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 Tridacnoidea Lamarck, 1819 see Superfamily Cardioidea Lamarck, 1809 Family Tridacnidae - giant clams see Subfamily Tridacninae Lamarck, 1819 Genus Hippopus Lamarck, 1799