| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acrochaetium virgatulum | 0 | 0 | 1 |
| Acrocirridae | 1 | 0 | 0 |
| Acrocnida Gislén 1926 | 1 | 0 | 0 |
| Acrocnida brachiata (Montagu 1804) | 0 | 0 | 1 |
| Acroperus | 1 | 0 | 0 |
| Acroperus harpae (Baird 1834) (common duck waterflea) | 0 | 0 | 1 |
| Acrosiphonia J. Agardh 1846 | 2 | 0 | 0 |
| Acrosiphonia arcta | 0 | 0 | 1 |
| Acrosiphonia lanosa | 0 | 0 | 1 |
| Acrosiphoniaceae | 2 | 0 | 0 |
| Acrosorium Zanardini ex Kützing 1869 | 1 | 0 | 0 |
| Acrosorium venulosum | 0 | 0 | 1 |
| Acteon Montfort 1810 | 1 | 0 | 0 |
| Acteon tornatilis (Linnaeus 1758) (European acteon) | 0 | 0 | 1 |
| Acteonidae d'Orbigny 1842 | 1 | 0 | 0 |
