Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Protobranchia Pelseneer, 1889
     1 Family †Afghanodesmatidae Scarlato & Starobogatov, 1979
     2 Family †Antactinodiontidae Guo, 1980
     3 Family †Ctenodontidae Wöhrmann, 1893, nom. illeg.
     4 Family †Eritropidae Cope, 2000
     5 Family †Pseudocyrtodontidae Maillieux, 1939
     6 Family †Tironuculidae Babin, 1982
     7 Order Nuculida Dall, 1889 [monotypic]
     8 Order Solemyida Dall, 1889
     9 Order Nuculanida Carter, Campbell & Campbell, 2000 [monotypic]