| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acanthamoeba pyriformis | 0 | 0 | 3 |
| Acanthamoebidae | 0 | 0 | 2 |
| Acanthocystidae | 0 | 0 | 1 |
| Acinetactis Stokes 1886 | 0 | 0 | 2 |
| Acramoeba dendroida | 0 | 0 | 1 |
| Acrasidae | 0 | 0 | 2 |
| Actinastrum Lagerheim 1882 | 0 | 0 | 1 |
| Actinocoma Penard 1903 | 0 | 0 | 1 |
| Actinocoryne Febvre-Chevalier 1980 | 0 | 0 | 1 |
| Actinolophus Schulze 1874 | 0 | 0 | 1 |
| Actinophryida | 0 | 0 | 1 |
| Aduncisulcus paluster Yubuki et al. 2016 | 0 | 0 | 2 |
| Aeropyrum pernix | 0 | 0 | 1 |
| Agitata Cavalier-Smith & Bass 2009 | 0 | 0 | 1 |
| Allantion H. Sandon 1924 | 0 | 0 | 2 |
