| amblyomma geoemydae | Yes | species | | | species | 1325863 | click here |
| amblyomma goeldii | Yes | species | eukaryota | invertebrates | species | 251384 | click here |
| amblyomma hadanii | Yes | species | | | species | 1508514 | click here |
| amblyomma hebraeum | Yes | species | eukaryota | invertebrates | species | 34608 | click here |
| amblyomma helvolum | Yes | species | | | species | 1274520 | click here |
| amblyomma humerale | Yes | species | eukaryota | invertebrates | species | 251385 | click here |
| amblyomma imitator | Yes | species | eukaryota | invertebrates | species | 568067 | click here |
| amblyomma incisum | Yes | species | eukaryota | invertebrates | species | 295025 | click here |
| amblyomma inornatum | Yes | species | | | species | 1664859 | click here |
| amblyomma latepunctatum | Yes | species | eukaryota | invertebrates | species | 295026 | click here |
| amblyomma latum | Yes | species | eukaryota | invertebrates | species | 34617 | click here |
| amblyomma lepidum | Yes | species | | invertebrates | species | 492568 | click here |
| amblyomma loculosum | Yes | species | | | species | 1424621 | click here |
| amblyomma longirostre | Yes | species | eukaryota | invertebrates | species | 251386 | click here |
| amblyomma maculatum | Yes | species | eukaryota | invertebrates | species | 34609 | click here |
| amblyomma mixtum | Yes | species | | | species | 1581418 | click here |
| amblyomma multipunctum | Yes | species | | | species | 1309578 | click here |
| amblyomma naponense | Yes | species | eukaryota | invertebrates | species | 251387 | click here |
| amblyomma neumanni | Yes | species | eukaryota | invertebrates | species | 251388 | click here |
| amblyomma nodosum | Yes | species | eukaryota | invertebrates | species | 231480 | click here |
| amblyomma oblongoguttatum | Yes | species | eukaryota | invertebrates | species | 251389 | click here |
| amblyomma ovale | Yes | species | eukaryota | invertebrates | species | 208206 | click here |
| amblyomma pacae | Yes | species | eukaryota | invertebrates | species | 251390 | click here |
| amblyomma parkeri | Yes | species | eukaryota | invertebrates | species | 570282 | click here |
| amblyomma parvitarsum | Yes | species | eukaryota | invertebrates | species | 260089 | click here |
| amblyomma parvum | Yes | species | eukaryota | invertebrates | species | 251391 | click here |
| amblyomma pecarium | Yes | species | eukaryota | invertebrates | species | 251392 | click here |
| amblyomma pomposum | Yes | species | | invertebrates | species | | click here |
| amblyomma pseudoconcolor | Yes | species | eukaryota | invertebrates | species | 251394 | click here |
| amblyomma rhinocerotis | Yes | species | eukaryota | invertebrates | species | 127002 | click here |
| amblyomma rotundatum | Yes | species | eukaryota | invertebrates | species | 251395 | click here |
| amblyomma sabanerae | Yes | species | eukaryota | invertebrates | species | 705546 | click here |
| amblyomma scalpturatum | Yes | species | eukaryota | invertebrates | species | 251396 | click here |
| amblyomma sculptum | Yes | species | | | species | 1581419 | click here |
| amblyomma sparsum | Yes | species | eukaryota | invertebrates | species | 127003 | click here |
| amblyomma sylvaticum | Yes | species | | | species | 1506266 | click here |
| amblyomma tapirellum | Yes | species | eukaryota | invertebrates | species | 251398 | click here |
| amblyomma testudinarium | Yes | species | eukaryota | invertebrates | species | 375577 | click here |
| amblyomma tholloni | Yes | species | | | species | 1701308 | click here |
| amblyomma tigrinum | Yes | species | eukaryota | invertebrates | species | 251399 | click here |
| amblyomma triguttatum | Yes | species | eukaryota | invertebrates | species | 65637 | click here |
| amblyomma triguttatum triguttatum | Yes | subspecies | eukaryota | invertebrates | subspecies | 65638 | click here |
| amblyomma triste | Yes | species | eukaryota | invertebrates | species | 251400 | click here |
| amblyomma tuberculatum | Yes | species | eukaryota | invertebrates | species | 48802 | click here |
| amblyomma varanense | Yes | species | | | species | 1274518 | click here |
| amblyomma variegatum | Yes | species | eukaryota | invertebrates | species | 34610 | click here |
| amblyomma varium | Yes | species | eukaryota | invertebrates | species | 251401 | click here |
| amblyptilia punctidactyla | Yes | species | | | species | 1594227 | click here |
| ambrosia trifida | Yes | species | eukaryota | plants | species | 4214 | click here |
| amitus hesperidum | Yes | species | | | species | 1001193 | click here |
| amitus sp. | Yes | no rank | eukaryota | invertebrates | species | 81080 | click here |
| ammodendron bifolium | Yes | species | eukaryota | plants | species | 247904 | click here |
| ammophila arenaria | Yes | species | eukaryota | plants | species | 96047 | click here |
| ammopiptanthus | Yes | | | plants | genus | 111850 | click here |
| ammospermophilus leucurus | Yes | species | eukaryota | rodents | species | 45488 | click here |
| amoeba proteus | Yes | species | eukaryota | invertebrates | species | 5775 | click here |
| amorpha canescens | Yes | species | eukaryota | plants | species | 252450 | click here |
| amorpha fruticosa | Yes | species | eukaryota | plants | species | 48131 | click here |
| amphicarpaea bracteata | Yes | species | eukaryota | plants | species | 45679 | click here |
| amphicarpaea edgeworthii | Yes | species | eukaryota | plants | species | 132429 | click here |
| amphimedon | Yes | | | invertebrates | genus | 178513 | click here |
| amphimedon viridis | Yes | species | eukaryota | invertebrates | species | 178517 | click here |
| amphiroa anceps | Yes | species | | | species | 1034373 | click here |
| amygdalaria | Yes | | | plants | genus | 273076 | click here |
| anabas testudineus | Yes | species | eukaryota | vertebrates | species | 64144 | click here |
| anadara trapezia | Yes | species | eukaryota | invertebrates | species | 6556 | click here |
| anadenanthera colubrina | Yes | species | eukaryota | plants | species | 148671 | click here |
| anadenanthera peregrina | Yes | species | eukaryota | plants | species | 148672 | click here |
| anagyris foetida | Yes | species | eukaryota | plants | species | 49793 | click here |
| anagyris latifolia | Yes | species | eukaryota | plants | species | 655818 | click here |
| ananas comosus | Yes | species | eukaryota | plants | species | 4615 | click here |
| anaphalis lactea | Yes | species | | | species | 481985 | click here |
| anaphes nitens | Yes | species | eukaryota | invertebrates | species | 279597 | click here |
| anaplasma ovis | Yes | species | bacteria | bacteria | species | 142058 | click here |
| anas crecca | Yes | species | eukaryota | vertebrates | species | 75839 | click here |
| anas platyrhynchos | Yes | species | eukaryota | vertebrates | species | 8839 | click here |
| anastrepha | Yes | | | invertebrates | genus | 28585 | click here |
| anastrepha amita | Yes | species | eukaryota | invertebrates | species | 95490 | click here |
| anastrepha fraterculus | Yes | species | eukaryota | invertebrates | species | 95504 | click here |
| anastrepha grandis | Yes | species | eukaryota | invertebrates | species | 87114 | click here |
| anastrepha obliqua | Yes | species | eukaryota | invertebrates | species | 95512 | click here |
| anastrepha pickeli | Yes | species | eukaryota | invertebrates | species | 95516 | click here |
| anastrepha serpentina | Yes | species | eukaryota | invertebrates | species | 43388 | click here |
| anastrepha sororcula | Yes | species | eukaryota | invertebrates | species | 95519 | click here |
| anastrepha striata | Yes | species | eukaryota | invertebrates | species | 95521 | click here |
| anax guttatus | Yes | species | eukaryota | invertebrates | species | 410891 | click here |
| anaxyrus americanus | Yes | species | eukaryota | vertebrates | species | 8389 | click here |
| ancistrocerus antilope | Yes | species | eukaryota | invertebrates | species | 427959 | click here |
| ancistrotropis peduncularis | Yes | species | eukaryota | plants | species | 77331 | click here |
| ancylopus pictus | Yes | species | | | species | 701785 | click here |
| andamia tetradactylus | Yes | species | | | species | 879702 | click here |
| andira inermis | Yes | species | eukaryota | plants | species | 53825 | click here |
| andrena | Yes | | | invertebrates | genus | 48720 | click here |
| andrena barbilabris | Yes | species | eukaryota | invertebrates | species | 586954 | click here |
| andrena chrysosceles | Yes | species | | | species | 1411665 | click here |
| andrena cineraria | Yes | species | eukaryota | invertebrates | species | 465493 | click here |
| andrena clarkella | Yes | species | | | species | 1190796 | click here |
| andrena dorsata | Yes | species | | | species | 1411666 | click here |
| andrena fulva | Yes | species | | | species | 1411667 | click here |
| andrena fuscipes | Yes | species | | | species | 1190800 | click here |