| cinara maghrebica | Yes | species | | | species | 506605 | click here |
| cinara medispinosa | Yes | species | | | species | 1421467 | click here |
| cinara moketa | Yes | species | | | species | 1421468 | click here |
| cinara murrayanae | Yes | species | eukaryota | invertebrates | species | 230868 | click here |
| cinara neubergi | Yes | species | | | species | 1421469 | click here |
| cinara nigra | Yes | species | eukaryota | invertebrates | species | 230861 | click here |
| cinara nuda | Yes | species | | | species | 1421470 | click here |
| cinara occidentalis | Yes | species | eukaryota | invertebrates | species | 527607 | click here |
| cinara oregonensis | Yes | species | | | species | 1925523 | click here |
| cinara palaestinensis | Yes | species | | | species | 1421472 | click here |
| cinara parvicornis | Yes | species | | | species | 1655952 | click here |
| cinara pectinatae | Yes | species | | | species | 1421473 | click here |
| cinara pergandei | Yes | species | eukaryota | invertebrates | species | 230858 | click here |
| cinara petersoni | Yes | species | | | species | 1421474 | click here |
| cinara piceae | Yes | species | | | species | 1244012 | click here |
| cinara pilicornis | Yes | species | | | species | 506607 | click here |
| cinara pinea | Yes | species | eukaryota | invertebrates | species | 97058 | click here |
| cinara pini | Yes | species | | | species | 1421475 | click here |
| cinara piniarmandicola | Yes | species | | | species | 1244013 | click here |
| cinara piniformosana | Yes | species | | | species | 1689213 | click here |
| cinara pinikoraiensis | Yes | species | | | species | 1244014 | click here |
| cinara pinimaritimae | Yes | species | | | species | 506606 | click here |
| cinara piniphila | Yes | species | | | species | 1244015 | click here |
| cinara pinivora | Yes | species | eukaryota | invertebrates | species | 230867 | click here |
| cinara ponderosae | Yes | species | eukaryota | invertebrates | species | 97062 | click here |
| cinara pruiniviridis | Yes | species | | | species | 1244016 | click here |
| cinara pruinosa | Yes | species | | | species | 1421476 | click here |
| cinara pseudotaxifoliae | Yes | species | eukaryota | invertebrates | species | 97063 | click here |
| cinara pseudotsugae | Yes | species | | | species | 1497354 | click here |
| cinara puerca | Yes | species | eukaryota | invertebrates | species | 230857 | click here |
| cinara schwarzii | Yes | species | eukaryota | invertebrates | species | 230849 | click here |
| cinara shinjii | Yes | species | | | species | 1689214 | click here |
| cinara sitchensis | Yes | species | | | species | 1421477 | click here |
| cinara solitaria | Yes | species | | | species | 1421478 | click here |
| cinara splendens | Yes | species | | | species | 1497361 | click here |
| cinara strobi | Yes | species | eukaryota | invertebrates | species | 230869 | click here |
| cinara taedae | Yes | species | | | species | 1689205 | click here |
| cinara terminalis | Yes | species | eukaryota | invertebrates | species | 230850 | click here |
| cinara thatcheri | Yes | species | | | species | 1925521 | click here |
| cinara todocola | Yes | species | | | species | 1689206 | click here |
| cinara tujafilina | Yes | species | eukaryota | invertebrates | species | 198323 | click here |
| cinara vandykei | Yes | species | | | species | 1421479 | click here |
| cinara wahluca | Yes | species | | | species | 1421480 | click here |
| cinara wahtolca | Yes | species | eukaryota | invertebrates | species | 230853 | click here |
| cinara watanabei | Yes | species | | | species | 1689216 | click here |
| cinara watsoni | Yes | species | eukaryota | invertebrates | species | 230859 | click here |
| ciona intestinalis | Yes | species | eukaryota | invertebrates | species | 7719 | click here |
| circus cyaneus | Yes | species | eukaryota | vertebrates | species | 43466 | click here |
| cirrhinus molitorella | Yes | species | eukaryota | vertebrates | species | 172907 | click here |
| cirrhinus mrigala | Yes | species | eukaryota | vertebrates | species | 683832 | click here |
| cissus quadrangularis | Yes | species | eukaryota | plants | species | 165298 | click here |
| citellophilus tesquorum | Yes | species | eukaryota | invertebrates | species | 506900 | click here |
| citellophilus tesquorum altaicus | Yes | subspecies | eukaryota | invertebrates | subspecies | 542841 | click here |
| citrullus lanatus | Yes | species | eukaryota | plants | species | 3654 | click here |
| citrullus lanatus subsp. vulgaris | Yes | subspecies | eukaryota | plants | subspecies | 260674 | click here |
| citrus | Yes | | | plants | genus | 2706 | click here |
| citrus aurantiifolia | Yes | species | eukaryota | plants | species | 159033 | click here |
| citrus limon | Yes | species | eukaryota | plants | species | 2708 | click here |
| citrus limonia | Yes | species | eukaryota | plants | species | 171249 | click here |
| citrus maxima | Yes | species | eukaryota | plants | species | 37334 | click here |
| citrus reticulata | Yes | species | eukaryota | plants | species | 85571 | click here |
| citrus sinensis | Yes | species | eukaryota | plants | species | 2711 | click here |
| citrus x microcarpa | Yes | subspecies | eukaryota | plants | species | 164113 | click here |
| citrus x paradisi | Yes | subspecies | eukaryota | plants | species | 37656 | click here |
| civettictis civetta | Yes | species | eukaryota | mammals | species | 94186 | click here |
| cixius wagneri | Yes | species | eukaryota | invertebrates | species | 472720 | click here |
| cladonia metacorallifera | Yes | species | eukaryota | plants | species | 195773 | click here |
| clangula hyemalis | Yes | species | eukaryota | vertebrates | species | 197941 | click here |
| clarias batrachus | Yes | species | eukaryota | vertebrates | species | 59899 | click here |
| clarias fuscus | Yes | species | eukaryota | vertebrates | species | 33541 | click here |
| clarias gariepinus | Yes | species | eukaryota | vertebrates | species | 13013 | click here |
| clarias magur | Yes | species | | | species | 1594786 | click here |
| clausena | Yes | | | plants | genus | 76958 | click here |
| clausena lansium | Yes | species | eukaryota | plants | species | 159037 | click here |
| clemmys guttata | Yes | species | eukaryota | vertebrates | species | 85608 | click here |
| cliona celata | Yes | species | eukaryota | invertebrates | species | 269049 | click here |
| clitoria fairchildiana | Yes | species | | | species | 560020 | click here |
| clitoria ternatea | Yes | species | eukaryota | plants | species | 43366 | click here |
| clivia miniata | Yes | species | eukaryota | plants | species | 16049 | click here |
| cnaphalocrocis medinalis | Yes | species | eukaryota | invertebrates | species | 437488 | click here |
| coccidae | Yes | | | invertebrates | family | 30189 | click here |
| coccinellidae | Yes | | | invertebrates | family | 7080 | click here |
| coccus | Yes | | | invertebrates | genus | 538669 | click here |
| coccus viridis | Yes | species | eukaryota | invertebrates | species | 589264 | click here |
| cochliomyia macellaria | Yes | species | eukaryota | invertebrates | species | 66361 | click here |
| cocos nucifera | Yes | species | eukaryota | plants | species | 13894 | click here |
| codonopsis pilosula | Yes | species | eukaryota | plants | species | 86864 | click here |
| coelacanthimorpha | Yes | | | vertebrates | subclass | 118072 | click here |
| coelostomidia jenniferae | Yes | species | | | species | 1328937 | click here |
| coelostomidia pilosa | Yes | species | | | species | 1328939 | click here |
| coffea | Yes | | | plants | genus | 13442 | click here |
| coffea arabica | Yes | species | eukaryota | plants | species | 13443 | click here |
| coffea liberica var. dewevrei | Yes | varietas | eukaryota | plants | varietas | 213301 | click here |
| coilia dussumieri | Yes | species | | | species | 1195463 | click here |
| colchicum autumnale | Yes | species | eukaryota | plants | species | 45005 | click here |
| coleostephus myconis | Yes | species | eukaryota | plants | species | 99042 | click here |
| colinus virginianus | Yes | species | eukaryota | vertebrates | species | 9014 | click here |
| colius striatus | Yes | species | eukaryota | vertebrates | species | 57412 | click here |
| colletes cunicularius | Yes | species | eukaryota | invertebrates | species | 420711 | click here |
| colletes halophilus | Yes | species | eukaryota | invertebrates | species | 338705 | click here |