Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
       Order Ostreida Férussac, 1822
         Suborder Ostreina Férussac, 1822 see Order Ostreida Férussac, 1822
           Superfamily Ostreoidea Rafinesque, 1815
             Family Ostreidae Rafinesque, 1815 - true oysters
               Subfamily Ostreinae Rafinesque, 1815
                 Tribe Ostreini Rafinesque, 1815
                   Genus Ostrea Linnaeus, 1758 - flat oyster
                     1 Subgenus Turkostrea Vialov, 1936
                     2 Subgenus Bellostrea Vialov, 1936