Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Myida Stoliczka, 1870 1 Superfamily Myoidea Lamarck, 1809 2 Superfamily Pholadoidea Lamarck, 1809