1. Subfamily Brachidontinae F. Nordsieck, 1969
   1. Genus Brachidontes Swainson, 1840
   2. Genus Geukensia Van de Poel, 1959
   3. Genus Ischadium Jukes-Browne, 1905
   4. Genus Mytilaster Monterosato, 1883
   5. Genus Brachiodontes accepted as Brachidontes Swainson, 1840 (unaccepted > misspelling - incorrect subsequent spelling)
   6. Genus Brachydontes [sic] accepted as Brachidontes Swainson, 1840 (unaccepted > misspelling - incorrect original spelling, misspelling by J. E. Gray, 1847)
   7. Genus Brachyodon Jukes-Browne, 1905 accepted as Brachidontes Swainson, 1840 (unaccepted > unavailable name)
   8. Genus Brachyodontes Herrmannsen, 1846 accepted as Brachidontes Swainson, 1840 (unaccepted > unjustified emendation)
   9. Genus Hormomya Mörch, 1853 accepted as Brachidontes Swainson, 1840 (synonym)
   10. Genus Mytilodonta Coen, 1935 accepted as Mytilaster Monterosato, 1883
   11. Genus Scolimytilus Olsson, 1961 accepted as Brachidontes Swainson, 1840 (unaccepted > junior subjective synonym)
2. Subfamily Crenellinae J. E. Gray, 1840
   1. Genus Arcuatula Jousseaume, 1919
   2. Genus Arvella Scarlato, 1960
   3. Genus Choromytilus T. Soot-Ryen, 1952
   4. Genus Crenella T. Brown, 1827
   5. Genus Exosiperna Iredale, 1929
   6. Genus Musculus Röding, 1798
   7. Genus Mytella T. Soot-Ryen, 1955
   8. Genus Parabrachidontes K. S. Tan, S. H. M. Tan, Sanpanich, Duangdee & Ambarwati, 2024
   9. Genus Perna Philipsson, 1788
   10. Genus Rhomboidella Monterosato, 1884
   11. Genus Solamen Iredale, 1924
   12. Genus Vilasina Scarlato, 1960
   13. Genus Hippagus I. Lea, 1833 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   14. Genus Lamya T. Soot-Ryen, 1958 accepted as Arcuatula Jousseaume, 1919 (synonym)
   15. Genus Lanistes Swainson, 1840 accepted as Musculus Röding, 1798 (synonym)
   16. Genus Lanistina J. E. Gray, 1847 accepted as Musculus Röding, 1798 (unaccepted > junior subjective synonym)
   17. Genus Megacrenella T. Habe & Ki. Ito, 1965 accepted as Solamen Iredale, 1924 (unaccepted > junior subjective synonym)
   18. Genus Modiolaria Lovén, 1846 accepted as Musculus Röding, 1798 (unaccepted > junior subjective synonym)
   19. Genus Musculista G. Yamamoto & T. Habe, 1958 accepted as Arcuatula Jousseaume, 1919 (unaccepted > junior subjective synonym)
   20. Genus Myoparo I. Lea, 1833 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   21. Genus Nuculocardia A. d'Orbigny, 1853 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   22. Genus Ryenella C. A. Fleming, 1959 accepted as Musculus (Modiolarca) J. E. Gray, 1842 represented as Musculus Röding, 1798
3. Subfamily Dacrydiinae Ockelmann, 1983
   1. Genus Dacrydium Torell, 1859
   2. Genus Dacridium [sic] accepted as Dacrydium Torell, 1859 (unaccepted > misspelling - incorrect subsequent spelling)
   3. Genus Quendreda Soot-Ryen, 1955 accepted as Dacrydium (Quendreda) T. Soot-Ryen, 1955 accepted as Dacrydium Torell, 1859 (unaccepted > junior subjective synonym)
4. Subfamily Lithophaginae H. Adams & A. Adams, 1857
   1. Genus Lithophaga Röding, 1798
   2. Genus Lithodomus Cuvier, 1816 accepted as Lithophaga Röding, 1798 (unaccepted > junior subjective synonym)
   3. Genus Lithophagus [sic] accepted as Lithophaga Röding, 1798 (incorrect subsequent spelling)
   4. Genus Lythodomus accepted as Lithophaga Röding, 1798 (unaccepted > misspelling - incorrect subsequent spelling, of Lithodomus Cuvier, 1816)
5. Subfamily Mytilinae Rafinesque, 1815
   1. Genus Adula H. Adams & A. Adams, 1857
   2. Genus Crenomytilus T. Soot-Ryen, 1955
   3. Genus Dentimodiolus Iredale, 1939
   4. Genus Gregariella Monterosato, 1883
   5. Genus Mytilus Linnaeus, 1758
   6. Genus Trichomya Ihering, 1900
   7. Genus Botulina Dall, 1889 accepted as Gregariella Monterosato, 1883 (synonym)
   8. Genus Byssogerdius K.-S. Tan, S. H-N. Tan, Sanpanich, Duangdee & Ambarwati, 2021 accepted as Dentimodiolus Iredale, 1939 (unaccepted > junior subjective synonym)
   9. Genus Eumytilus Ihering, 1900 accepted as Mytilus Linnaeus, 1758 (junior objective synonym of Mytilus)
   10. Genus Mitylus accepted as Mytilus Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling, incorrect subsequent spelling)
   11. Genus Modiolarca J. E. Gray, 1842 accepted as Musculus (Modiolarca) J. E. Gray, 1842 represented as Musculus Röding, 1798 (unaccepted > superseded rank)
   12. Genus Mytulus [sic] accepted as Mytilus Linnaeus, 1758 (incorrect subsequent spelling)
   13. Genus Pacifimytilus Kafanov, 1984 accepted as Mytilus Linnaeus, 1758 (synonym)
   14. Genus Propetilus Iredale, 1937 accepted as Gregariella Monterosato, 1883 (synonym)
   15. Genus Tibialectus Iredale, 1939 accepted as Gregariella Monterosato, 1883 (synonym)
   16. Genus Trichomusculus Iredale, 1924 accepted as Gregariella Monterosato, 1883 (unaccepted > junior subjective synonym)
6. Subfamily Mytiliseptinae B. Morton, 2020
   1. Genus Austromytilus Laseron, 1956
   2. Genus Mytilisepta T. Habe, 1951
   3. Genus Perumytilus Olsson, 1961
   4. Genus Semimytilus T. Soot-Ryen, 1955
7. Subfamily Septiferinae Scarlato & Starobogatov, 1979
   1. Genus Septifer Récluz, 1848
8. Subfamily Adulinae Scarlato & Starobogatov, 1979 accepted as Mytilinae Rafinesque, 1815 (unaccepted > junior subjective synonym)
9. Subfamily Arcuatulinae Scarlato & Starobogatov, 1979 accepted as Crenellinae J. E. Gray, 1840 (unaccepted > junior subjective synonym)
10. Subfamily Lithodominae Gray, 1854 accepted as Lithophaginae H. Adams & A. Adams, 1857
11. Subfamily Musculinae Iredale, 1939 accepted as Mytilinae Rafinesque, 1815 (unaccepted > junior subjective synonym)
12. Subfamily Mytiliseptiferinae accepted as Mytiliseptinae B. Morton, 2020 (incorrectly formed name)
13. Subfamily Perninae Scarlato & Starobogatov, 1979 accepted as Mytilinae Rafinesque, 1815
14. Subfamily Mytilidae incertae sedis (temporary name)
    1. Genus Amygdalum Megerle von Mühlfeld, 1811
    2. Genus Aulacomya Mörch, 1853
    3. Genus Urumella Hayami & Kase, 1993
    4. Genus Modiella Monterosato, 1884 accepted as Amygdalum Megerle von Mühlfeld, 1811 (synonym)

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