| [21543] Acanthallagma luteum | Appellations de Taxon | 21543 |
| [21544] Acar | Appellations de Taxon | 21544 |
| [21545] Acar domingensis | Appellations de Taxon | 21545 |
| [21546] Aciliini | Appellations de Taxon | 21546 |
| [21547] Acteocina | Appellations de Taxon | 21547 |
| [21548] Acteocina bullata | Appellations de Taxon | 21548 |
| [21549] Acteocina candei | Appellations de Taxon | 21549 |
| [2155] Lota | Appellations de Taxon | 2155 |
| [21550] Acteonoidea | Appellations de Taxon | 21550 |
| [21551] Adelphotectonica | Appellations de Taxon | 21551 |
| [21552] Adelphotectonica uruguaya | Appellations de Taxon | 21552 |
| [21553] Adrana | Appellations de Taxon | 21553 |
| [21554] Adrana gloriosa | Appellations de Taxon | 21554 |
| [21555] Adrana patagonica | Appellations de Taxon | 21555 |
| [21556] Adrana tellinoides | Appellations de Taxon | 21556 |
| [21557] Aeolagrion | Appellations de Taxon | 21557 |
| [21558] Aeolagrion dorsale | Appellations de Taxon | 21558 |
| [21559] Aequipecten linki | Appellations de Taxon | 21559 |
| [2156] Lota lota | Appellations de Taxon | 2156 |
| [21560] Aeschnosoma | Appellations de Taxon | 21560 |
| [21561] Aeschnosoma elegans | Appellations de Taxon | 21561 |
| [21562] Aeschnosoma forcipula | Appellations de Taxon | 21562 |
| [21563] Aeshninae | Appellations de Taxon | 21563 |
| [21564] Aeshnini | Appellations de Taxon | 21564 |
| [21565] Aeshnoidea | Appellations de Taxon | 21565 |
| [21566] Agladrillia | Appellations de Taxon | 21566 |
| [21567] Agladrillia rhodochroa | Appellations de Taxon | 21567 |
| [21568] Agria | Appellations de Taxon | 21568 |
| [21569] Argia thespis | Appellations de Taxon | 21569 |
| [2157] Merlangius | Appellations de Taxon | 2157 |
| [21570] Argia translata | Appellations de Taxon | 21570 |
| [21571] Agriinae | Appellations de Taxon | 21571 |
| [21572] Aliger | Appellations de Taxon | 21572 |
| [21575] Amaea | Appellations de Taxon | 21575 |
| [21576] Amaea mitchelli | Appellations de Taxon | 21576 |
| [21577] Ambrysini | Appellations de Taxon | 21577 |
| [21578] Ambrysus | Appellations de Taxon | 21578 |
| [21579] Ambrysus stali | Appellations de Taxon | 21579 |
| [2158] Merlangius merlangus | Appellations de Taxon | 2158 |
| [21580] Ambrysus usingeri | Appellations de Taxon | 21580 |
| [21581] Ampullarioidea | Appellations de Taxon | 21581 |
| [21582] Amygdalum | Appellations de Taxon | 21582 |
| [21583] Amygdalum politum | Appellations de Taxon | 21583 |
| [21584] Amygdalum sagittatum | Appellations de Taxon | 21584 |
| [21585] Anacroneuria | Appellations de Taxon | 21585 |
| [21586] Anacroneuria pictipes | Appellations de Taxon | 21586 |
| [21587] Acroneuriinae | Appellations de Taxon | 21587 |
| [21588] Anacroneuriini | Appellations de Taxon | 21588 |
| [21589] Anactini | Appellations de Taxon | 21589 |
| [2159] Pollachius | Appellations de Taxon | 2159 |