Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Venerida Gray, 1854 Superfamily Sphaerioidea Deshayes, 1855 (1820) Family Sphaeriidae Deshayes, 1855 (1820) - freshwater fingernail clams Subfamily Sphaeriinae Deshayes, 1855 (1820)