Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 1 Family †Amnigeniidae Khalfin, 1948 2 Family †Lipanellidae Sánchez, 2005 3 Family †Palaeomutelidae Lahusen, 1897 4 Clade Palaeoheterodonta Newell, 1965 5 Clade Heterodonta Neumayr, 1884