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 Mactroidea Lamarck, 1809 Family Mesodesmatidae Gray, 1840 Subfamily Erviliinae Dall, 1895 Genus Coecella Gray, 1853