Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Palaeoheterodonta Newell, 1965
         Order Trigoniida Dall, 1889
           Superfamily Trigonioidea Lamarck, 1819
             Family †Schizodidae Newell & Boyd, 1975
               1 Subfamily †Schizodinae Newell & Boyd, 1975
               2 Subfamily †Eoastartinae Newell & Boyd, 1975