| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Abietinaria | 2 | 0 | 0 |
| Abietinaria abietina (Linnaeus 1758) (sea fir) | 0 | 0 | 1 |
| Abietinaria filicula (Ellis & Solander 1786) (fern hydroid) | 0 | 0 | 1 |
| Abietinaria fusca (Johnston 1847) | 0 | 0 | 2 |
| Abludomelita | 1 | 0 | 0 |
| Abludomelita gladiosa (Spence Bate 1862) | 0 | 0 | 1 |
| Abludomelita obtusata (Montagu 1813) | 0 | 0 | 2 |
| Abothrium | 1 | 0 | 0 |
| Abothrium gadi van Beneden 1871 | 0 | 0 | 1 |
| Abra (abra) | 6 | 0 | 0 |
| Abra alba (W. Wood 1802) (white abra) | 0 | 0 | 1 |
| Abra longicallus (Scacchi 1835) | 0 | 0 | 2 |
| Abra longicallus (Scacchi 1835) | 0 | 0 | 2 |
| Abra nitida (O. F. Müller 1776) (glossy furrow-shell) | 0 | 0 | 1 |
| Abra prismatica (Montagu 1808) (elongate abra) | 0 | 0 | 1 |
names in breadcrumbs
