Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Venerida Gray, 1854 Superfamily Tellinoidea Blainville, 1814 Family Donacidae Fleming, 1828 - wedge shells