Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884 Order Chamida see Order Venerida Gray, 1854 Superfamily Veneroidea Rafinesque, 1815 Family Veneridae Rafinesque, 1815 - venus clams Subfamily Tapetinae Gray, 1851 Genus Macridiscus Dall, 1902