| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Penitella conradi Valenciennes, 1846 |
Abalone piddock | Northeast Pacific | 3.3 |
| Penitella fitchi Turner, 1955 |
Fitch piddock | East Pacific | |
| Penitella hopkinsi Kennedy & Armentrout, 1989 |
Chimney piddock | East Pacific | |
| Penitella kamakurensis (Yokoyama, 1922) |
Rock clam | Northwest Pacific | |
| Penitella penita (Conrad, 1837) |
Flap-tip piddock | Eastern Pacific | 7.2 |
| Penitella richardsoni Kennedy, 1989 |
Monterey piddock | Eastern Pacific | |
| Penitella turnerae Evans & Fisher, 1966 |
Turner piddock | East Pacific |