| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abarenicola Wells 1959 | 1 | 0 | 0 |
| Abarenicola pacifica Healy & Wells 1959 | 0 | 0 | 1 |
| Ablennes | 1 | 0 | 0 |
| Ablennes hians (Valenciennes 1846) (Anguille plate) | 0 | 0 | 1 |
| Abra Lamarck 1818 | 1 | 0 | 0 |
| Abra lunella (Gould 1861) | 0 | 0 | 2 |
| Abrina | 1 | 0 | 0 |
| Abra lunella (Gould 1861) | 0 | 0 | 2 |
| Acabaria | 1 | 0 | 0 |
| Melithaea japonica (Verrill 1865) | 0 | 0 | 3 |
| Acantharia | 1 | 0 | 0 |
| Acanthocepola | 1 | 0 | 0 |
| Acanthocepola krusensternii (Temminck & Schlegel 1845) | 0 | 0 | 1 |
| Acanthochitona Gray 1821 | 2 | 0 | 0 |
| Acanthochitona achates (Gould 1859) | 0 | 0 | 1 |
