Subgenus (Acar) J. E. Gray, 1857

(3-7-3-0-1-1-2-14-1-0-0-0-0)
Ref. Abbott, 1974 p 422
Bernard, 1983 p 14
Keen, 1971 p 38
Syn. (Vitracar) T. Iredale, 1939
Ref. Vaught, 1989 p 115
[see also as Genus]

bailyi (P. Bartsch, 1931)
(3-7-3-0-1-1-2-14-1-1-0-0-0)
Baily Miniature Ark, Baily's Miniature Ark
Ref. Abbott, 1974 p 422 bw
Amer. Fish. Soc., 1988 p 24
Keen, 1971 p 40 d
Syn. Acar bailyi P. Bartsch, 1931;
Arca (Arca) gradata authors, not W. J. Broderip & G. B. Sowerby, 1829;
Arca (Arca) pernoides authors, not P. P. Carpenter, 1856
Ref. Bernard, 1983 p 14

divaricata (G. B. Sowerby, 1833)
(3-7-3-0-1-1-2-14-1-2-0-0-0)
Syn. Acar hawaiensis W. H. Dall, P. Bartsch & H. A. Rehder, 1938;
Acar laysana W. H. Dall, P. Bartsch & H. A. Rehder, 1938;
Byssoarca divaricata G. B. Sowerby, 1833
Ref. Bernard, 1983 p 15

domingensis (J. B. P. A. de Lamarck, 1819)
(3-7-3-0-1-1-2-14-1-3-0-0-0)
White Miniature Ark
Ref. Amer. Fish. Soc., 1988 p 24
Syn. Arca (Arca) reticulata J. F. Gmelin, 1791
Ref. Abbott, 1974 p 422 bw

gradata (W. J. Broderip & G. B. Sowerby, 1829) [T]
(3-7-3-0-1-1-2-14-1-4-0-0-0)
Ref. Lindner, 1977 pl 52 c
Syn. Barbatia (Barbatia) panamensis P. Bartsch, 1931;
Barbatia (Barbatia) pholadiformis C. B. Adams, 1852;
Barbatia (Barbatia) rostae S. S. Berry, 1954
Ref. Abbott, 1974 p 422 bw
Syn. Arca (Arca) gradata W. J. Broderip & G. B. Sowerby, 1829;
Arca (Arca) panamensis P. Bartsch, 1931;
Arca (Arca) plicata authors, not J. H. Chemnitz, 1795;
Arca (Arca) reticulata authors, not J. F. Gmelin, 1791;
Byssoarca divaricata authors, not G. B. Sowerby, 1833
Ref. Bernard, 1983 p 15
Syn. Arca (Arca) panamensis P. Bartsch, 1931
Ref. Keen, 1971 p 40 bw

pusilla (G. B. Sowerby, 1833)
(3-7-3-0-1-1-2-14-1-5-0-0-0)
Syn. Arca (Arca) gradata authors, not W. J. Broderip & G. B. Sowerby, 1829;
Byssoarca pusilla G. B. Sowerby, 1833, not Arca pusilla P.-H. Nyst, 1835
Ref. Bernard, 1983 p 15

rostae S. S. Berry, 1954
(3-7-3-0-1-1-2-14-1-6-0-0-0)
Syn. Arca (Byssoarca) pholadiformis C. B. Adams, 1852, not A. Orbigny, 1844
Ref. Bernard, 1983 p 15
Keen, 1971 p 40 bw