| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acantholabrus | 1 | 0 | 0 |
| Acantholabrus palloni (Risso 1810) (Scale-rayed Wrasse) | 0 | 0 | 1 |
| Acanthonyx | 1 | 0 | 0 |
| Acanthonyx lunulatus | 0 | 0 | 1 |
| Acar Gray 1857 | 1 | 0 | 0 |
| Acar clathrata (Defrance 1816) | 0 | 0 | 1 |
| Acarospora (cracked lichen) | 1 | 0 | 0 |
| Acarospora fuscata | 0 | 0 | 1 |
| Acarosporaceae | 1 | 0 | 0 |
| Acarosporales | 1 | 0 | 0 |
| Acasta Leach 1817 | 1 | 0 | 0 |
| Acasta spongites (Poli 1791) | 0 | 0 | 1 |
| Accipitridae (hawks, eagles, and relatives) | 1 | 0 | 0 |
| Accipitriformes (raptors) | 1 | 0 | 0 |
| Achaeus Leach 1817 (Decorator spider crab) | 2 | 0 | 0 |
