Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order †Hippuritida Newell, 1965 Superfamily †Radiolitoidea d'Orbigny, 1847 Family †Monopleuridae Munier-Chalmas, 1873