| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Amphithalamus albus Rolán, 1991 |
Western Central Atlantic | 0.11 | |
| Amphithalamus fulcira (Laceron, 1956) |
Eastern Central Pacific | ||
| Amphithalamus glabrus Simone, 1996 |
Western Atlantic | 0.12 | |
| Amphithalamus inclusus Carpenter, 1864 |
Southeast Pacific | ||
| Amphithalamus niger Rolán, 1991 |
Western Central Atlantic | 0.105 | |
| Amphithalamus rauli Rolán, 1991 |
Western Central Atlantic | 0.084 | |
| Amphithalamus sundayensis Oliver, 1915 |
Southwest Pacific | ||
| Amphithalamus vallei Aguayo & Jaume, 1947 |
Del Valle's tiny shell | Western Atlantic | 0.125 |