| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Actinochrysophyceae | 0 | 2 | 0 |
| Actinomyces Harz 1877 | 1 | 2 | 0 |
| Actinomyces israelii | 0 | 2 | 0 |
| Actinomycetaceae | 1 | 2 | 0 |
| Actinomycetales | 8 | 2 | 0 |
| Actinomycineae | 1 | 0 | 0 |
| Actinopterygii (ray-finned fishes) | 12 | 2 | 0 |
| Actitis Illiger 1811 | 2 | 0 | 0 |
| Actitis hypoleucos (Linnaeus 1758) (Common Sandpiper) | 0 | 2 | 0 |
| Actitis macularius (Linnaeus 1766) (Spotted Sandpiper) | 0 | 2 | 0 |
| Aculeata | 4 | 0 | 0 |
| Aculifera | 0 | 2 | 0 |
| Acytota | 0 | 2 | 0 |
| Ada | 0 | 1 | 0 |
| Adansonia (Baobab) | 0 | 2 | 0 |
