| averrhoa carambola | Yes | species | eukaryota | plants | species | 28974 | click here |
| aves | Yes | | | vertebrates | class | 8782 | click here |
| avicennia germinans | Yes | species | eukaryota | plants | species | 41378 | click here |
| avicennia marina | Yes | species | eukaryota | plants | species | 82927 | click here |
| axinella corrugata | Yes | species | eukaryota | invertebrates | species | 153946 | click here |
| axinella dissimilis | Yes | species | eukaryota | invertebrates | species | 798306 | click here |
| axinella verrucosa | Yes | species | eukaryota | invertebrates | species | 237119 | click here |
| axinyssa | Yes | | | invertebrates | genus | 237149 | click here |
| axis axis | Yes | species | eukaryota | mammals | species | 30531 | click here |
| axonopus purpusii | Yes | species | | | species | 1213450 | click here |
| axos cliftoni | Yes | species | eukaryota | invertebrates | species | 283613 | click here |
| azadirachta indica | Yes | species | eukaryota | plants | species | 124943 | click here |
| azanus mirza | Yes | species | eukaryota | invertebrates | species | 482363 | click here |
| azolla caroliniana | Yes | species | eukaryota | plants | species | 39631 | click here |
| azolla filiculoides | Yes | species | eukaryota | plants | species | 84609 | click here |
| azolla mexicana | Yes | species | eukaryota | plants | species | 336973 | click here |
| azteca | Yes | | | invertebrates | genus | 121511 | click here |
| azteca alfari | Yes | species | | | species | 602825 | click here |
| azteca instabilis | Yes | species | eukaryota | invertebrates | species | 602870 | click here |
| azumapecten farreri | Yes | species | eukaryota | invertebrates | species | 106299 | click here |
| baccharis trimera | Yes | species | | | species | 1486033 | click here |
| bacteria | Yes | | | bacteria | superkingdom | 2 | click here |
| bactericera cockerelli | Yes | species | eukaryota | invertebrates | species | 290155 | click here |
| bactericera maculipennis | Yes | species | | | species | 1579206 | click here |
| bacterium | Yes | no rank | | | species | 1869227 | click here |
| bactra passercula | Yes | species | | | species | 1371516 | click here |
| bactris gasipaes | Yes | species | eukaryota | plants | species | 154467 | click here |
| bactrocera correcta | Yes | species | eukaryota | invertebrates | species | 47773 | click here |
| bactrocera cucurbitae | Yes | species | eukaryota | invertebrates | species | 28588 | click here |
| bactrocera dorsalis | Yes | species | eukaryota | invertebrates | species | 27457 | click here |
| bactrocera minax | Yes | species | eukaryota | invertebrates | species | 104690 | click here |
| bactrocera oleae | Yes | species | eukaryota | invertebrates | species | 104688 | click here |
| bactrocera papayae | Yes | species | eukaryota | invertebrates | species | 69547 | click here |
| bactrocera tau | Yes | species | eukaryota | invertebrates | species | 137263 | click here |
| badumna longinqua | Yes | species | eukaryota | invertebrates | species | 389029 | click here |
| balaenoptera acutorostrata | Yes | species | eukaryota | mammals | species | 9767 | click here |
| balaenoptera borealis | Yes | species | eukaryota | mammals | species | 9768 | click here |
| balaenoptera brydei | Yes | species | eukaryota | mammals | species | 255365 | click here |
| balantiopteryx plicata | Yes | species | eukaryota | mammals | species | 249010 | click here |
| balclutha | Yes | | | invertebrates | genus | 74051 | click here |
| balclutha brevis | Yes | species | | | species | 1720327 | click here |
| balclutha incisa | Yes | species | | | species | 1401693 | click here |
| balizia pedicellaris | Yes | species | | | species | 560015 | click here |
| balloniscus | Yes | | | | genus | 749384 | click here |
| balloniscus sellowii | Yes | species | | | species | 749386 | click here |
| balta notulata | Yes | species | | | species | 1902165 | click here |
| bandicota bengalensis | Yes | species | eukaryota | rodents | species | 69079 | click here |
| bandicota indica | Yes | species | eukaryota | rodents | species | 456472 | click here |
| bandicota savilei | Yes | species | eukaryota | rodents | species | 456473 | click here |
| baptisia bracteata | Yes | species | eukaryota | plants | species | 313912 | click here |
| baptisia tinctoria | Yes | species | eukaryota | plants | species | 49797 | click here |
| barypeithes pellucidus | Yes | species | eukaryota | invertebrates | species | 397350 | click here |
| basilia | Yes | | | invertebrates | genus | 170889 | click here |
| bauhinia petersiana | Yes | species | eukaryota | plants | species | 653069 | click here |
| bazzania trilobata | Yes | species | eukaryota | plants | species | 13808 | click here |
| bembidion punctulatum | Yes | species | eukaryota | invertebrates | species | 795073 | click here |
| bemisia afer | Yes | species | eukaryota | invertebrates | species | 166114 | click here |
| bemisia tabaci | Yes | species | eukaryota | invertebrates | species | 7038 | click here |
| bemisia tabaci complex sp. asia i | Yes | no rank | | | species | 1518964 | click here |
| bemisia tuberculata | Yes | species | eukaryota | invertebrates | species | 176122 | click here |
| berosus luridus | Yes | species | eukaryota | invertebrates | species | 290647 | click here |
| berylmys berdmorei | Yes | species | eukaryota | rodents | species | 595394 | click here |
| berylmys bowersi | Yes | species | eukaryota | rodents | species | 83759 | click here |
| beryx splendens | Yes | species | eukaryota | vertebrates | species | 88663 | click here |
| beta vulgaris | Yes | species | eukaryota | plants | species | 161934 | click here |
| beta vulgaris subsp. vulgaris | Yes | subspecies | eukaryota | plants | subspecies | 3555 | click here |
| bethylidae | Yes | | | invertebrates | family | 27508 | click here |
| betta splendens | Yes | species | eukaryota | vertebrates | species | 158456 | click here |
| betula | Yes | | | plants | genus | 3504 | click here |
| betula pendula | Yes | species | eukaryota | plants | species | 3505 | click here |
| betulaphis pelei | Yes | species | | | species | 1064609 | click here |
| bichromomyia flaviscutellata | Yes | species | | | species | 1629504 | click here |
| bicyclus anisops | Yes | species | eukaryota | invertebrates | species | 887218 | click here |
| bicyclus auricruda | Yes | species | eukaryota | invertebrates | species | 887211 | click here |
| bicyclus dentata | Yes | species | eukaryota | invertebrates | species | 887212 | click here |
| bicyclus ephorus | Yes | species | | | species | 1457353 | click here |
| bicyclus evadne | Yes | species | eukaryota | invertebrates | species | 887223 | click here |
| bicyclus funebris | Yes | species | eukaryota | invertebrates | species | 270009 | click here |
| bicyclus ignobilis | Yes | species | eukaryota | invertebrates | species | 887229 | click here |
| bicyclus italus | Yes | species | eukaryota | invertebrates | species | 887231 | click here |
| bicyclus mandanes | Yes | species | eukaryota | invertebrates | species | 270010 | click here |
| bicyclus nobilis | Yes | species | | | species | 2005912 | click here |
| bicyclus pavonis | Yes | species | eukaryota | invertebrates | species | 887239 | click here |
| bicyclus sanaos | Yes | species | eukaryota | invertebrates | species | 887841 | click here |
| bicyclus sangmelinae | Yes | species | eukaryota | invertebrates | species | 887216 | click here |
| bicyclus sylvicolus | Yes | species | | | species | 1457354 | click here |
| bicyclus taenias | Yes | species | eukaryota | invertebrates | species | 887249 | click here |
| bicyclus trilophus | Yes | species | eukaryota | invertebrates | species | 887251 | click here |
| bicyclus vulgaris | Yes | species | eukaryota | invertebrates | species | 887254 | click here |
| bicyclus xeneas | Yes | species | eukaryota | invertebrates | species | 887255 | click here |
| bidens pilosa | Yes | species | eukaryota | plants | species | 42337 | click here |
| bifurcaria bifurcata | Yes | species | eukaryota | plants | species | 74462 | click here |
| biorhiza pallida | Yes | species | eukaryota | invertebrates | species | 75178 | click here |
| biserrula pelecinus | Yes | species | eukaryota | plants | species | 47093 | click here |
| bison | Yes | | | mammals | genus | 9900 | click here |
| bison bison | Yes | species | eukaryota | mammals | species | 9901 | click here |
| bison bison athabascae | Yes | subspecies | eukaryota | mammals | subspecies | 43347 | click here |
| bison bison bison | Yes | subspecies | | | subspecies | 43346 | click here |
| bison bonasus | Yes | species | eukaryota | mammals | species | 9902 | click here |
| bistorta vivipara | Yes | species | eukaryota | plants | species | 371026 | click here |