| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Aegina Eschscholtz 1829 | 0 | 0 | 1 |
| Aeginura Haeckel 1879 | 0 | 0 | 1 |
| Aegisthus Giesbrecht 1891 | 0 | 0 | 1 |
| Aequorea Péron & Lesueur 1810 | 0 | 0 | 1 |
| Aetidiopsis | 0 | 0 | 1 |
| Agalma Eschscholtz 1825 | 0 | 0 | 1 |
| Aglaophamus | 0 | 0 | 1 |
| Alciopina Claparède & Panceri 1867 | 0 | 0 | 0 |
| Alecton | 0 | 0 | 1 |
| Alexandrium Halim 1960 | 0 | 0 | 1 |
| Alteromonas | 0 | 0 | 1 |
| Amphicaryon Chun 1888 | 0 | 0 | 1 |
| Amphipholis Ljungman 1866 | 0 | 0 | 1 |
| Amphiura | 0 | 0 | 1 |
| Amydetes | 0 | 0 | 1 |
