| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Hancockia burni Thompson, 1972 |
Burn's hancockia | Indo-West Pacific | 1 |
| Hancockia californica MacFarland, 1923 |
Hancock's nudibranch | Eastern Pacific | 1.5 |
| Hancockia ryrca Marcus, 1957 |
Western Atlantic | 1.5 | |
| Hancockia schoeferti Schrödl, 1999 |
Seaweed flame sea slug | Southeast Pacific | |
| Hancockia uncinata (Hesse, 1872) |
Northeast Atlantic and the Mediterranean Sea |