Subgenus (Acrosterigma) W. H. Dall, 1900

(3-5-4-0-4-2-6-14-1-0-0-0-0)
Ref. Abbott, 1974 p 483
Keen, 1971 p 153
[see also as Genus]

dalli (A. Heilprin, 1887) [f][T]
(3-5-4-0-4-2-6-14-1-1-0-0-0)
Syn. Cardium (Cardium) dalli A. Heilprin, 1887
Ref. Abbott, 1974 p 483

magnum (C. v Linne, 1758)
(3-5-4-0-4-2-6-14-1-2-0-0-0)
Magnum Cockle, Magnum Pricklycockle
Ref. Amer. Fish. Soc., 1988 p 39
Syn. Cardium (Cardium) marmoreum J. B. P. A. de Lamarck, 1819
Ref. Abbott, 1974 p 483 bw
Syn. Trachycardium (Trachycardium) marmoreum J. B. P. A. de Lamarck, 1819
Ref. Abbott & Dance, 1982 p 327 c

pristipleura (W. H. Dall, 1901)
(3-5-4-0-4-2-6-14-1-3-0-0-0)
Syn. Cardium (Cardium) hornelli J. R. Tomlin, 1928;
Cardium (Cardium) maculatum G. B. Sowerby, 1840 [not J. F. Gmelin, 1791];
Cardium (Cardium) maculosum G. B. Sowerby, 1833 [not W. Wood, 1815]
Ref. Keen, 1971 p 153 bw