Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Venerida Gray, 1854 Superfamily Mactroidea Lamarck, 1809 Family Mactridae Lamarck, 1809 - surf clams Subfamily Lutrariinae Gray, 1853