| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acineta tuberosa | 0 | 8 | 0 |
| Acinetidae | 4 | 10 | 0 |
| Acrochaetiaceae | 1 | 9 | 0 |
| Acrochaetiales | 1 | 9 | 0 |
| Actinophryidae | 2 | 34 | 0 |
| Actinophrys sol | 0 | 26 | 0 |
| Actinopteri | 1 | 0 | 0 |
| Actinopterygii (ray-finned fishes) | 1 | 0 | 0 |
| Actinoptychus senarius | 0 | 1 | 0 |
| Actinosphaerium eichhornii | 0 | 8 | 0 |
| Actinotaenium cucurbitinum | 0 | 3 | 0 |
| Acutodesmus raciborskii | 0 | 1 | 0 |
| Allogromiida | 1 | 5 | 0 |
| Allogromiidae | 1 | 5 | 0 |
| Alveolata (alveolates) | 2 | 396 | 0 |
