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 Tellinoidea Blainville, 1814 Family Semelidae Stoliczka, 1870 (1825) - semelids Genus Theora Adams & Adams, 1856 Subgenus Endopleura Adams, 1864