| Mactrella clisia Dall, 1915 |
| Mactrellona Marks, 1951 |
| Mactrellona clisia (Dall, 1915) |
| Mactrellona exoleta (Gray, 1837) |
| Mactrellona subalata (Mörch, 1860) |
| Mactridae Lamarck, 1809 |
| Mactrinae Lamarck, 1809 |
| Mactrinula Gray, 1853 |
| Mactrinula goniocyma (Pilsbry & Lowe, 1932) |
| Mactrotoma Dall, 1894 |
| Mactrotoma angusta (Reeve, 1854) |
| Mactrotoma californica (Conrad, 1837) |
| Mactrotoma fragilis (Gmelin, 1791) |
| Mactrotoma nasuta (Gould, 1851) |
| Mulinia Gray, 1837 |
| Mulinia cleryana (d'Orbigny, 1846) |
| Mulinia coloradoensis Dall, 1894 |
| Mulinia lateralis (Say, 1822) |
| Mulinia modesta Dall, 1894 |
| Mulinia pallida (Broderip & G. B. Sowerby I, 1829) |