Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Pteriomorphia Beurlen, 1944
       Order Ostreida Férussac, 1822 [monotypic]
         Superfamily Ostreoidea Rafinesque, 1815
           Family Gryphaeidae Vialov, 1936
             1 Subfamily †Gryphaeinae Vialov, 1936
             2 Subfamily †Exogyrinae Vialov, 1936
             3 Subfamily †Gryphaeostreinae Stenzel, 1971
             4 Subfamily Pycnodonteinae Stenzel, 1959