Phylum [Mollusca] Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Order Veneroida H. & A. Adams, 1856 see Order Venerida Gray, 1854 Superfamily Cardiacea Lamarck, 1809 see Superfamily Cardioidea Lamarck, 1809 Family Cardiidae Lamarck, 1809 - cockles Subfamily Trachycardiinae Stewart, 1930 1 Genus Trachycardium Mörch, 1853