Subgenus (Trigoniocardia) [(Trigoniocardium)] W. H. Dall, 1900

(3-5-4-0-4-2-3-25-3-0-0-0-0)
Ref. Bernard, 1983 p 38
Keen, 1971 p 157

alabastrum P. P. Carpenter, 1857
(3-5-4-0-4-2-3-25-3-1-0-0-0)
[=Trigoniocardia (Trigoniocardia) granifera (W. J. Broderip & G. B. Sowerby, 1829)]
Ref. Abbott, 1974 p 485

antillarum (A. d'Orbigny, 1842)
(3-5-4-0-4-2-3-25-3-2-0-0-0)
Antillean White Cockle
Syn. Cardium (Cardium) ceramidum W. H. Dall, 1886
Ref. Abbott, 1974 p 485 bw

eudoxia W. H. Dall, 1916
(3-5-4-0-4-2-3-25-3-3-0-0-0)
[=Trachycardium (Mexicardia) panamense (G. B. Sowerby, 1833)]
Ref. Abbott, 1974 p 484
Bernard, 1983 p 38
Keen, 1971 p 155

granifera [graniferum] (W. J. Broderip & G. B. Sowerby, 1829) [T]
(3-5-4-0-4-2-3-25-3-4-0-0-0)
Syn. Cardium (Cardium) alabastrum P. P. Carpenter, 1857;
Cardium (Cardium) graniferum W. J. Broderip & G. B. Sowerby, 1829
Ref. Bernard, 1983 p 38
Syn. Cardium (Cardium) alabastrum P. P. Carpenter, 1857
Ref. Keen, 1971 p 157 bw
Syn. Cardium (Cardium) graniferum (W. J. Broderip & G. B. Sowerby, 1829);
Trigoniocardia (Trigoniocardia) alabastrum P. P. Carpenter, 1857
Ref. Abbott, 1974 p 485

ovuloides (L. A. Reeve, 1845)
(3-5-4-0-4-2-3-25-3-5-0-0-0)
Ref. Abbott, 1974 p 485

? speciosa (A. Adams & L. A. Reeve, 1850)
(3-5-4-0-4-2-3-25-3-6-0-0-0)
St. Helena Cockle
Ref. Abbott & Dance, 1982 p 329 c