Phylum Mollusca Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884 Order Venerida Gray, 1854 Superfamily Cyamioidea Sars, 1878 Family Galatheavalvidae Knudsen, 1970 Genus Galatheavalva Knudsen, 1970