Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Pteriomorphia Beurlen, 1944 Order Arcida Gray, 1854 Superfamily Arcoidea Lamarck, 1809 Family Glycymerididae Dall, 1908 (1847) - glycymerids Subfamily Glycymeridinae Dall, 1908 (1847)