Genus Ensis C. F. Schumacher, 1817

(3-4-4-0-23-2-1-1-0-0-0-0-0)
Ref. Abbott, 1974 p 494
Abbott & Dance, 1982 p 338
Amer. Fish. Soc., 1988 p 40
Keen, 1971 p 261
Wagner, 1984 p 67
[see also under Family: CULTELLIDAE]
Ref. Vokes, 1980 p 141

californicus W. H. Dall, 1899
(3-4-4-0-23-2-1-1-0-1-0-0-0)
Ref. Abbott, 1974 p 495 d
Keen, 1971 p 261 d

directus (T. A. Conrad, 1843)
(3-4-4-0-23-2-1-1-0-2-0-0-0)
Atlantic Jackknife, Atlantic Jackknife Clam
Ref. Abbott, 1974 p 494 bw
Abbott & Dance, 1982 p 338 c
Amer. Fish. Soc., 1988 p 40
Syn. Solen (Solen) directus T. A. Conrad, 1843
Ref. Wagner, 1984 p 67 bw

ensis C. v Linne, 1758 [T]
(3-4-4-0-23-2-1-1-0-3-0-0-0)
Narrow Jackknife Clam
Ref. Abbott, 1974 p 494
Abbott & Dance, 1982 p 338 c

macha (G. I. Molina, 1782)
(3-4-4-0-23-2-1-1-0-4-0-0-0)
Macha Jackknife Clam
Ref. Abbott & Dance, 1982 p 338 c

megistus H. A. Pilsbry & T. L. McGinty, 1943
(3-4-4-0-23-2-1-1-0-5-0-0-0)
[may be same as Ensis Minor]
Ref. Abbott, 1974 p 494

minor W. H. Dall, 1900
(3-4-4-0-23-2-1-1-0-6-0-0-0)
Minor Jackknife, Minor Jackknife Clam
Ref. Abbott, 1974 p 494 bw
Amer. Fish. Soc., 1988 p 40

myrae S. S. Berry, 1953
(3-4-4-0-23-2-1-1-0-7-0-0-0)
California Jackknife, Californian Jackknife Clam
Ref. Abbott, 1974 p 494 d
Amer. Fish. Soc., 1988 p 40
Keen, 1971 p 261

siliqua (C. v Linne, 1758)
(3-4-4-0-23-2-1-1-0-8-0-0-0)
Giant Razor Clam
Ref. Abbott & Dance, 1982 p 339 c

tropicalis L. G. Hertlein & A. M. Strong, 1955
(3-4-4-0-23-2-1-1-0-9-0-0-0)
Ref. Abbott, 1974 p 495
Keen, 1971 p 261 bw