Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Pholadomyida Newell, 1965 Superfamily Clavagelloidea d'Orbigny, 1844 Family Clavagellidae d'Orbigny, 1844, nom. protect.