| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acantharia | 1 | 0 | 0 |
| Acanthis Borkhausen 1797 | 1 | 0 | 0 |
| Acanthis hornemanni (Holböll 1843) | 0 | 0 | 1 |
| Acanthometridae | 1 | 0 | 0 |
| Acanthometron Haeckel 1887 | 1 | 0 | 0 |
| Acanthometron pellucida | 0 | 0 | 1 |
| Acarospora | 2 | 0 | 0 |
| Acarospora molybdina | 0 | 0 | 1 |
| Acarospora veronensis A. Massal. | 0 | 0 | 1 |
| Acarosporaceae | 1 | 0 | 0 |
| Acarosporales | 1 | 0 | 0 |
| Acartia Dana 1846 | 1 | 0 | 0 |
| Acartia (Acartiura) longiremis (Lilljeborg 1853) | 0 | 0 | 1 |
| Acartiidae Sars G. O. 1903 | 1 | 0 | 0 |
| Accipiter Brisson 1760 | 2 | 0 | 0 |
