Subgenus (Petrasma) W. H. Dall, 1908

(3-3-2-0-3-3-0-8-2-0-0-0-0)
Ref. Bernard, 1983 p 9
Keen, 1971 p 24
Lindner, 1977 p 99
Vaught, 1989 p 113
[see also as Genus]

antarctica R. A. Philippi, 1887 [f]
(3-3-2-0-3-3-0-8-2-1-0-0-0)
[miocene]
Ref. Bernard, 1983 p 9

panamensis W. H. Dall, 1908
(3-3-2-0-3-3-0-8-2-2-0-0-0)
Size 1.5" long
Ref. Bernard, 1983 p 9
Keen, 1971 p 24 bw

valvulus P. P. Carpenter, 1864
(3-3-2-0-3-3-0-8-2-3-0-0-0)
Pacific Awningclam
Size 0.75" long
Ref. Amer. Fish. Soc., 1988 p 22
Keen, 1971 p 24 bw
Syn. Solemya (Solemya) occidentalis authors [not G. P. Deshayes, 1857];
Solemya (Solemya) velum authors [not T. Say, 1877]
Ref. Bernard, 1983 p 9