| corvus splendens | Yes | species | eukaryota | vertebrates | species | 701737 | click here |
| corvus splendens splendens | Yes | subspecies | | | subspecies | 1214234 | click here |
| corynorhinus townsendii | Yes | species | eukaryota | mammals | species | 124745 | click here |
| cottocomephorus grewingki | Yes | species | eukaryota | vertebrates | species | 57734 | click here |
| coturnix | Yes | | | vertebrates | genus | 9090 | click here |
| coturnix coturnix | Yes | species | eukaryota | vertebrates | species | 9091 | click here |
| coturnix japonica | Yes | species | eukaryota | vertebrates | species | 93934 | click here |
| crax blumenbachii | Yes | species | eukaryota | vertebrates | species | 125061 | click here |
| cricetomys gambianus | Yes | species | eukaryota | rodents | species | 10085 | click here |
| cricetulus griseus | Yes | species | eukaryota | rodents | species | 10029 | click here |
| cricetulus longicaudatus | Yes | species | eukaryota | rodents | species | 10030 | click here |
| cricetulus migratorius | Yes | species | eukaryota | rodents | species | 10032 | click here |
| cricetus cricetus | Yes | species | eukaryota | rodents | species | 10034 | click here |
| crinifer piscator | Yes | species | eukaryota | vertebrates | species | 119408 | click here |
| crithagra mozambica | Yes | species | | | species | 1892170 | click here |
| crocidura | Yes | | | mammals | genus | 36801 | click here |
| crocidura flavescens | Yes | species | eukaryota | mammals | species | 214442 | click here |
| crocidura hirta | Yes | species | eukaryota | mammals | species | 214444 | click here |
| crocidura lasiura | Yes | species | eukaryota | mammals | species | 167043 | click here |
| crocidura leucodon | Yes | species | eukaryota | mammals | species | 109474 | click here |
| crocidura olivieri | Yes | species | eukaryota | mammals | species | 214449 | click here |
| crocidura russula | Yes | species | eukaryota | mammals | species | 36802 | click here |
| crocidura shantungensis | Yes | species | eukaryota | mammals | species | 183721 | click here |
| crocuta crocuta | Yes | species | eukaryota | mammals | species | 9678 | click here |
| crotalus atrox | Yes | species | eukaryota | vertebrates | species | 8730 | click here |
| crotalus catalinensis | Yes | species | eukaryota | vertebrates | species | 125866 | click here |
| crotalus cerastes | Yes | species | eukaryota | vertebrates | species | 8746 | click here |
| crotalus durissus terrificus | Yes | subspecies | eukaryota | vertebrates | subspecies | 8732 | click here |
| crotalus horridus | Yes | species | eukaryota | vertebrates | species | 35024 | click here |
| crotalus lepidus klauberi | Yes | subspecies | eukaryota | vertebrates | subspecies | 125877 | click here |
| crotalus molossus molossus | Yes | subspecies | eukaryota | vertebrates | subspecies | 31151 | click here |
| crotalus molossus nigrescens | Yes | subspecies | eukaryota | vertebrates | subspecies | 8734 | click here |
| crustacea | Yes | | | invertebrates | subphylum | 6657 | click here |
| cryptoblepharus virgatus | Yes | species | | | species | 2058948 | click here |
| crypturellus obsoletus | Yes | species | eukaryota | vertebrates | species | 858303 | click here |
| crypturellus parvirostris | Yes | species | eukaryota | vertebrates | species | 198471 | click here |
| crypturellus tataupa | Yes | species | eukaryota | vertebrates | species | 57238 | click here |
| crypturellus undulatus | Yes | species | eukaryota | vertebrates | species | 48396 | click here |
| ctenopharyngodon idella | Yes | species | eukaryota | vertebrates | species | 7959 | click here |
| cucumis melo | Yes | species | eukaryota | plants | species | 3656 | click here |
| cucumis sativus | Yes | species | eukaryota | plants | species | 3659 | click here |
| cucurbita pepo | Yes | species | eukaryota | plants | species | 3663 | click here |
| cucurbita pepo var. melopepo | Yes | varietas | eukaryota | plants | varietas | 3665 | click here |
| culex | Yes | | | invertebrates | genus | 7174 | click here |
| culex annulioris | Yes | species | eukaryota | invertebrates | species | 667566 | click here |
| culex annulirostris | Yes | species | eukaryota | invertebrates | species | 162997 | click here |
| culex australicus | Yes | species | eukaryota | invertebrates | species | 260110 | click here |
| culex bitaeniorhynchus | Yes | species | eukaryota | invertebrates | species | 69822 | click here |
| culex decens | Yes | species | eukaryota | invertebrates | species | 299630 | click here |
| culex dunni | Yes | species | | | species | 1273079 | click here |
| culex edwardsi | Yes | species | | | species | 1041092 | click here |
| culex globocoxitus | Yes | species | | | species | 1806176 | click here |
| culex perfuscus | Yes | species | | | species | 864588 | click here |
| culex pipiens | Yes | species | eukaryota | invertebrates | species | 7175 | click here |
| culex pipiens pallens | Yes | subspecies | eukaryota | invertebrates | subspecies | 42434 | click here |
| culex portesi | Yes | species | eukaryota | invertebrates | species | 284563 | click here |
| culex pseudovishnui | Yes | species | eukaryota | invertebrates | species | 100677 | click here |
| culex quinquefasciatus | Yes | species | eukaryota | invertebrates | species | 7176 | click here |
| culex restuans | Yes | species | eukaryota | invertebrates | species | 38742 | click here |
| culex salinarius | Yes | species | eukaryota | invertebrates | species | 38743 | click here |
| culex sitiens | Yes | species | eukaryota | invertebrates | species | 162998 | click here |
| culex tarsalis | Yes | species | eukaryota | invertebrates | species | 7177 | click here |
| culex tritaeniorhynchus | Yes | species | eukaryota | invertebrates | species | 7178 | click here |
| culicidae | Yes | | | invertebrates | family | 7157 | click here |
| culicinae | Yes | | | invertebrates | subfamily | 43817 | click here |
| culicoides | Yes | | | invertebrates | genus | 41820 | click here |
| culicoides arakawae | Yes | species | eukaryota | invertebrates | species | 198116 | click here |
| culicoides austropalpalis | Yes | | | | | 467355 | click here |
| culicoides brevitarsis | Yes | species | eukaryota | invertebrates | species | 469753 | click here |
| culicoides cataneii | Yes | species | eukaryota | invertebrates | species | 309025 | click here |
| culicoides imicola | Yes | species | eukaryota | invertebrates | species | 88399 | click here |
| culicoides insignis | Yes | species | | | species | 909053 | click here |
| culicoides obsoletus | Yes | species | eukaryota | invertebrates | species | 289301 | click here |
| culicoides oxystoma | Yes | species | eukaryota | invertebrates | species | 469749 | click here |
| culicoides peregrinus | Yes | species | eukaryota | invertebrates | species | 469759 | click here |
| culicoides punctatus | Yes | species | eukaryota | invertebrates | species | 41821 | click here |
| culicoides sonorensis | Yes | species | eukaryota | invertebrates | species | 179676 | click here |
| culicoides stellifer | Yes | species | | | species | 1890934 | click here |
| culicoides submaritimus | Yes | species | eukaryota | invertebrates | species | 309044 | click here |
| culicoides univittatus | Yes | species | | | species | 2865974 | click here |
| culiseta melanura | Yes | species | eukaryota | invertebrates | species | 329109 | click here |
| cyanocitta cristata | Yes | species | eukaryota | vertebrates | species | 28727 | click here |
| cyanopica cyanus | Yes | species | eukaryota | vertebrates | species | 193059 | click here |
| cyanoramphus auriceps | Yes | species | eukaryota | vertebrates | species | 114432 | click here |
| cyclopterus lumpus | Yes | species | eukaryota | vertebrates | species | 8103 | click here |
| cygnus | Yes | | | vertebrates | genus | 8867 | click here |
| cygnus atratus | Yes | species | eukaryota | vertebrates | species | 8868 | click here |
| cygnus buccinator | Yes | species | eukaryota | vertebrates | species | 48397 | click here |
| cygnus columbianus | Yes | species | eukaryota | vertebrates | species | 110926 | click here |
| cygnus cygnus | Yes | species | eukaryota | vertebrates | species | 219595 | click here |
| cygnus melancoryphus | Yes | species | eukaryota | vertebrates | species | 41691 | click here |
| cygnus olor | Yes | species | eukaryota | vertebrates | species | 8869 | click here |
| cymatogaster aggregata | Yes | species | eukaryota | vertebrates | species | 50794 | click here |
| cymbidium | Yes | | | plants | genus | 14366 | click here |
| cynara cardunculus | Yes | species | eukaryota | plants | species | 4265 | click here |
| cynictis penicillata | Yes | species | eukaryota | mammals | species | 41010 | click here |
| cynodon dactylon | Yes | species | eukaryota | plants | species | 28909 | click here |
| cynoglossus | Yes | | | vertebrates | genus | 106173 | click here |
| cynomops | Yes | | | mammals | genus | 303306 | click here |
| cynomops abrasus | Yes | species | eukaryota | mammals | species | 748910 | click here |