophrya | Evaginogenida | Lynn (2008) | . | ICZN |
| Cyclophyllum | Gentianales | Mabberley (2008) | Rubiaceae. | ICBN |
| Cyclopia | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cyclopogon | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cycloposthium | Entodiniomorphida | Lynn (2008) | . | ICZN |
| Cyclopsitta | Psittaciformes | Clements (2007) | . | ICZN |
| Cycloputeolina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Soritidae. | ICZN |
| Cyclopyxis | Arcellinida | Meisterfeld (2000) | Difflugina -- Trigonopyxidae. | ICZN |
| Cycloramphus | Anura | Vitt & Caldwell (2009) | Cycloramphidae. | ICZN |
| Cyclorbiculina | Miliolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Soritidae. | ICZN |
| Cyclorhiza | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cyclosalpa | Salpida | Godeaux (1998) | . | ICZN |
| Cycloseris | Scleractinia | Veron (2000) | . | ICZN |
| Cyclosorus | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cyclospermum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cyclospora | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Cyclotrichium | Haptorida | Lynn (2008) | . | ICZN |
| Cyclotrichium | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cyclotyphlops | Squamata | Vitt & Caldwell (2009) | Serpentes. Typhlopidae. | ICZN |
| Cyclura | Squamata | Vitt & Caldwell (2009) | Iguanidae. | ICZN |
| Cycniopsis | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Cycnium | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Cycnoches | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cydonia | Rosales | Mabberley (2008) | Rosaceae. | ICBN |
| Cygnicollum | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cygnicollum | Funariales | Goffinet et al. (2009) | . | ICBN |
| Cygniella | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cygnus | Anseriformes | Clements (2007) | . | ICZN |
| Cylicia | Scleractinia | Cairns et al. (1999) | . | ICZN |
| Cylicodiscus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cylicomorpha | Brassicales | Mabberley (2008) | Caricaceae. | ICBN |
| Cylindraxis | Nemaliales | Schneider & Wynne (2007) | . | ICBN |
| Cylindrocarpa | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cylindroclavulina | Textulariida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Valvulinidae. | ICZN |
| Cylindrocline | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cylindrocolea | Jungermanniales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cylindrocystis | Zygnematales | Gontcharov (2008) | . | ICBN |
| Cylindrogullmia | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Allogromiidae. | ICZN |
| Cylindrophis | Squamata | Vitt & Caldwell (2009) | Serpentes. Cylindrophiidae. | ICZN |
| Cylindrophyllum | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Cylindropsis | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cylindropuntia | Caryophyllales | Mabberley (2008) | Cactaceae. | ICBN |
| Cylindrospermopsis | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Cylindrospermum | Nostocales | Hoffmann et al. (2005) | . | ICBN |
| Cylindrospora | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Cymaria | Lamiales | Mabberley (2008) | Labiatae. | ICBN |
| Cymatocarpus | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cymatocylis | Tintinnida | Lynn (2008) | . | ICZN |
| Cymbalaria | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Cymbaloporella | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cymbaloporidae. | ICZN |
| Cymbaloporetta | Rotaliida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Cymbaloporidae. | ICZN |
| Cymbaria | Lamiales | Mabberley (2008) | Orobanchaceae. | ICBN |
| Cymbastela | Halichondrida | Alvarez & Hooper (2002) | . | ICZN |
| Cymbidiella | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cymbidium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cymbilaimus | Passeriformes | Clements (2007) | . | ICZN |
| Cymbirhynchus | Passeriformes | Clements (2007) | . | ICZN |
| Cymbocarpa | Dioscoreales | Mabberley (2008) | Burmanniaceae. | ICBN |
| Cymbocarpum | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cymbodinium | Noctilucales | Fensome et al. (1993) | . | ICBN |
| Cymbolaena | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cymbomonas | Pyramimonadales | Moestrup (2000) | . | ICBN |
| Cymbonotus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cymbopappus | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cymbopetalum | Magnoliales | Mabberley (2008) | Annonaceae. | ICBN |
| Cymbopogon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cymbosema | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cymodocea | Alismatales | Mabberley (2008) | Cymodoceaceae. | ICBN |
| Cymopterus | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cynanchum | Gentianales | Mabberley (2008) | Apocynaceae. | ICBN |
| Cynanthus | Apodiformes | Clements (2007) | . | ICZN |
| Cynapium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cynara | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cynarina | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Cynarospermum | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Cyne | Santalales | Mabberley (2008) | Loranthaceae. | ICBN |
| Cynictis | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cynisca | Squamata | Vitt & Caldwell (2009) | Amphisbaenidae. | ICZN |
| Cynocephalus | Dermoptera | McKenna & Bell (1997) | . | ICZN |
| Cynodon | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cynodontium | Dicranales | Goffinet et al. (2009) | . | ICBN |
| Cynogale | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cynoglossopsis | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cynoglossum | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cynoglottis | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cynometra | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cynomops | Chiroptera | Simmons (2005) | . | ICZN |
| Cynomorium | Cynomoriales | Mabberley (2008) | Cynomoriaceae. | ICBN |
| Cynomys | Rodentia | McKenna & Bell (1997) | . | ICZN |
| Cynops | Caudata | Vitt & Caldwell (2009) | Salamandridae. | ICZN |
| Cynopterus | Chiroptera | McKenna & Bell (1997) | . | ICZN |
| Cynorhiza | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cynorkis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cynosciadium | Apiales | Mabberley (2008) | Umbelliferae. | ICBN |
| Cynosurus | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyornis | Passeriformes | Clements (2007) | . | ICZN |
| Cypella | Asparagales | Mabberley (2008) | Iridaceae. | ICBN |
| Cyperochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyperus | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cyphacanthus | Lamiales | Mabberley (2008) | Acanthaceae. | ICBN |
| Cyphanthera | Solanales | Mabberley (2008) | Solanaceae. | ICBN |
| Cyphastrea | Scleractinia | Cairns et al. (1999); Veron (2000) | . | ICZN |
| Cyphia | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cyphocardamum | Brassicales | Mabberley (2008) | Cruciferae. | ICBN |
| Cyphocarpus | Asterales | Mabberley (2008) | Campanulaceae. | ICBN |
| Cyphochlaena | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyphoderia | Euglyphida | Meisterfeld (2000) | . | ICZN |
| Cyphokentia | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cypholophus | Rosales | Mabberley (2008) | Urticaceae. | ICBN |
| Cypholoron | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyphophoenix | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cyphorhinus | Passeriformes | Clements (2007) | . | ICZN |
| Cyphosperma | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cyphostemma | Vitales | Mabberley (2008) | Vitaceae. | ICBN |
| Cyphostigma | Zingiberales | Mabberley (2008) | Zingiberaceae. | ICBN |
| Cyphostyla | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Cyphotheca | Myrtales | Mabberley (2008) | Melastomataceae. | ICBN |
| Cypringlea | Poales | Mabberley (2008) | Cyperaceae. | ICBN |
| Cypripedium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cypselea | Caryophyllales | Mabberley (2008) | Aizoaceae. | ICBN |
| Cypselocarpus | Brassicales | Mabberley (2008) | Gyrostemonaceae. | ICBN |
| Cypseloides | Apodiformes | Clements (2007) | . | ICZN |
| Cypsiurus | Apodiformes | Clements (2007) | . | ICZN |
| Cypsnagra | Passeriformes | Clements (2007) | . | ICZN |
| Cyptodon | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cyptodontopsis | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cyrilia | Eucoccidiorida | Perkins et al. (2000) | . | ICZN |
| Cyrilla | Ericales | Mabberley (2008) | Cyrillaceae. | ICBN |
| Cyrillopsis | Malpighiales | Mabberley (2008) | Ixonanthaceae. | ICBN |
| Cyrtandra | Lamiales | Mabberley (2008) | Gesneriaceae. | ICBN |
| Cyrtandromoea | Lamiales | Mabberley (2008) | Plantaginaceae. | ICBN |
| Cyrtanthus | Asparagales | Mabberley (2008) | Amaryllidaceae. | ICBN |
| Cyrtaulon | Hexactinosida | Reiswig (2002) | . | ICZN |
| Cyrtidiorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyrtocarpa | Sapindales | Mabberley (2008) | Anacardiaceae. | ICBN |
| Cyrtocaryum | Apostomatida | Lynn (2008) | . | ICZN |
| Cyrtochloa | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyrtococcum | Poales | Mabberley (2008) | Gramineae. | ICBN |
| Cyrtocymura | Asterales | Mabberley (2008) | Compositae. | ICBN |
| Cyrtodactylus | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Cyrtogonellum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cyrtogonone | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cyrtohymena | Sporadotrichida | Lynn (2008) | . | ICZN |
| Cyrto-hypnum | Hypnales | Goffinet et al. (2009) | . | ICBN |
| Cyrtomidictyum | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cyrtomium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cyrtomnium | Bryales | Goffinet et al. (2009) | . | ICBN |
| Cyrtonia | Ploima | Segers (2002); Segers (2007) | . | ICZN |
| Cyrtonyx | Galliformes | Clements (2007) | . | ICZN |
| Cyrtopera | Nassellaria | Anderson et al. (2000) | . | ICZN |
| Cyrtophoron | Chlamydodontida | Lynn (2008) | . | ICZN |
| Cyrtopodendron | Hypnodendrales | Goffinet et al. (2009) | . | ICBN |
| Cyrtopodion | Squamata | Vitt & Caldwell (2009) | Gekkonidae. | ICZN |
| Cyrtopodium | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyrtopus | Hypnodendrales | Goffinet et al. (2009) | . | ICBN |
| Cyrtorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyrtorhyncha | Ranunculales | Mabberley (2008) | Ranunculaceae. | ICBN |
| Cyrtosia | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cyrtosperma | Alismatales | Mabberley (2008) | Araceae. | ICBN |
| Cyrtosphaera | Coccolithales | Jordan et al. (2004); Edvardsen & Medlin (2007) | Rhabdosphaeraceae. | ICBN |
| Cyrtostachys | Arecales | Mabberley (2008) | Palmae. | ICBN |
| Cyrtostrombidium | Strombidiida | Lynn (2008) | . | ICZN |
| Cyrtostylis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cystammina | Lituolida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Ammosphaeroidinidae. | ICZN |
| Cystamminoides | Trochamminida | Kaminski (2008) | Trochammininae. | ICZN |
| Cystiactis | Actiniaria | Fautin et al. (2007) | . | ICZN |
| Cysticapnos | Ranunculales | Mabberley (2008) | Papaveraceae. | ICBN |
| Cystoathyrium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cystobacter | Myxococcales | Garrity et al. (2005) | . | ICNB |
| Cystocephaloides | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cystocephalus | Eugregarinorida | Perkins et al. (2000) | . | ICZN |
| Cystochytrium | Hyphochytriales | Dick (2001); Kirk et al. (2008) | Hyphochytriaceae. | ICBN |
| Cystoclonium | Gigartinales | Schneider & Wynne (2007) | . | ICBN |
| Cystodinedria | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Cystodinium | Phytodiniales | Fensome et al. (1993) | . | ICBN |
| Cystodium | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cystodytes | Aplousobranchia | Monniot & Monniot (1972); Monniot (2001) | Polycitoridae. | ICZN |
| Cystoisospora | Eucoccidiorida | Barta et al. (2005) | . | ICZN |
| Cystolejeunea | Porellales | Crandall-Stotler et al. (2009) | . | ICBN |
| Cystophora | Carnivora | McKenna & Bell (1997) | . | ICZN |
| Cystophrys | Allogromiida | Loeblich Jr. & Tappan (1988); Loeblich Jr. & Tappan (1992) | Lagynidae. | ICZN |
| Cystopteris | Polypodiales | Christenhusz et al. (2011) | . | ICBN |
| Cystorchis | Asparagales | Mabberley (2008) | Orchidaceae. | ICBN |
| Cystosiphon | Pythiales | Dick (2001); Kirk et al. (2008) | Pythiaceae. | ICBN |
| Cystosporogenes | Microsporida | Canning & Vavra (2000) | . | ICZN |
| Cystostemon | Boraginales | Mabberley (2008) | Boraginaceae. | ICBN |
| Cytaeis | Anthoathecata | Bouillon et al. (2006) | . | ICZN |
| Cytauxzoon | Piroplasmorida | Reichard et al. (2005) | . | ICZN |
| Cytharoides | Euplotida | Lynn (2008) | . | ICZN |
| Cytinus | Malvales | Mabberley (2008) | Cytinaceae. | ICBN |
| Cytisophyllum | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cytisopsis | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cytisus | Fabales | Mabberley (2008) | Leguminosae. | ICBN |
| Cytogonidium | Poales | Mabberley (2008) | Restionaceae. | ICBN |
| Cytophaga | Cytophagales | Garrity et al. (2005); Ludwig et al. (2011) | . | ICNB |
| Cyttaranthus | Malpighiales | Mabberley (2008) | Euphorbiaceae. | ICBN |
| Cyttarocylis | Tintinnida | Lynn (2008) | . | ICZN |
| Cyttarops | Chiroptera | McKenna & Bell (1997) | . | ICZN |