| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acanthonchus Cobb 1920 | 1 | 0 | 0 |
| Acanthonchus (Seuratiella) gracilis (Ditlevsen 1918) Wieser 1955 | 0 | 0 | 1 |
| Acarnidae Dendy 1922 | 1 | 0 | 0 |
| Acarospora | 1 | 0 | 0 |
| Acarospora fuscata | 0 | 0 | 1 |
| Acarosporaceae | 1 | 0 | 0 |
| Acarosporales | 1 | 0 | 0 |
| Acartia Dana 1846 | 4 | 0 | 0 |
| Acartia (Acanthacartia) bifilosa (Giesbrecht 1881) | 0 | 0 | 1 |
| Acartia (Acartiura) clausi Giesbrecht 1889 | 0 | 0 | 2 |
| Acartia (Acartiura) clausi Giesbrecht 1889 | 0 | 0 | 2 |
| Acartia (Acartiura) longiremis (Lilljeborg 1853) | 0 | 0 | 1 |
| Acartia (Acanthacartia) tonsa Dana 1849 | 0 | 0 | 1 |
| Acartiidae Sars G. O. 1903 | 1 | 0 | 0 |
| Acaulidae Fraser 1924 | 1 | 0 | 0 |
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