| aaptos aaptos | Yes | species | eukaryota | invertebrates | species | 253165 | click here |
| abramis brama | Yes | species | eukaryota | vertebrates | species | 38527 | click here |
| abrornis humei | Yes | species | eukaryota | vertebrates | species | 48151 | click here |
| abrornis inornata | Yes | species | eukaryota | vertebrates | species | 56436 | click here |
| abroscopus schisticeps | Yes | species | eukaryota | vertebrates | species | 565568 | click here |
| abroscopus superciliaris | Yes | species | eukaryota | vertebrates | species | 330771 | click here |
| abrothrix longipilis | Yes | species | eukaryota | rodents | species | 29094 | click here |
| abrothrix olivaceus | Yes | species | eukaryota | rodents | species | 29098 | click here |
| abrothrix sanborni | Yes | species | | | species | 682468 | click here |
| acalymma vittatum | Yes | species | eukaryota | invertebrates | species | 133117 | click here |
| acanthagenys rufogularis | Yes | species | eukaryota | vertebrates | species | 266413 | click here |
| acanthastrea | Yes | | | invertebrates | genus | 51050 | click here |
| acanthastrea echinata | Yes | species | eukaryota | invertebrates | species | 51051 | click here |
| acanthastrea hemprichii | Yes | species | | | species | 1216035 | click here |
| acanthastrea lordhowensis | Yes | species | | | species | 1216036 | click here |
| acanthastrea subechinata | Yes | species | | | species | 1328283 | click here |
| acanthis flammea | Yes | species | eukaryota | vertebrates | species | 54769 | click here |
| acanthiza katherina | Yes | species | eukaryota | vertebrates | species | 117190 | click here |
| acanthodactylus boskianus | Yes | species | eukaryota | vertebrates | species | 111507 | click here |
| acanthodactylus erythrurus belli | Yes | subspecies | eukaryota | vertebrates | subspecies | 282408 | click here |
| acanthorhynchus tenuirostris | Yes | species | eukaryota | vertebrates | species | 266336 | click here |
| acartia | Yes | | | invertebrates | genus | 121148 | click here |
| acartia clausii | Yes | species | eukaryota | invertebrates | species | 136140 | click here |
| acartia erythraea | Yes | species | eukaryota | invertebrates | species | 748991 | click here |
| acartia negligens | Yes | species | eukaryota | invertebrates | species | 545072 | click here |
| acartia pacifica | Yes | species | eukaryota | invertebrates | species | 335913 | click here |
| acartia tonsa | Yes | species | eukaryota | invertebrates | species | 136180 | click here |
| acarus siro | Yes | species | eukaryota | invertebrates | species | 66546 | click here |
| accipiter badius | Yes | species | | | species | 387787 | click here |
| accipiter brevipes | Yes | species | | | species | 387791 | click here |
| accipiter cooperii | Yes | species | eukaryota | vertebrates | species | 261198 | click here |
| accipiter gentilis | Yes | species | eukaryota | vertebrates | species | 8957 | click here |
| accipiter melanoleucus | Yes | species | | | species | 387800 | click here |
| accipiter nisus | Yes | species | eukaryota | vertebrates | species | 211598 | click here |
| accipiter soloensis | Yes | species | eukaryota | vertebrates | species | 387806 | click here |
| accipiter striatus | Yes | species | eukaryota | vertebrates | species | 56330 | click here |
| accipiter tachiro | Yes | species | eukaryota | vertebrates | species | 387808 | click here |
| accipiter trivirgatus | Yes | species | eukaryota | vertebrates | species | 210844 | click here |
| accipiter virgatus | Yes | species | eukaryota | vertebrates | species | 387810 | click here |
| acinonyx jubatus | Yes | species | eukaryota | mammals | species | 32536 | click here |
| acomys cahirinus | Yes | species | eukaryota | rodents | species | 10068 | click here |
| acomys dimidiatus | Yes | species | eukaryota | rodents | species | 60744 | click here |
| acomys russatus | Yes | species | eukaryota | rodents | species | 60746 | click here |
| acomys sp. | Yes | no rank | eukaryota | rodents | species | 60743 | click here |
| acridotheres cristatellus | Yes | species | eukaryota | vertebrates | species | 451382 | click here |
| acridotheres tristis | Yes | species | eukaryota | vertebrates | species | 279927 | click here |
| acrocephalus aedon | Yes | species | eukaryota | vertebrates | species | 68478 | click here |
| acrocephalus arundinaceus | Yes | species | eukaryota | vertebrates | species | 39621 | click here |
| acrocephalus baeticatus | Yes | species | eukaryota | vertebrates | species | 68472 | click here |
| acrocephalus cinnamomeus | Yes | species | | | species | 1402877 | click here |
| acrocephalus dumetorum | Yes | species | eukaryota | vertebrates | species | 68474 | click here |
| acrocephalus gracilirostris | Yes | species | eukaryota | vertebrates | species | 68482 | click here |
| acrocephalus griseldis | Yes | species | eukaryota | vertebrates | species | 68479 | click here |
| acrocephalus melanopogon | Yes | species | eukaryota | vertebrates | species | 68470 | click here |
| acrocephalus mendanae | Yes | species | eukaryota | vertebrates | species | 435338 | click here |
| acrocephalus newtoni | Yes | species | eukaryota | vertebrates | species | 68480 | click here |
| acrocephalus orientalis | Yes | species | eukaryota | vertebrates | species | 68483 | click here |
| acrocephalus palustris | Yes | species | eukaryota | vertebrates | species | 68475 | click here |
| acrocephalus schoenobaenus | Yes | species | eukaryota | vertebrates | species | 52609 | click here |
| acrocephalus scirpaceus | Yes | species | eukaryota | vertebrates | species | 48156 | click here |
| acrocephalus scirpaceus fuscus | Yes | subspecies | eukaryota | vertebrates | subspecies | 126888 | click here |
| acrocephalus sechellensis | Yes | species | eukaryota | vertebrates | species | 68481 | click here |
| acrocephalus stentoreus | Yes | species | eukaryota | vertebrates | species | 68485 | click here |
| acropora | Yes | | | invertebrates | genus | 6127 | click here |
| acropora aspera | Yes | species | eukaryota | invertebrates | species | 140238 | click here |
| acropora cervicornis | Yes | species | eukaryota | invertebrates | species | 6130 | click here |
| acropora clathrata | Yes | species | | | species | 877182 | click here |
| acropora cytherea | Yes | species | eukaryota | invertebrates | species | 46686 | click here |
| acropora digitifera | Yes | species | eukaryota | invertebrates | species | 70779 | click here |
| acropora divaricata | Yes | species | eukaryota | invertebrates | species | 117776 | click here |
| acropora downingi | Yes | species | | | species | 1391135 | click here |
| acropora florida | Yes | species | eukaryota | invertebrates | species | 70782 | click here |
| acropora formosa | Yes | species | eukaryota | invertebrates | species | 126732 | click here |
| acropora gemmifera | Yes | species | eukaryota | invertebrates | species | 70780 | click here |
| acropora glauca | Yes | species | | | species | 1869258 | click here |
| acropora humilis | Yes | species | eukaryota | invertebrates | species | 46687 | click here |
| acropora hyacinthus | Yes | species | eukaryota | invertebrates | species | 55974 | click here |
| acropora intermedia | Yes | species | eukaryota | invertebrates | species | 114500 | click here |
| acropora japonica | Yes | species | | | species | 1216037 | click here |
| acropora latistella | Yes | species | eukaryota | invertebrates | species | 6129 | click here |
| acropora loisetteae | Yes | species | eukaryota | invertebrates | species | 564432 | click here |
| acropora longicyathus | Yes | species | eukaryota | invertebrates | species | 55975 | click here |
| acropora loripes | Yes | species | eukaryota | invertebrates | species | 154029 | click here |
| acropora millepora | Yes | species | eukaryota | invertebrates | species | 45264 | click here |
| acropora muricata | Yes | species | eukaryota | invertebrates | species | 159855 | click here |
| acropora nasuta | Yes | species | eukaryota | invertebrates | species | 70778 | click here |
| acropora nobilis | Yes | species | eukaryota | invertebrates | species | 70781 | click here |
| acropora palmata | Yes | species | eukaryota | invertebrates | species | 6131 | click here |
| acropora polystoma | Yes | species | eukaryota | invertebrates | species | 513076 | click here |
| acropora pruinosa | Yes | species | | | species | 1045499 | click here |
| acropora pulchra | Yes | species | eukaryota | invertebrates | species | 140239 | click here |
| acropora sarmentosa | Yes | species | eukaryota | invertebrates | species | 154030 | click here |
| acropora solitaryensis | Yes | species | eukaryota | invertebrates | species | 513077 | click here |
| acropora spathulata | Yes | species | eukaryota | invertebrates | species | 141011 | click here |
| acropora spicifera | Yes | species | eukaryota | invertebrates | species | 191023 | click here |
| acropora tenuis | Yes | species | eukaryota | invertebrates | species | 70783 | click here |
| acropora valida | Yes | species | eukaryota | invertebrates | species | 55976 | click here |
| acropora yongei | Yes | species | eukaryota | invertebrates | species | 117778 | click here |
| acrozoanthus australiae | Yes | species | eukaryota | invertebrates | species | 470414 | click here |
| actenoides lindsayi | Yes | species | eukaryota | vertebrates | species | 342376 | click here |