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 Gryphaeidae Vialov, 1936
               Subfamily Pycnodonteinae Stenzel, 1959
                 Tribe Hyotissini Scarlato & Starobogatov, 1979
                   1 Genus Hyotissa Stenzel, 1971
                   2 Genus Parahyotissa Harry, 1985