Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Pteriomorphia Beurlen, 1944 Order †Cyrtodontida Scarlato & Starobogatov, 1971 Superfamily †Falcatodontoidea Cope, 1996 [monotypic] Family †Falcatodontidae Cope, 1996