Subgenus (Spisula) J. E. Gray, 1837

(3-4-4-0-21-3-2-92-8-0-0-0-0)
Ref. Abbott, 1974 p 489
Bernard, 1983 p 40

adamsi A. A. Olsson, 1961
(3-4-4-0-21-3-2-92-8-1-0-0-0)
Ref. Bernard, 1983 p 40
Keen, 1971 p 209 bw

aequilateralis (G. P. Deshayes, 1854)
(3-4-4-0-21-3-2-92-8-2-0-0-0)
Equal-sized Mactra, Triangular Trough Shell
Ref. Abbott & Dance, 1982 p 336 c
Penniket, 1970 p 100 c

camaronis W. H. Dall, 1921
(3-4-4-0-21-3-2-92-8-3-0-0-0)
[=Spisula (Spisula) hemphillii (W. H. Dall, 1894)]
Ref. Bernard, 1983 p 40

catilliformis T. A. Conrad, 1867
(3-4-4-0-21-3-2-92-8-4-0-0-0)
Catilliform Mactra, Catilliform Surf Clam, Dish Surfclam
Ref. Abbott, 1974 p 489 d
Abbott & Dance, 1982 p 336 c
Amer. Fish. Soc., 1988 p 40
Syn. Mactra (Mactra) californica authors [not T. A. Conrad, 1837];
Spisula (Spisula) catilliformis alcatrazensis R. Arnold, 1907;
Spisula (Spisula) mercedensis E. L. Packard, 1916
Ref. Bernard, 1983 p 40

alcatrazensis R. Arnold, 1907
(3-4-4-0-21-3-2-92-8-4-1-0-0)
[=Spisula (Spisula) catilliformis T. A. Conrad, 1867]
Ref. Bernard, 1983 p 40

dolabriformis T. A. Conrad, 1863
(3-4-4-0-21-3-2-92-8-5-0-0-0)
[=Mactra (Simomactra) dolabriformis (T. A. Conrad, 1863)]
Ref. Bernard, 1983 p 39

elliptica (T. Brown, 1827)
(3-4-4-0-21-3-2-92-8-6-0-0-0)
Ref. Lindner, 1977 pl 62 c

hemphillii [hemphilli] (W. H. Dall, 1894)
(3-4-4-0-21-3-2-92-8-7-0-0-0)
Hemphill Surfclam, Hemphill's Mactra, Hemphill's Surf Clam
Ref. Abbott, 1974 p 490 d
Abbott & Dance, 1982 p 335 c
Amer. Fish. Soc., 1988 p 40
Syn. Mactra (Mactra) hemphillii W. H. Dall, 1894;
Spisula (Spisula) camaronis W. H. Dall, 1921;
Spisula (Spisula) strongi J. Q. Burch, 1945
Ref. Bernard, 1983 p 40

mercedensis E. L. Packard, 1916
(3-4-4-0-21-3-2-92-8-8-0-0-0)
[=Spisula (Spisula) catilliformis T. A. Conrad, 1867]
Ref. Bernard, 1983 p 40

? nivea (J. F. Gmelin, 1791)
(3-4-4-0-21-3-2-92-8-9-0-0-0)
Snowy Mactra
Ref. Abbott & Dance, 1982 p 336 c

planulata (T. A. Conrad, 1837)
(3-4-4-0-21-3-2-92-8-10-0-0-0)
Fattish Surf Clam, Flat Surfclam
Ref. Abbott, 1974 p 489 d
Amer. Fish. Soc., 1988 p 40
Syn. Mactra (Mactra) falcata authors [not A. A. Gould, 1850];
Mactra (Mactra) planulata T. A. Conrad, 1837
Ref. Bernard, 1983 p 40

polynyma (W. Stimpson, 1860)
(3-4-4-0-21-3-2-92-8-11-0-0-0)
Stimpson's Mactra
Ref. Abbott & Dance, 1982 p 335 c

alaskana W. H. Dall, 1894
(3-4-4-0-21-3-2-92-8-11-1-0-0)
[=Spisula (Mactromeris) polynyma (W. Stimpson, 1860)]
Ref. Wagner, 1984 p 66

raveneli (T. A. Conrad, 1831)
(3-4-4-0-21-3-2-92-8-12-0-0-0)
[=Spisula (Hemimactra) solidissima similis (T. Say, 1822)]
Ref. Abbott, 1974 p 489

solida (C. v Linne, 1758) [T]
(3-4-4-0-21-3-2-92-8-13-0-0-0)
Solid Mactra
Ref. Abbott, 1974 p 489
Abbott & Dance, 1982 p 336 c
Lindner, 1977 pl 62 c

strongi J. Q. Burch, 1945
(3-4-4-0-21-3-2-92-8-14-0-0-0)
[=Spisula (Spisula) hemphillii (W. H. Dall, 1894)]
Ref. Bernard, 1983 p 40

subtruncata (E. M. da Costa, 1778)
(3-4-4-0-21-3-2-92-8-15-0-0-0)
Subtruncate Mactra
Ref. Abbott & Dance, 1982 p 336 c
Lindner, 1977 pl 62 c

vladivostokensis P. Bartsch, 1929
(3-4-4-0-21-3-2-92-8-16-0-0-0)
[=Mactromeris polynyma (W. Stimpson, 1860)]
Ref. Bernard, 1983 p 40