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 Gray, 1840
   1. Genus Arcoperna Conrad, 1865 †
   2. Genus Arcuatula Jousseaume, 1919
   3. Genus Arvella Scarlato, 1960
   4. Genus Choromytilus Soot-Ryen, 1952
   5. Genus Crenella T. Brown, 1827
   6. Genus Exosiperna Iredale, 1929
   7. Genus Musculus Röding, 1798
   8. Genus Mytella 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 Soot-Ryen, 1958 accepted as Arcuatula Jousseaume, 1919 (synonym)
   17. Genus Lanistes Swainson, 1840 accepted as Musculus Röding, 1798 (synonym)
   18. Genus Lanistina J. E. Gray, 1847 accepted as Musculus Röding, 1798 (unaccepted > junior subjective synonym)
   19. Genus Megacrenella T. Habe & Ki. Ito, 1965 accepted as Solamen Iredale, 1924 (unaccepted > junior subjective synonym)
   20. Genus Modiolaria Lovén, 1846 accepted as Musculus Röding, 1798 (unaccepted > junior subjective synonym)
   21. Genus Musculista G. Yamamoto & T. Habe, 1958 accepted as Arcuatula Jousseaume, 1919 (unaccepted > junior subjective synonym)
   22. Genus Myoparo I. Lea, 1833 accepted as Crenella T. Brown, 1827 (unaccepted > junior subjective synonym)
   23. Genus Nuculocardia A. d'Orbigny, 1853 accepted as Crenella T. Brown, 1827 (synonym)
   24. Genus Ryenella C. A. Fleming, 1959 accepted as Musculus (Modiolarca) J. E. Gray, 1842 represented as Musculus Röding, 1798
   25. 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) Soot-Ryen, 1955 accepted as Dacrydium Torell, 1859 (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 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 (synonym)
   9. Genus Byssogerdius K.-S. Tan, S. H-N. Tan, Sanpanich, Duangdee & Ambarwati, 2021 accepted as Dentimodiolus Iredale, 1939 (unaccepted > junior subjective synonym)
   10. Genus Crassimytilus Scarlato & Starobogatov, 1979 accepted as Mytilus Linnaeus, 1758 (synonym)
   11. Genus Eumytilus Ihering, 1900 accepted as Mytilus Linnaeus, 1758 (junior objective synonym of Mytilus)
   12. Genus Mitylus accepted as Mytilus Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling, incorrect subsequent spelling)
   13. Genus Modiolarca J. E. Gray, 1842 accepted as Musculus (Modiolarca) J. E. Gray, 1842 represented as Musculus Röding, 1798 (unaccepted > superseded rank)
   14. Genus Mytilites [sic] † accepted as Mytulites Schlotheim, 1813 † accepted as Mytilus Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling)
   15. Genus Mytulites Schlotheim, 1813 † accepted as Mytilus Linnaeus, 1758 (unaccepted > unavailable name, ICZN Art. 20 discarding names formed with suffix "-ites" to denote fossils)
   16. Genus Mytulus [sic] accepted as Mytilus Linnaeus, 1758 (incorrect subsequent spelling)
   17. Genus Pacifimytilus Kafanov, 1984 accepted as Mytilus Linnaeus, 1758 (synonym)
   18. Genus Plicatomytilus Allison & Addicott, 1976 † accepted as Mytilus (Plicatomytilus) Allison & Addicott, 1976 † represented as Mytilus Linnaeus, 1758 (new rank)
   19. Genus Propetilus Iredale, 1937 accepted as Gregariella Monterosato, 1883 (synonym)
   20. Genus Tibialectus Iredale, 1939 accepted as Gregariella Monterosato, 1883 (synonym)
   21. 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 Habe, 1951
   3. Genus Perumytilus Olsson, 1961
   4. Genus Semimytilus 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. Subfamily Adulinae Scarlato & Starobogatov, 1979 accepted as Mytilinae Rafinesque, 1815 (unaccepted > junior subjective synonym)
10. Subfamily Arcuatulinae Scarlato & Starobogatov, 1979 accepted as Crenellinae Gray, 1840 (unaccepted > junior subjective synonym)
11. Subfamily Lithodominae Gray, 1854 accepted as Lithophaginae H. Adams & A. Adams, 1857
12. Subfamily Musculinae Iredale, 1939 accepted as Mytilinae Rafinesque, 1815 (unaccepted > junior subjective synonym)
13. Subfamily Mytiliseptiferinae accepted as Mytiliseptinae B. Morton, 2020 (incorrectly formed name)
14. Subfamily Perninae Scarlato & Starobogatov, 1979 accepted as Mytilinae Rafinesque, 1815
15. 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 Cuneolus Stephenson, 1941 †
    7. Genus Inoperna Conrad, 1873 †
    8. Genus Limnolycettia C. M. Kolesnikov, 1980 †
    9. Genus Mauricia G. D. Harris, 1919 †
    10. Genus Mysidioptera Salomon, 1895 †
    11. Genus Mytilosootus Stilwell & Zinsmeister, 1992 †
    12. Genus Paramusculus Kadolsky, 1989 †
    13. Genus Porubites Řehoř, 1966 †
    14. Genus Promytilus Newell, 1942 †
    15. Genus Regulifer Fürsich & Werner, 1988 †
    16. Genus Rhynchomytilus Rollier, 1914 †
    17. Genus Samiolus Kiel & Taviani, 2017 †
    18. Genus Urumella Hayami & Kase, 1993
    19. Genus Volsellina Newell, 1942 †
    20. Genus Modiella Monterosato, 1884 accepted as Amygdalum Megerle von Mühlfeld, 1811 (synonym)
    21. Genus Retites Řehoř, 1965 † accepted as Porubites Řehoř, 1966 † (unaccepted > junior homonym, junior homonym of Retites McCaleb, 1964 [Cephalopoda]; Porubites is a replacement name)
    22. Genus Lecompteus Van de Poel, 1959 † (uncertain > unassessed)

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