Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Heteroconchia Gray, 1854 Clade Heterodonta Neumayr, 1884 Order Venerida Gray, 1854 Superfamily Cyrenoidoidea Adams & Adams, 1857 (1853) [monotypic] 1 Family Cyrenoididae Adams & Adams, 1857 (1853)