| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acridoidea | 1 | 0 | 0 |
| Acrocephalidae | 1 | 0 | 0 |
| Acrocephalus Naumann, JA, Naumann & JF 1811 | 1 | 2 | 0 |
| Acrocephalus arundinaceus (Linnaeus 1758) (Great Reed Warbler) | 0 | 2 | 0 |
| Actiniaria (sea anemones) | 1 | 2 | 0 |
| Actiniidae Rafinesque 1815 | 1 | 0 | 0 |
| Actinobacteria | 1 | 0 | 0 |
| Actinobacteria | 1 | 0 | 0 |
| Actinobacteridae | 1 | 0 | 0 |
| Actinomycetales | 2 | 0 | 0 |
| Actinopterygii (ray-finned fishes) | 7 | 2 | 0 |
| Aculeata | 3 | 0 | 0 |
| Aculepeira | 1 | 0 | 0 |
| Aculepeira ceropegia (Walckenaer 1802) | 0 | 2 | 0 |
| Adalia (ladybird beetles) | 1 | 0 | 0 |
