| agrilus ribesi | Yes | species | eukaryota | invertebrates | species | 324829 | click here |
| agriphila tristella | Yes | species | | | species | 1594226 | click here |
| agrius convolvuli | Yes | species | eukaryota | invertebrates | species | 55055 | click here |
| ahnfeltia | Yes | | | plants | genus | 28022 | click here |
| aiceona himalaica | Yes | species | | | species | 1064607 | click here |
| ailanthus altissima | Yes | species | eukaryota | plants | species | 23810 | click here |
| ailanthus excelsa | Yes | species | | | species | 1133704 | click here |
| ailanthus triphysa | Yes | species | eukaryota | plants | species | 459110 | click here |
| ailurus fulgens | Yes | species | eukaryota | mammals | species | 9649 | click here |
| akashiwo sanguinea | Yes | species | eukaryota | plants | species | 143672 | click here |
| akodon | Yes | | | rodents | genus | 10069 | click here |
| akodon azarae | Yes | species | eukaryota | rodents | species | 29095 | click here |
| akodon cursor | Yes | species | eukaryota | rodents | species | 29096 | click here |
| akodon montensis | Yes | species | eukaryota | rodents | species | 106112 | click here |
| albizia | Yes | | | plants | genus | 3812 | click here |
| albizia forbesii | Yes | species | | | species | 992636 | click here |
| albizia gummifera | Yes | species | | | species | 1561840 | click here |
| albizia julibrissin | Yes | species | eukaryota | plants | species | 3813 | click here |
| albizia kalkora | Yes | species | eukaryota | plants | species | 199156 | click here |
| albizia lebbeck | Yes | species | eukaryota | plants | species | 371650 | click here |
| albizia odoratissima | Yes | species | | | species | 1191454 | click here |
| albizia versicolor | Yes | species | eukaryota | plants | species | 138525 | click here |
| alcelaphus buselaphus | Yes | species | eukaryota | mammals | species | 59517 | click here |
| alces alces | Yes | species | eukaryota | mammals | species | 9852 | click here |
| alces alces gigas | Yes | subspecies | eukaryota | mammals | subspecies | 341674 | click here |
| alces alces shirasi | Yes | subspecies | eukaryota | mammals | subspecies | 225176 | click here |
| alces americanus | Yes | species | eukaryota | mammals | species | 999462 | click here |
| alcyonium digitatum | Yes | species | eukaryota | invertebrates | species | 51768 | click here |
| alectoria | Yes | | | plants | genus | 111638 | click here |
| aleeta curvicosta | Yes | species | | | species | 1218668 | click here |
| aleochara bilineata | Yes | species | eukaryota | invertebrates | species | 135921 | click here |
| aleurocanthus woglumi | Yes | species | | | species | 594258 | click here |
| aleurodicus dispersus | Yes | species | eukaryota | invertebrates | species | 267823 | click here |
| aleurotrachelus | Yes | | | invertebrates | genus | 593800 | click here |
| alexandrium catenella | Yes | species | eukaryota | plants | species | 2925 | click here |
| alexandrium lusitanicum | Yes | species | eukaryota | plants | species | 2938 | click here |
| alexandrium minutum | Yes | species | eukaryota | plants | species | 39455 | click here |
| alexandrium ostenfeldii | Yes | species | eukaryota | plants | species | 40986 | click here |
| alexandrium tamarense | Yes | species | eukaryota | plants | species | 2926 | click here |
| alexandrium tamiyavanichi | Yes | species | eukaryota | plants | species | 201731 | click here |
| aleyrodoidea | Yes | | | invertebrates | superfamily | 33377 | click here |
| alhagi | Yes | | | plants | genus | 47036 | click here |
| alhagi maurorum | Yes | species | eukaryota | plants | species | 47037 | click here |
| alhagi sparsifolia | Yes | species | eukaryota | plants | species | 218100 | click here |
| alkanna tinctoria | Yes | species | eukaryota | plants | species | 543564 | click here |
| allenrolfea vaginata | Yes | species | eukaryota | plants | species | 270127 | click here |
| allium aflatunense | Yes | species | eukaryota | plants | species | 70752 | click here |
| allium cepa | Yes | species | eukaryota | plants | species | 4679 | click here |
| allium sativum | Yes | species | eukaryota | plants | species | 4682 | click here |
| allium tuberosum | Yes | species | eukaryota | plants | species | 4683 | click here |
| allium ursinum | Yes | species | eukaryota | plants | species | 4684 | click here |
| allobates talamancae | Yes | species | eukaryota | vertebrates | species | 51951 | click here |
| alloglossidium corti | Yes | species | | | species | 913096 | click here |
| allonemobius fasciatus | Yes | species | eukaryota | invertebrates | species | 292203 | click here |
| allonemobius socius | Yes | species | eukaryota | invertebrates | species | 208665 | click here |
| alnus | Yes | | | plants | genus | 3515 | click here |
| alopecosa pulverulenta | Yes | species | eukaryota | invertebrates | species | 75003 | click here |
| alphaproteobacteria bacterium | Yes | no rank | | | species | 1913988 | click here |
| alpinia officinarum | Yes | species | eukaryota | plants | species | 199623 | click here |
| alpinia purpurata | Yes | species | eukaryota | plants | species | 230707 | click here |
| alstonia scholaris | Yes | species | eukaryota | plants | species | 52822 | click here |
| altica aenescens | Yes | species | | | species | 1390101 | click here |
| altica birmanensis | Yes | species | | | species | 1390102 | click here |
| altica brevicollis | Yes | species | | | species | 1390103 | click here |
| altica carinthiaca | Yes | species | eukaryota | invertebrates | species | 346690 | click here |
| altica engstroemi | Yes | species | | | species | 1390105 | click here |
| altica ericeti | Yes | species | | | species | 1390106 | click here |
| altica helianthemi | Yes | species | | | species | 1390107 | click here |
| altica impressicollis | Yes | species | | | species | 1390108 | click here |
| altica lythri | Yes | species | eukaryota | invertebrates | species | 346691 | click here |
| altica oleracea | Yes | species | eukaryota | invertebrates | species | 404226 | click here |
| altica palustris | Yes | species | | | species | 877768 | click here |
| altica quercetorum | Yes | species | | | species | 1390110 | click here |
| altica sp. 1 rj-2013 | Yes | no rank | | | species | 1390113 | click here |
| alvinella pompejana | Yes | species | eukaryota | invertebrates | species | 6376 | click here |
| alysicarpus vaginalis | Yes | species | eukaryota | plants | species | 858910 | click here |
| alyssum serpyllifolium | Yes | species | eukaryota | plants | species | 226043 | click here |
| alyssum serpyllifolium subsp. serpyllifolium | Yes | subspecies | eukaryota | plants | subspecies | 226044 | click here |
| amalaraeus penicilliger | Yes | species | | | species | 488444 | click here |
| amanita muscaria | Yes | species | eukaryota | plants | species | 41956 | click here |
| amaurobioides africana | Yes | species | | | species | 1883454 | click here |
| amblyomma | Yes | | | invertebrates | genus | 6942 | click here |
| amblyomma americanum | Yes | species | eukaryota | invertebrates | species | 6943 | click here |
| amblyomma aureolatum | Yes | species | eukaryota | invertebrates | species | 187763 | click here |
| amblyomma auricularium | Yes | species | eukaryota | invertebrates | species | 251377 | click here |
| amblyomma brasiliense | Yes | species | eukaryota | invertebrates | species | 257691 | click here |
| amblyomma cajennense | Yes | species | eukaryota | invertebrates | species | 34607 | click here |
| amblyomma calcaratum | Yes | species | eukaryota | invertebrates | species | 231478 | click here |
| amblyomma coelebs | Yes | species | eukaryota | invertebrates | species | 251378 | click here |
| amblyomma cohaerens | Yes | species | | | species | 1210879 | click here |
| amblyomma compressum | Yes | species | | | species | 1104675 | click here |
| amblyomma cooperi | Yes | species | eukaryota | invertebrates | species | 251379 | click here |
| amblyomma dissimile | Yes | species | eukaryota | invertebrates | species | 251381 | click here |
| amblyomma dubitatum | Yes | species | eukaryota | invertebrates | species | 321419 | click here |
| amblyomma eburneum | Yes | species | | | species | 1701304 | click here |
| amblyomma exornatum | Yes | species | | | species | 2586829 | click here |
| amblyomma fimbriatum | Yes | species | eukaryota | invertebrates | species | 65641 | click here |
| amblyomma fuscum | Yes | species | | | species | 1283705 | click here |
| amblyomma geayi | Yes | species | eukaryota | invertebrates | species | 251383 | click here |
| amblyomma gemma | Yes | species | | invertebrates | species | 492567 | click here |