| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acanthoplegma Schewiakoff 1926 | 0 | 1 | 0 |
| Acanthoplegmatidae | 0 | 1 | 0 |
| Acanthosporidium | 0 | 1 | 0 |
| Acanthosporinae | 0 | 1 | 0 |
| Acanthostomella Jörgensen 1927 | 0 | 1 | 0 |
| Acarogregarina | 0 | 1 | 0 |
| Acaryophrya André 1915 | 0 | 1 | 0 |
| Acervulinacea Schultze 1854 | 0 | 1 | 0 |
| Acervulinidae | 0 | 1 | 0 |
| Acetohalobium | 0 | 1 | 0 |
| Acetohalobium arabaticum Zhilina & Zavarzin 1990 | 0 | 1 | 0 |
| Lophomonadidae | 0 | 14 | 0 |
| Achromatium | 0 | 1 | 0 |
| Achromatium oxaliferium | 0 | 1 | 0 |
| Achromatium oxaliferum Schewiakoff 1893 | 0 | 1 | 0 |
