Subgenus (Cyclocardia) T. A. Conrad, 1867

(3-4-4-0-5-1-7-6-1-0-0-0-0)
[see also as Genus under Subfamily: CARDITAMERINAE]

alaskana W. H. Dall, 1903
(3-4-4-0-5-1-7-6-1-1-0-0-0)
[=Cyclocardia (Cyclocardia) crebricostata (A. Krause, 1885)]
Ref. Bernard, 1983 p 34
Bernard, 1984 p 40
[see also as Genus under Subfamily: CARDITAMERINAE]

borealis T. A. Conrad, 1831
(3-4-4-0-5-1-7-6-1-2-0-0-0)

ovata Rjabinina, 1952 [not Cardita ovata C. B. Adams, 1845]
(3-4-4-0-5-1-7-6-1-2-1-0-0)
[=Cyclocardia (Cyclocardia) ovata (Rjabinina, 1952)]
Ref. Bernard, 1983 p 34
[see also as Genus under Subfamily: CARDITAMERINAE]

crebricostata (A. Krause) in T. Kotaka, 1962
(3-4-4-0-5-1-7-6-1-3-0-0-0)
[=Cyclocardia (Cyclocardia) crebricostata (A. Krause, 1885)]
Ref. Bernard, 1984 p 40
[see also as Genus under Subfamily: CARDITAMERINAE]

gouldii W. H. Dall, 1903
(3-4-4-0-5-1-7-6-1-4-0-0-0)
[=Cyclocardia (Cyclocardia) gouldii (W. H. Dall, 1903)]
Ref. Bernard, 1983 p 34
[see also as Genus under Subfamily: CARDITAMERINAE]

incisa W. H. Dall, 1903
(3-4-4-0-5-1-7-6-1-5-0-0-0)
[=Cyclocardia (Cyclocardia) incisa (W. H. Dall, 1903)]
Ref. Bernard, 1983 p 34
[see also as Genus under Subfamily: CARDITAMERINAE]

morsei W. H. Dall, 1918
(3-4-4-0-5-1-7-6-1-6-0-0-0)
[=Crassicardia crassidens (W. J. Broderip & G. B. Sowerby, 1829)]
Ref. Bernard, 1983 p 34

rudis ex G. B. Sowerby, ms, W. H. Dall, 1903
(3-4-4-0-5-1-7-6-1-7-0-0-0)
[=Crassicardia crassidens (W. J. Broderip & G. B. Sowerby, 1829)]
Ref. Bernard, 1983 p 34

stearnsii W. H. Dall, 1903
(3-4-4-0-5-1-7-6-1-8-0-0-0)
[=Cyclocardia (Cyclocardia) ventricosa (A. A. Gould, 1850)]
Ref. Bernard, 1983 p 34
[see also as Genus under Subfamily: CARDITAMERINAE]