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 [sic] 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 (unaccepted > junior subjective synonym)
   10. Genus Mytilodonta Coen, 1935 accepted as Mytilaster Monterosato, 1883 (unaccepted > junior subjective synonym)
   11. Genus Scolimytilus Olsson, 1961 accepted as Brachidontes Swainson, 1840 (unaccepted > junior subjective synonym)
2. Subfamily Crenellinae J. E. Gray, 1840
   1. Genus Arcoperna Conrad, 1865 †
   2. Genus Arcuatula Jousseaume, 1919
   3. Genus Arvella Scarlato, 1960
   4. Genus Choromytilus T. Soot-Ryen, 1952
   5. Genus Crenella T. Brown, 1827
   6. Genus Exosiperna Iredale, 1929
   7. Genus Musculus Röding, 1798
   8. Genus Mytella T. Soot-Ryen, 1955
   9. Genus Parabrachidontes K. S. Tan, S. H. M. Tan, Sanpanich, Duangdee & Ambarwati, 2024
   10. Genus Perna Philipsson, 1788
   11. Genus Rhomboidella Monterosato, 1884
   12. Genus Semimodiola Cossmann, 1887 †
   13. Genus Solamen Iredale, 1924
   14. Genus Vilasina Scarlato, 1960
   15. Genus Hippagus I. Lea, 1833 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   16. Genus Lamya T. Soot-Ryen, 1958 accepted as Arcuatula Jousseaume, 1919 (unaccepted > junior subjective synonym)
   17. Genus Lanistes Swainson, 1840 accepted as Musculus Röding, 1798 (unaccepted > junior homonym, invalid: junior homonym of Lanistes Montfort, 1810 [Gastropoda])
   18. Genus Lanistina J. E. Gray, 1847 accepted as Musculus Röding, 1798 (unaccepted > junior objective synonym)
   19. Genus Lanistria J. E. Gray, 1847 accepted as Lanistina J. E. Gray, 1847 accepted as Musculus Röding, 1798 (unaccepted > misspelling - incorrect subsequent spelling)
   20. Genus Megacrenella T. Habe & Ki. Ito, 1965 accepted as Solamen Iredale, 1924 (unaccepted > junior subjective synonym)
   21. Genus Modiolaria Lovén, 1846 accepted as Musculus Röding, 1798 (unaccepted > junior objective synonym)
   22. Genus Musculista G. Yamamoto & T. Habe, 1958 accepted as Arcuatula Jousseaume, 1919 (unaccepted > junior subjective synonym)
   23. Genus Myoparo I. Lea, 1833 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   24. Genus Nuculocardia A. d'Orbigny, 1853 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   25. Genus Ryenella C. A. Fleming, 1959 accepted as Musculus (Modiolarca) J. E. Gray, 1842 represented as Musculus Röding, 1798 (unaccepted > junior subjective synonym)
   26. Genus Stalagmium Conrad, 1833 † accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
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 objective synonym)
   3. Genus Lithophagus [sic] accepted as Lithophaga Röding, 1798 (incorrect subsequent spelling)
   4. Genus Lythodomus [sic] accepted as Lithophaga Röding, 1798 (unaccepted > misspelling - incorrect subsequent spelling)
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 Praemytilus F. W. Anderson & L. R. Cox, 1948 †
   7. Genus Trichomya Ihering, 1900
   8. Genus Botulina Dall, 1889 accepted as Gregariella Monterosato, 1883 (unaccepted > junior subjective synonym)
   9. Genus Byssogerdius K.-S. Tan, S. H-N. Tan, Sanpanich, Duangdee & Ambarwati, 2021 accepted as Dentimodiolus Iredale, 1939 (unaccepted > junior objective synonym)
   10. Genus Eumytilus Ihering, 1900 accepted as Mytilus Linnaeus, 1758 (unaccepted > junior objective synonym)
   11. Genus Mitylus [sic] accepted as Mytilus Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling)
   12. Genus Modiolarca J. E. Gray, 1842 accepted as Musculus (Modiolarca) J. E. Gray, 1842 represented as Musculus Röding, 1798 (unaccepted > superseded rank)
   13. Genus Mytelus [sic] accepted as Mytilus Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling)
   14. Genus Mytilites [sic] † accepted as Mytulites Schlotheim, 1813 † accepted as Mytilus Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling)
   15. Genus Mytiloconcha Conrad, 1862 † accepted as Mytilus (Mytiloconcha) Conrad, 1862 † represented as Mytilus Linnaeus, 1758 (unaccepted > superseded rank)
   16. Genus Mytulites Schlotheim, 1813 † accepted as Mytilus Linnaeus, 1758 (unaccepted > unavailable name, ICZN Art. 20 discarding names formed with suffix "-ites" to denote fossils)
   17. Genus Mytulus [sic] accepted as Mytilus Linnaeus, 1758 (incorrect subsequent spelling)
   18. Genus Pacifimytilus Kafanov, 1984 accepted as Mytilus Linnaeus, 1758 (unaccepted > junior subjective synonym)
   19. Genus Plicatomytilus R. C. Allison & Addicott, 1976 † accepted as Mytilus (Plicatomytilus) R. C. Allison & Addicott, 1976 † represented as Mytilus Linnaeus, 1758 (unaccepted > superseded rank)
   20. Genus Propetilus Iredale, 1937 accepted as Gregariella Monterosato, 1883 (unaccepted > junior subjective synonym)
   21. Genus Tibialectus Iredale, 1939 accepted as Gregariella Monterosato, 1883 (unaccepted > junior subjective synonym)
   22. 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 Xenomytilinae Squires & Saul, 2006 †
   1. Genus Lycettia L. R. Cox, 1937 †
   2. Genus Xenomytilus Squires & Saul, 2006 †
9. Genus Mytilops J. Hall, 1883 † (uncertain > unassessed)
10. Subfamily Adulinae Scarlato & Starobogatov, 1979 accepted as Mytilinae Rafinesque, 1815 (unaccepted > junior subjective synonym)
11. Subfamily Arcuatulinae Scarlato & Starobogatov, 1979 accepted as Crenellinae J. E. Gray, 1840 (unaccepted > junior subjective synonym)
12. Subfamily Lithodominae J. E. Gray, 1854 accepted as Lithophaginae H. Adams & A. Adams, 1857 (unaccepted > junior subjective synonym)
13. Subfamily Musculinae Iredale, 1939 accepted as Mytilinae Rafinesque, 1815 (unaccepted > junior subjective synonym)
14. Subfamily Mytiliseptiferinae accepted as Mytiliseptinae B. Morton, 2020 (incorrectly formed name)
15. Subfamily Perninae Scarlato & Starobogatov, 1979 accepted as Mytilinae Rafinesque, 1815
16. Subfamily Mytilidae incertae sedis (temporary name)
    1. Genus Admytilus Berezovsky, 2015 †
    2. Genus Amygdalum Megerle von Mühlfeld, 1811
    3. Genus Arcomytilus Agassiz, 1842 †
    4. Genus Assytilus Berezovsky, 2015 †
    5. Genus Aulacomya Mörch, 1853
    6. Genus Eyrena Ludbrook, 1966 †
    7. Genus Falcimytilus L. R. Cox, 1937 †
    8. Genus Inoperna Conrad, 1873 †
    9. Genus Lecompteus Van de Poel, 1959 †
    10. Genus Limnolycettia C. M. Kolesnikov, 1980 †
    11. Genus Mauricia G. D. Harris, 1919 †
    12. Genus Mysidioptera Salomon, 1895 †
    13. Genus Paramusculus Kadolsky, 1989 †
    14. Genus Porubites Řehoř, 1966 †
    15. Genus Promytilus Newell, 1942 †
    16. Genus Regulifer Fürsich & Werner, 1988 †
    17. Genus Rhynchomytilus Rollier, 1914 †
    18. Genus Samiolus Kiel & Taviani, 2017 †
    19. Genus Urumella Hayami & Kase, 1993
    20. Genus Volsellina Newell, 1942 †
    21. Genus Cuneolus Stephenson, 1941 † accepted as Lycettia L. R. Cox, 1937 † (unaccepted > junior subjective synonym)
    22. Genus Modiella Monterosato, 1884 accepted as Amygdalum Megerle von Mühlfeld, 1811 (unaccepted > junior subjective synonym)
    23. Genus Mytilosootus Stilwell & Zinsmeister, 1992 † accepted as Modiomytilus M. Griffin, 1990 † (unaccepted > junior subjective synonym)
    24. Genus Retites Řehoř, 1965 † accepted as Porubites Řehoř, 1966 † (unaccepted > junior homonym, junior homonym of Retites McCaleb, 1964 [Cephalopoda]; Porubites is a replacement name)

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