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 Cardioidea Lamarck, 1809
Family Cardiidae Lamarck, 1809 - cockles
Subfamily Protocardiinae Reuss, 1846
Genus Nemocardium Meek, 1876
Subgenus Keenaea Habe, 1951