Subgenus (Americardia) R. B. Stewart, 1930

(3-5-4-0-4-2-3-25-1-0-0-0-0)
Ref. Keen, 1971 p 157
Lindner, 1977 p 110
Vaught, 1989 p 129

biangulata (W. J. Broderip & G. B. Sowerby, 1829)
(3-5-4-0-4-2-3-25-1-1-0-0-0)
Syn. Cardium (Cardium) magnificum P. P. Carpenter, 1857
Ref. Keen, 1971 p 157 bw

guanacastensis (L. G. Hertlein & A. M. Strong, 1947)
(3-5-4-0-4-2-3-25-1-2-0-0-0)
Syn. Cardium (Cardium) magnificum of authors [not ex G. P. Deshayes, ms, P. P. Carpenter, 1857];
Cardium (Cardium) planicostatum G. B. Sowerby, 1833 [not Sedgwick & Murchison, 1829]
Ref. Keen, 1971 p 157 bw

media (C. v Linne, 1758)
(3-5-4-0-4-2-3-25-1-3-0-0-0)
Atlantic Strawberry Cockle
Ref. Keen, 1971 p 157
Lindner, 1977 pl 60 c