1. Family Isocyprinidae R. N. Gardner, 2005 †
2. Family Neoleptonidae Thiele, 1934
3. Family Veneridae Rafinesque, 1815
4. Family Bernardinidae Keen, 1969 accepted as Neoleptonidae Thiele, 1934 (unaccepted > junior subjective synonym)
5. Family Callocardiidae Dall, 1895 accepted as Callocardiinae Dall, 1895 (unaccepted > superseded rank)
6. Family Chionidae Frizzell, 1936 accepted as Chioninae Frizzell, 1936 accepted as Venerinae Rafinesque, 1815 (unaccepted > superseded rank)
7. Family Clementiidae Frizzell, 1936 accepted as Clementiinae Frizzell, 1936 (unaccepted > superseded rank)
8. Family Cooperellidae Dall, 1900 accepted as Petricolinae A. d'Orbigny, 1840
9. Family Dosiniidae Deshayes, 1853 † accepted as Dosiniinae Deshayes, 1853 (unaccepted > superseded rank)
10. Family Gafrariidae Korobkov, 1954 accepted as Gouldiinae R. B. Stewart, 1930 (unaccepted > junior subjective synonym)
11. Family Meretricidae J. E. Gray, 1847 accepted as Meretricinae Gray, 1847 (unaccepted > superseded rank)
12. Family Mysiidae J. E. Gray, 1854 accepted as Petricolinae A. d'Orbigny, 1840 (unaccepted > junior subjective synonym)
13. Family Oncophoridae Davitashvili, 1934 † accepted as Tapetinae J. E. Gray, 1851 (invalid: type genus a junior homonym of Oncophora Diesing, 1851 [Nematoda])
14. Family Petricolidae A. d'Orbigny, 1840 accepted as Petricolinae A. d'Orbigny, 1840 (unaccepted > superseded rank)
15. Family Rzehakiidae Korobkov, 1954 † accepted as Tapetinae J. E. Gray, 1851
16. Family Sunettidae Stoliczka, 1870 accepted as Sunettinae Stoliczka, 1870 (unaccepted > superseded rank)
17. Family Turtoniidae W. Clark, 1855 accepted as Turtoniinae W. Clark, 1855 (unaccepted > superseded rank)

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