| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acremonium alcalophilum G. Okada 1993 | 0 | 1 | 0 |
| Acritarchs | 0 | 1 | 0 |
| Acrobotrys | 0 | 1 | 0 |
| Acronema sippewissettensis Teal, T. Guillemette, M. Chapman & Margulis 1998 | 0 | 1 | 0 |
| Acropisthiidae | 0 | 1 | 0 |
| Acropisthium Perty 1852 | 0 | 1 | 0 |
| Acropisthium mutabile Perty 1852 | 0 | 1 | 0 |
| Acrosphaera Haeckel 1881 | 0 | 1 | 0 |
| Actinichona | 0 | 1 | 0 |
| Actinichonidae | 0 | 1 | 0 |
| Actiniscaceae | 0 | 1 | 0 |
| Actiniscus Ehrenberg 1843 | 0 | 1 | 0 |
| Actinobacteria | 0 | 1 | 0 |
| Actinobolina Strand 1928 | 0 | 1 | 0 |
| Actinobolinidae | 0 | 1 | 0 |
