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 Arcticoidea Newton, 1891 (1844) [monotypic] 1 Family Arcticidae Newton, 1891 (1844) [monotypic]