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 Dreissenoidea Gray, 1840 [monotypic] Family Dreissenidae Gray, 1840 Genus Mytilopsis Conrad, 1857