Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Carditida Dall, 1889 Superfamily Crassatelloidea Férussac, 1822 Family Astartidae d'Orbigny, 1844 (1840) - astarte clams Subfamily †Opinae Chavan, 1952