Subgenus (Cunearca) W. H. Dall, 1898

(3-7-3-0-1-1-1-2-5-0-0-0-0)
Ref. Abbott, 1974 p 424
Bernard, 1983 p 15
Keen, 1971 p 44
Syn. (Imparilarca) T. Iredale, 1929;
(Potiarca) T. Iredale, 1939
Ref. Vaught, 1989 p 115
[see also as Genus]

aequatorialis (A. Orbigny, 1846)
(3-7-3-0-1-1-1-2-5-1-0-0-0)
Syn. Arca (Arca) aequatorialis A. Orbigny, 1846;
Arca (Arca) ovata L. A. Reeve, 1844, not J. F. Gmelin, 1791;
Arca (Arca) subelongata P. -H. Nyst, 1848
Ref. Bernard, 1983 p 15
Syn. Arca (Arca) ovata L. A. Reeve, 1844, not J. F. Gmelin, 1791;
Arca (Arca) subelongata P. -H. Nyst, 1848
Ref. Keen, 1971 p 44 bw

bifrons (P. P. Carpenter, 1857)
(3-7-3-0-1-1-1-2-5-2-0-0-0)
Syn. Arca (Arca) bifrons P. P. Carpenter, 1857;
Arca (Arca) brasiliana authors, not J. B. P. A. de Lamarck, 1859;
Arca (Arca) cardiiformis G. B. Sowerby, 1833, not M. B. de Basterot, 1825;
Arca (Arca) inaequivalvis G. B. Sowerby, 1832, not J. G. Bruguiere, 1790;
Arca (Scapharca) corculum O. A. L. Morch, 1861
Ref. Bernard, 1983 p 15
Syn. Arca (Arca) cardiiformis G. B. Sowerby, 1833, not M. B. de Basterot, 1825;
Arca (Arca) corculum O. A. L. Morch, 1861;
Arca (Arca) cordata G. P. Deshayes, 1857, not Benett, 1831
Ref. Keen, 1971 p 44 bw

brasiliana (J. B. P. A. de Lamarck, 1819) [T]
(3-7-3-0-1-1-1-2-5-3-0-0-0)
Incongruous Ark
Ref. Amer. Fish. Soc., 1988 p 24
Syn. Anadara (Anadara) incongrua T. Say, 1822
Ref. Abbott, 1974 p 424 bw
Abbott & Dance, 1982 p 293 c

chemnitzii (R. A. Philippi, 1851)
(3-7-3-0-1-1-1-2-5-4-0-0-0)
Chemnitz Ark, Chemnitz's Ark
Ref. Abbott, 1974 p 424 bw
Amer. Fish. Soc., 1988 p 24

esmeralda (H. A. Pilsbry & A. A. Olsson, 1941)
(3-7-3-0-1-1-1-2-5-5-0-0-0)
Ref. Keen, 1971 p 46 bw
Syn. Arca (Cunearca) esmeralda H. A. Pilsbry & A. A. Olsson, 1941
Ref. Bernard, 1983 p 15

nux (G. B. Sowerby, 1833)
(3-7-3-0-1-1-1-2-5-6-0-0-0)
Ref. Abbott, 1974 p 424
Keen, 1971 p 46 bw
Syn. Arca (Arca) nux G. B. Sowerby, 1833;
Arca (Arca) patheonensis E. M. Spieker, 1922;
Arca (Arca) zorritensis E. M. Spieker, 1922
Ref. Bernard, 1983 p 15

perlabiata (U. S. Grant & H. R. Gale, 1931)
(3-7-3-0-1-1-1-2-5-7-0-0-0)
Syn. Arca (Arca) labiata G. B. Sowerby, 1833, not D. C. Solander, 1786;
Arca (Arca) perlabiata U. S. Grant & H. R. Gale, 1931
Ref. Bernard, 1983 p 15
Syn. Arca (Arca) labiata G. B. Sowerby, 1833, not J. Lightfoot, 1786
Ref. Keen, 1971 p 46 bw

reinharti (H. N. Lowe, 1935)
(3-7-3-0-1-1-1-2-5-8-0-0-0)
Syn. Arca (Anadara) reinharti H. N. Lowe, 1935
Ref. Bernard, 1983 p 15