Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Lucinida Gray, 1854 Superfamily Thyasiroidea Dall, 1900 (1895) [monotypic] Family Thyasiridae Dall, 1900 (1895)