| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Achnanthidiaceae | 0 | 0 | 12 |
| Acholadidae | 0 | 0 | 12 |
| Acholeplasmataceae | 0 | 0 | 12 |
| Achramorphidae Borojevic, Boury-Esnault, Manuel & Vacelet 2002 | 0 | 0 | 12 |
| Achromadoridae | 0 | 0 | 12 |
| Aciculidae | 0 | 0 | 12 |
| Acidaminococcaceae | 0 | 0 | 12 |
| Acidilobaceae | 0 | 0 | 12 |
| Acidimicrobiaceae | 0 | 0 | 12 |
| Acidithiobacillaceae | 0 | 0 | 12 |
| Acidobacteriaceae | 0 | 0 | 12 |
| Acidopsidae Števčić 2005 | 0 | 0 | 12 |
| Acidothermaceae | 0 | 0 | 12 |
| Acinetidae | 0 | 0 | 12 |
| Acinetopsidae Jankowksi 1978 | 0 | 0 | 12 |
