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 Mactridae Lamarck, 1809 - surf clams Subfamily Zenatiinae Dall, 1895 Genus Zenatina Gill & Darragh, 1963