Phylum Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
     Class Bivalvia Linnaeus, 1758 - bivalves
       1 "Protobranchia" Pelseneer, 1889 see Subclass Protobranchia Pelseneer, 1889
       2 Pteriomorpha Beurlen, 1944 see Order Pteriomorpha Beurlen, 1944
       3 Palaeoheterodonta Newell, 1965
       4 Heterodonta Neumayr, 1884