1. Subfamily Darininae Signorelli, 2011
   1. Genus Darina J. E. Gray, 1853
2. Subfamily Lutrariinae Gray, 1853
   1. Genus Eastonia J. E. Gray, 1853
   2. Genus Heterocardia Deshayes, 1855
   3. Genus Lutraria Lamarck, 1799
   4. Genus Meropesta Iredale, 1929
   5. Genus Standella J. E. Gray, 1853
   6. Genus Tresus J. E. Gray, 1853
   7. Genus Zenatia J. E. Gray, 1853
   8. Genus Zenatina E. D. Gill & Darragh, 1963
3. Subfamily Mactrinae Lamarck, 1809
   1. Genus Austromactra Iredale, 1930
   2. Genus Barymactra Cossmann, 1909
   3. Genus Coelomactra Dall, 1895
   4. Genus Crassula Marwick, 1948
   5. Genus Cyclomactra Dall, 1895
   6. Genus Diaphoromactra Iredale, 1930
   7. Genus Harvella J. E. Gray, 1853
   8. Genus Huberimactra Cosel & Gofas, 2018
   9. Genus Leptospisula Dall, 1895
   10. Genus Mactra Linnaeus, 1767
   11. Genus Mactrella J. E. Gray, 1853
   12. Genus Mactrellona J. G. Marks, 1951
   13. Genus Mactrinula J. E. Gray, 1853
   14. Genus Mactromeris Conrad, 1868
   15. Genus Maorimactra H. J. Finlay, 1928
   16. Genus Mulinia J. E. Gray, 1837
   17. Genus Oxyperas Mörch, 1853
   18. Genus Rangia Des Moulins, 1832
   19. Genus Scalpomactra H. J. Finlay, 1928
   20. Genus Scissodesma Gray, 1837
   21. Genus Simomactra Dall, 1894
   22. Genus Spisula J. E. Gray, 1837
   23. Genus Trinitasia Maury, 1928
   24. Genus Tumbeziconcha Pilsbry & Olsson, 1935
   25. Genus Mactrotoma Dall, 1894 accepted as Standella J. E. Gray, 1853 (unaccepted > junior objective synonym)
   26. Genus Spissula [sic] accepted as Spisula J. E. Gray, 1837 (unaccepted > misspelling - incorrect subsequent spelling)
4. Genus Mactrona Marwick, 1952
5. Genus Petromactra Saul, 1973
6. Subfamily Resaniinae Marwick, 1931
   1. Genus Resania J. E. Gray, 1853
7. Subfamily Tanysiphoninae Scarlato & Starobogatov, 1971
   1. Genus Tanysiphon W. H. Benson, 1858
8. Genus Coleomactra [sic] accepted as Coelomactra Dall, 1895 (misspelling)
9. Genus Colorimactra Iredale, 1929 accepted as Mactra Linnaeus, 1767 (unaccepted > junior subjective synonym)
10. Genus Cryptodon Conrad, 1837 accepted as Tresus J. E. Gray, 1853 (invalid: junior homonym of Cryptodon Turton, 1822; Schizothaerus is a replacement name)
11. Genus Deikea Mayer[-Eymar], 1872 accepted as Mactra Linnaeus, 1767 (unaccepted > junior subjective synonym)
12. Genus Electomactra Iredale, 1930 accepted as Standella J. E. Gray, 1853 (unaccepted > junior subjective synonym)
13. Genus Gnathodon G. B. Sowerby I, 1832 accepted as Rangia Des Moulins, 1832 (unaccepted > junior objective synonym)
14. Genus Hemimactra Swainson, 1840 accepted as Spisula (Hemimactra) Swainson, 1840 represented as Spisula J. E. Gray, 1837 (unaccepted > superseded rank)
15. Genus Laminaria Mayer[-Eymar], 1867 accepted as Resania J. E. Gray, 1853 (unaccepted > junior subjective synonym)
16. Genus Longimactra H. J. Finlay, 1928 accepted as Oxyperas Mörch, 1853 (unaccepted > junior subjective synonym)
17. Genus Mactrula Marwick, 1948 accepted as Pseudocardium Gabb, 1866 † (unaccepted > junior subjective synonym)
18. Genus Micromactra Dall, 1894 accepted as Standella J. E. Gray, 1853 (unaccepted > junior subjective synonym)
19. Genus Myomactra Mayer[-Eymar], 1867 accepted as Resania J. E. Gray, 1853 (unaccepted > junior subjective synonym)
20. Genus Nannomactra Iredale, 1930 accepted as Mactra (Nannomactra) Iredale, 1930 represented as Mactra Linnaeus, 1767 (unaccepted > superseded rank)
21. Genus Notospisula Iredale, 1930 accepted as Spisula J. E. Gray, 1837 (unaccepted > junior subjective synonym)
22. Genus Psammophila T. Brown, 1827 accepted as Lutraria (Psammophila) T. Brown, 1827 represented as Lutraria Lamarck, 1799 (unaccepted > superseded rank)
23. Genus Pseudoxyperas Sacco, 1901 accepted as Oxyperas Mörch, 1853 (synonym)
24. Genus Rangianella Conrad, 1868 accepted as Rangia (Rangianella) Conrad, 1868 represented as Rangia Des Moulins, 1832
25. Genus Spisulina P. Fischer, 1887 accepted as Spisula J. E. Gray, 1837 (unaccepted > unjustified emendation, An unnecessary substitute name for "Spisula H. & A. Adams, 1856, non Gray, 1837")
26. Genus Standella Gray, 1853 sensu H. Adams & A. Adams, 1856 accepted as Leptospisula Dall, 1895 (misapplication)
27. Genus Symmorphomactra Dall, 1894 accepted as Simomactra Dall, 1894 (unaccepted > junior subjective synonym)
28. Genus Telemactra Iredale, 1929 accepted as Mactra Linnaeus, 1767 (unaccepted > junior subjective synonym)
29. Genus Trigonella da Costa, 1778 accepted as Mactra Linnaeus, 1767 (unaccepted > junior objective synonym)
30. Genus Vanganella J. E. Gray, 1853 accepted as Resania J. E. Gray, 1853 (unaccepted > junior subjective synonym)
31. Subfamily Zenatiinae Dall, 1895 accepted as Lutrariinae Gray, 1853 (unaccepted > junior subjective synonym)
32. Genus Zenatraria Beu, 1966 accepted as Lutraria (Psammophila) T. Brown, 1827 represented as Lutraria Lamarck, 1799 (unaccepted > junior subjective synonym)

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