| abbottina rivularis | Yes | species | eukaryota | vertebrates | species | 75332 | click here |
| abramis brama | Yes | species | eukaryota | vertebrates | species | 38527 | click here |
| acanthobrama marmid | Yes | species | eukaryota | vertebrates | species | 155076 | click here |
| acinonyx jubatus | Yes | species | eukaryota | mammals | species | 32536 | click here |
| acomys cahirinus | Yes | species | eukaryota | rodents | species | 10068 | click here |
| acrocheilus alutaceus | Yes | species | eukaryota | vertebrates | species | 67537 | click here |
| actinopterygii | Yes | | | vertebrates | class | 7898 | click here |
| addax nasomaculatus | Yes | species | eukaryota | mammals | species | 59515 | click here |
| aepyceros melampus | Yes | species | eukaryota | mammals | species | 9897 | click here |
| aepyprymnus rufescens | Yes | species | eukaryota | mammals | species | 38598 | click here |
| aethomys chrysophilus | Yes | species | eukaryota | rodents | species | 121561 | click here |
| aetobatus narinari | Yes | species | eukaryota | vertebrates | species | 87140 | click here |
| aetobatus narutobiei | Yes | species | | | species | 1640655 | click here |
| aetobatus ocellatus | Yes | species | | | species | 1053712 | click here |
| aetomylaeus bovinus | Yes | species | | | species | 1820958 | click here |
| aetomylaeus nichofii | Yes | species | eukaryota | vertebrates | species | 495821 | click here |
| aetomylaeus vespertilio | Yes | species | eukaryota | vertebrates | species | 495822 | click here |
| aetoplatea zonura | Yes | species | eukaryota | vertebrates | species | 195284 | click here |
| ageneiosus | Yes | | | vertebrates | genus | 238654 | click here |
| ageneiosus inermis | Yes | species | eukaryota | vertebrates | species | 642921 | click here |
| ageneiosus ucayalensis | Yes | species | eukaryota | vertebrates | species | 238655 | click here |
| agkistrodon piscivorus | Yes | species | eukaryota | vertebrates | species | 8715 | click here |
| agriolimax | Yes | | | | | | click here |
| akodon azarae | Yes | species | eukaryota | rodents | species | 29095 | click here |
| alburnus alburnus | Yes | species | eukaryota | vertebrates | species | 54556 | click here |
| alburnus neretvae | Yes | no rank | eukaryota | vertebrates | species | 742355 | click here |
| alcelaphus buselaphus | Yes | species | eukaryota | mammals | species | 59517 | click here |
| alcelaphus caama | Yes | species | eukaryota | mammals | species | 59519 | click here |
| alces alces | Yes | species | eukaryota | mammals | species | 9852 | click here |
| alces alces gigas | Yes | subspecies | eukaryota | mammals | subspecies | 341674 | click here |
| alces americanus | Yes | species | eukaryota | mammals | species | 999462 | click here |
| alectoris barbara | Yes | species | eukaryota | vertebrates | species | 40177 | click here |
| alectoris rufa | Yes | species | eukaryota | vertebrates | species | 9079 | click here |
| alepocephalus rostratus | Yes | species | | | species | 1245468 | click here |
| alopias pelagicus | Yes | species | eukaryota | vertebrates | species | 57979 | click here |
| alopias superciliosus | Yes | species | eukaryota | vertebrates | species | 57980 | click here |
| alopias vulpinus | Yes | species | eukaryota | vertebrates | species | 7852 | click here |
| alosa fallax | Yes | species | eukaryota | vertebrates | species | 278165 | click here |
| alticola strelzowi | Yes | species | eukaryota | rodents | species | 400186 | click here |
| aluterus monoceros | Yes | species | eukaryota | vertebrates | species | 479862 | click here |
| amazonetta brasiliensis | Yes | species | eukaryota | vertebrates | species | 75867 | click here |
| ambloplites rupestris | Yes | species | eukaryota | vertebrates | species | 109273 | click here |
| amblyraja doellojuradoi | Yes | species | eukaryota | vertebrates | species | 458547 | click here |
| amblyraja radiata | Yes | species | eukaryota | vertebrates | species | 386614 | click here |
| ambystoma tigrinum | Yes | species | eukaryota | vertebrates | species | 8305 | click here |
| ameiurus melas | Yes | species | eukaryota | vertebrates | species | 219545 | click here |
| ameiurus nebulosus | Yes | species | eukaryota | vertebrates | species | 27778 | click here |
| amia calva | Yes | species | eukaryota | vertebrates | species | 7924 | click here |
| ammodramus humeralis | Yes | species | eukaryota | vertebrates | species | 218194 | click here |
| amphiesma stolatum | Yes | species | eukaryota | vertebrates | species | 186574 | click here |
| anas | Yes | | | vertebrates | genus | 8835 | click here |
| anas bahamensis | Yes | species | eukaryota | vertebrates | species | 75834 | click here |
| anas crecca | Yes | species | eukaryota | vertebrates | species | 75839 | click here |
| anas diazi | Yes | species | eukaryota | vertebrates | species | 75841 | click here |
| anas discors | Yes | species | eukaryota | vertebrates | species | 75842 | click here |
| anas platyrhynchos | Yes | species | eukaryota | vertebrates | species | 8839 | click here |
| anas querquedula | Yes | species | eukaryota | vertebrates | species | 75856 | click here |
| anchoa mitchilli | Yes | species | eukaryota | vertebrates | species | 224718 | click here |
| andinoacara coeruleopunctatus | Yes | species | eukaryota | vertebrates | species | 318583 | click here |
| andropadus latirostris | Yes | species | eukaryota | vertebrates | species | 59950 | click here |
| anguilla anguilla | Yes | species | eukaryota | vertebrates | species | 7936 | click here |
| anguilla marmorata | Yes | species | eukaryota | vertebrates | species | 7939 | click here |
| angulus versicolor | Yes | species | | | species | 723539 | click here |
| anisotarsus | Yes | | | | | | click here |
| anoxypristis cuspidata | Yes | species | eukaryota | vertebrates | species | 195290 | click here |
| anser albifrons | Yes | species | eukaryota | vertebrates | species | 50365 | click here |
| anser caerulescens | Yes | species | eukaryota | vertebrates | species | 8849 | click here |
| anser indicus | Yes | species | eukaryota | vertebrates | species | 8846 | click here |
| antaresia maculosa | Yes | species | eukaryota | vertebrates | species | 51891 | click here |
| antidorcas marsupialis | Yes | species | eukaryota | mammals | species | 59523 | click here |
| anura | Yes | | | vertebrates | order | 8342 | click here |
| apalone spinifera | Yes | species | eukaryota | vertebrates | species | 55534 | click here |
| apalone spinifera hartwegi | Yes | subspecies | eukaryota | vertebrates | subspecies | 387429 | click here |
| apodemus | Yes | | | rodents | genus | 10128 | click here |
| apodemus agrarius | Yes | species | eukaryota | rodents | species | 39030 | click here |
| apodemus argenteus | Yes | species | eukaryota | rodents | species | 61837 | click here |
| apodemus flavicollis | Yes | species | eukaryota | rodents | species | 54292 | click here |
| apodemus mystacinus | Yes | species | eukaryota | rodents | species | 100382 | click here |
| apodemus peninsulae | Yes | species | eukaryota | rodents | species | 105297 | click here |
| apodemus speciosus | Yes | species | eukaryota | rodents | species | 105296 | click here |
| apodemus sylvaticus | Yes | species | eukaryota | rodents | species | 10129 | click here |
| apodemus uralensis | Yes | species | eukaryota | rodents | species | 134910 | click here |
| apodemus witherbyi | Yes | species | eukaryota | rodents | species | 400054 | click here |
| apomys datae | Yes | species | eukaryota | rodents | species | 238002 | click here |
| apomys microdon | Yes | species | eukaryota | rodents | species | 238006 | click here |
| apristurus laurussonii | Yes | species | eukaryota | vertebrates | species | 164746 | click here |
| aptenodytes forsteri | Yes | species | eukaryota | vertebrates | species | 9233 | click here |
| aquila nipalensis | Yes | species | eukaryota | vertebrates | species | 193005 | click here |
| arctocephalus australis | Yes | species | eukaryota | mammals | species | 161928 | click here |
| arctocephalus gazella | Yes | species | eukaryota | mammals | species | 37190 | click here |
| arctocephalus pusillus | Yes | species | eukaryota | mammals | species | 37191 | click here |
| arctocephalus pusillus pusillus | Yes | subspecies | eukaryota | mammals | subspecies | 37192 | click here |
| argopecten purpuratus | Yes | species | eukaryota | invertebrates | species | 228297 | click here |
| ariopsis felis | Yes | species | eukaryota | vertebrates | species | 75286 | click here |
| arvicanthis niloticus | Yes | species | eukaryota | rodents | species | 61156 | click here |
| arvicanthis sp. | Yes | no rank | eukaryota | rodents | species | 61158 | click here |
| arvicola amphibius | Yes | species | | | species | 1047088 | click here |
| aspidites ramsayi | Yes | species | eukaryota | vertebrates | species | 461326 | click here |
| ateles geoffroyi | Yes | species | eukaryota | primates | species | 9509 | click here |
| atherina boyeri | Yes | species | eukaryota | vertebrates | species | 87785 | click here |