| Modiolus rectus (Conrad, 1837) |
| Modiolus sagittatus Rehder, 1935 |
| Modiolus squamosus Beauperthuy, 1967 |
| Modiolus tumbezensis Pilsbry & Olsson, 1935 |
| Musculinae Iredale, 1939 |
| Musculista Yamamoto & Habe, 1958 |
| Musculista senhousia (Benson, 1842) |
| Musculus Röding, 1798 |
| Musculus (Modiolarca) Gray, 1842 |
| Musculus (Modiolarca) lateralis (Say, 1822) |
| Musculus (Ryenella) C. A. Fleming, 1959 |
| Mytella Soot-Ryen, 1955 |
| Mytella charruana (d'Orbigny, 1842) |
| Mytella guyanensis (Lamarck, 1819) |
| Mytella strigata Hanley, 1843 |
| Mytilidae Rafinesque, 1815 |
| Mytilinae Rafinesque, 1815 |
| Mytilus Linnaeus, 1758 |
| Mytilus adamsianus Dunker, 1856 |
| Mytilus aristatus Dillwyn, 1817 |