1. Subfamily Darininae Signorelli, 2011
2. Subfamily Lutrariinae Gray, 1853
   1. Genus Darina Gray, 1853
   2. Genus Eastonia J. E. Gray, 1853
   3. Genus Heterocardia Deshayes, 1855
   4. Genus Lutraria Lamarck, 1799
   5. Genus Meropesta Iredale, 1929
   6. Genus Standella J. E. Gray, 1853
   7. Genus Tresus J. E. Gray, 1853
   8. Genus Zenatia J. E. Gray, 1853
   9. Genus Zenatina 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 Mactrotoma Dall, 1894
   16. Genus Maorimactra H. J. Finlay, 1928
   17. Genus Mulinia J. E. Gray, 1837
   18. Genus Oxyperas Mörch, 1853
   19. Genus Rangia Desmoulins, 1832
   20. Genus Scalpomactra H. J. Finlay, 1928
   21. Genus Scissodesma Gray, 1837
   22. Genus Simomactra Dall, 1894
   23. Genus Spisula J. E. Gray, 1837
   24. Genus Trinitasia Maury, 1928
   25. Genus Tumbeziconcha Pilsbry & Olsson, 1935
   26. Genus Spissula [sic] accepted as Spisula J. E. Gray, 1837 (unaccepted > misspelling)
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
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 Hemimactra Swainson, 1840 accepted as Spisula (Hemimactra) Swainson, 1840 represented as Spisula J. E. Gray, 1837
12. Genus Longimactra H. J. Finlay, 1928 accepted as Oxyperas Mörch, 1853 (synonym)
13. Genus Mactrula Marwick, 1948 accepted as Pseudocardium Gabb, 1866 † (synonym)
14. Genus Micromactra Dall, 1894 accepted as Mactrotoma Dall, 1894 (unaccepted > junior subjective synonym)
15. Genus Psammophila T. Brown, 1827 accepted as Lutraria (Psammophila) T. Brown, 1827 accepted as Lutraria Lamarck, 1799
16. Genus Pseudoxyperas Sacco, 1901 accepted as Oxyperas Mörch, 1853 (synonym)
17. Genus Rangianella Conrad, 1868 accepted as Rangia (Rangianella) Conrad, 1868 represented as Rangia Desmoulins, 1832
18. 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")
19. Genus Standella Gray, 1853 sensu H. Adams & A. Adams, 1856 accepted as Leptospisula Dall, 1895 (misapplication)
20. Genus Symmorphomactra Dall, 1894 accepted as Simomactra Dall, 1894 (unaccepted > junior subjective synonym)
21. Genus Telemactra Iredale, 1929 accepted as Mactra Linnaeus, 1767 (synonym)
22. Genus Trigonella da Costa, 1778 accepted as Mactra Linnaeus, 1767 (synonym)
23. Genus Vanganella J. E. Gray, 1853 accepted as Resania J. E. Gray, 1853 (unaccepted > junior subjective synonym)
24. Subfamily Zenatiinae Dall, 1895 accepted as Lutrariinae Gray, 1853

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