Genus Halistrepta W. H. Dall, 1904 ?

(3-2-3-1-3-7-0-10-0-0-0-0-0)
Ref. Amer. Fish. Soc., 1988 p 48
Bernard, 1983 p 64
Vaught, 1989 p 140
Vokes, 1980 p 209
[see also as Subgenus under Genus Periploma]

myrae (M. E. Rogers, 1962)
(3-2-3-1-3-7-0-10-0-1-0-0-0)
Syn. Periploma (Halistrepta) myrae M. E. Rogers, 1962
Ref. Bernard, 1983 p 64

sulcata (W. H. Dall, 1904)
(3-2-3-1-3-7-0-10-0-2-0-0-0)
Sulcate Spoonclam
Ref. Amer. Fish. Soc., 1988 p 48
Syn. Periploma (Periploma) sulcata W. H. Dall, 1904
Ref. Bernard, 1983 p 64