Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Heterodonta Neumayr, 1884
         Order Venerida Gray, 1854
           Superfamily Arcticoidea Newton, 1891 (1844)
             1 Family Arcticidae Newton, 1891 (1844)
             2 Family †Euloxidae Gardner, 1943
             3 Family †Isocyprinidae Gardner, 2005
             4 Family †Pollicidae Stephenson, 1953
             5 Family Trapezidae Lamy, 1920 (1895), orth. cons.
             6 Family †Veniellidae Dall, 1895