1. Subfamily Exogyrinae Vialov, 1936 †
   1. Genus Aetostreon Bayle, 1878 †
   2. Genus Ceratostreon Bayle, 1878 †
   3. Genus Exogyra Say, 1820 †
   4. Tribe Gryphaeostreini Stenzel, 1971 †
      1. Genus Gryphaeostrea Conrad, 1865 †
   5. Genus Ilymatogyra Stenzel, 1971 †
   6. Genus Nanogyra Beurlen, 1958 †
   7. Genus Planospirites Lamarck, 1801 †
   8. Genus Rhynchostreon Bayle, 1878 †
2. Subfamily Gryphaeinae Vialov, 1936 †
   1. Genus Catinula Rollier, 1911 †
   2. Tribe Gryphaeini Vialov, 1936 †
      1. Genus Gryphaea Lamarck, 1801 †
      2. Genus Gryphites Schlotheim, 1813 † accepted as Gryphaea Lamarck, 1801 † (unaccepted > unavailable name, ICZN Art. 20 discarding names formed with suffix "-ites" to denote fossils)
      3. Genus Liogryphaea P. Fischer, 1886 † accepted as Gryphaea Lamarck, 1801 † (rejected ICZN opin. 338)
   3. Tribe Pernostreini Kosenko, 2017 †
      1. Genus Deltoideum Rollier, 1917 †
      2. Genus Pernostrea Munier-Chalmas, 1864 †
3. Subfamily Pycnodonteinae Stenzel, 1959
   1. Genus Argutostrea Kosenko, 2016 †
   2. Genus Crenostrea Marwick, 1931 †
   3. Genus Empressostrea M. Huber & Lorenz, 2007
   4. Genus Hyotissa Stenzel, 1971
   5. Genus Neopycnodonte Stenzel, 1971
   6. Genus Pycnodonte Fischer von Waldheim, 1835
   7. Genus Pycnogryphaea Kosenko, 2018 †
   8. Genus Notostrea H. J. Finlay, 1928 † accepted as Pycnodonte (Notostrea) H. J. Finlay, 1928 † represented as Pycnodonte Fischer von Waldheim, 1835 (unaccepted > superseded rank)
   9. Genus Parahyotissa Harry, 1985 accepted as Hyotissa Stenzel, 1971
   10. Genus Phrygraea Vyalov, 1936 † accepted as Pycnodonte (Phygraea) Vyalov, 1936 † represented as Pycnodonte Fischer von Waldheim, 1835 (unaccepted > superseded rank)
   11. Genus Pycnodonta accepted as Pycnodonte Fischer von Waldheim, 1835 (unaccepted > misspelling - incorrect subsequent spelling)
4. Genus Gigantostrea Sacco, 1897 † accepted as Pycnodonte Fischer von Waldheim, 1835 (unaccepted > junior subjective synonym)

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