Subgenus (Polymesoda) C. S. Rafinesque, 1820[1828]

(3-4-4-0-9-1-0-58-8-0-0-0-0)
Ref. Bernard, 1983 p 50
Keen, 1971 p 112

acuta (T. Prime, 1861)
(3-4-4-0-9-1-0-58-8-1-0-0-0)
Syn. Cyrena (Cyrena) acuta T. Prime, 1861
Ref. Bernard, 1983 p 50

alabamensis S. Clessin, 1869
(3-4-4-0-9-1-0-58-8-2-0-0-0)
[=Polymesoda (Polymesoda) caroliniana (L. A. G. Bosc, 1801)]
Ref. Abbott, 1974 p 521

caroliniana (L. A. G. Bosc, 1801) [T]
(3-4-4-0-9-1-0-58-8-3-0-0-0)
Carolina Marsh Clam, Carolina Marshclam
Ref. Abbott & Dance, 1982 p 352 c
Amer. Fish. Soc., 1988 p 44
Syn. Polymesoda (Polymesoda) alabamensis S. Clessin, 1869
Ref. Abbott, 1974 p 521 bw

convexa (G. P. Deshayes, 1855)
(3-4-4-0-9-1-0-58-8-4-0-0-0)
Syn. Corbicula convexa G. P. Deshayes, 1855
Ref. Bernard, 1983 p 50

floridana T. A. Conrad, 1846
(3-4-4-0-9-1-0-58-8-5-0-0-0)
[=Polymesoda (Pseudocyrena) maritima (A. d'Orbigny, 1842)]
Ref. Abbott, 1974 p 521
Abbott & Dance, 1982 p 352

joseana J. P. E. Morrison, 1946
(3-4-4-0-9-1-0-58-8-6-0-0-0)
[=Polymesoda (Egeta) inflata (R. A. Philippi, 1851)]
Ref. Bernard, 1983 p 50
Keen, 1971 p 112

mexicana (W. J. Broderip & G. B. Sowerby, 1829)
(3-4-4-0-9-1-0-58-8-7-0-0-0)
Syn. Polymesoda fragilis (G. B. Sowerby, 1878);
Polymesoda nitidula (G. P. Deshayes, 1855)
Ref. Abbott, 1974 p 521
Syn. Cyrena (Cyrena) bullata authors [not G. B. Sowerby in L. A. Reeve, 1878];
Cyrena (Cyrena) floridana authors [not T. A. Conrad, 1846];
Cyrena (Cyrena) fragilis G. B. Sowerby in L. A. Reeve, 1878;
Cyrena (Cyrena) insignis G. P. Deshayes, 1855;
Cyrena (Cyrena) mexicana W. J. Broderip & G. B. Sowerby, 1829;
Cyrena (Cyrena) nitidula G. P. Deshayes, 1855
Ref. Bernard, 1983 p 50
Syn. Cyrena (Cyrena) fragilis ex G. P. Deshayes, ms, G. B. Sowerby, 1878;
Cyrena (Cyrena) nitidula G. P. Deshayes, 1855
Ref. Keen, 1971 p 112 bw

notabilis (G. P. Deshayes, 1855)
(3-4-4-0-9-1-0-58-8-8-0-0-0)
Syn. Cyrena (Cyrena) notabilis G. P. Deshayes, 1855;
Cyrena (Cyrena) pullastra O. A. L. Morch, 1861;
Polymesoda (Polymesoda) zeteki H. A. Pilsbry, 1931
Ref. Bernard, 1983 p 50
Syn. Polymesoda (Polymesoda) pullastra O. A. L. Morch, 1861;
Polymesoda (Polymesoda) zeteki H. A. Pilsbry, 1931
Ref. Keen, 1971 p 112 bw

? placans (S. C. T. Hanley, 1845)
(3-4-4-0-9-1-0-58-8-9-0-0-0)
Agreeable Marsh Clam
Ref. Abbott & Dance, 1982 p 352 c

protexta T. A. Conrad, 1869
(3-4-4-0-9-1-0-58-8-10-0-0-0)
[=Polymesoda (Pseudocyrena) maritima (A. d'Orbigny, 1842)]
Ref. Abbott, 1974 p 521

pullastra O. A. L. Morch, 1861
(3-4-4-0-9-1-0-58-8-11-0-0-0)
[=Polymesoda (Polymesoda) notabilis (G. P. Deshayes, 1855)]
Ref. Keen, 1971 p 112

zeteki H. A. Pilsbry, 1931
(3-4-4-0-9-1-0-58-8-12-0-0-0)
[=Polymesoda (Polymesoda) notabilis (G. P. Deshayes, 1855)]
Ref. Bernard, 1983 p 50 Keen, 1971 p 112