| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Protothaca crassisosta (Deshayes, 1835) |
Ribbed venus | Southwest Pacific | |
| Protothaca granulata (Gmelin, 1791) |
Beaded venus | North America | 2.4 |
| Protothaca laciniata (Carpenter, 1864) |
Rough littleneck | East Pacific | |
| Protothaca pectorina (Lamarck, 1818) |
Western Atlantic | ||
| Protothaca tenerrima (Carpenter, 1857) |
Thin-shell littleneck | East Pacific |