Subgenus (Periploma) C. F. Schumacher, 1816[1817]

(3-2-3-1-3-7-0-13-6-0-0-0-0)
Ref. Bernard, 1979 p 59
Bernard, 1983 p 64
Keen, 1971 p 292

affine A. E. Verrill & K. J. Bush, 1898
(3-2-3-1-3-7-0-13-6-1-0-0-0)
Related Spoonclam
Ref. Abbott, 1974 p 561
Amer. Fish. Soc., 1988 p 48

alaskanum M. W. Williams, 1940
(3-2-3-1-3-7-0-13-6-2-0-0-0)
Ref. Abbott, 1974 p 561
[=Periploma (Periploma) aleuticum (A. Krause, 1885)]
Ref. Bernard, 1983 p 64

aleutica [aleuticum] (A. Krause, 1885)
(3-2-3-1-3-7-0-13-6-3-0-0-0)
Aleutian Spoonclam
Ref. Amer. Fish. Soc., 1988 p 48
Syn. Anatina ? aleutica A. Krause, 1885;
Periploma alaskana M. W. Williams, 1940
Bernard, 1979 p 59
Syn. Anatina aleutica A. Krause, 1885;
Periploma (Periploma) alaskanun M. W. Williams, 1940;
Periploma (Periploma) fragilis authors, not J. G. Totten, 1835;
Periploma (Periploma) simplex authors, not A. d'Orbigny, 1845
Ref. Bernard, 1983 p 64 ?

angasi H. Crosse & P. Fischer, 1864
(3-2-3-1-3-7-0-13-6-4-0-0-0)
Angas's Spoon Clam
Size 3"
Ref. Abbott & Dance, 1982 p 374 c

anguliferum (R. A. Philippi, 1847)
(3-2-3-1-3-7-0-13-6-5-0-0-0)
Angled Spoonclam
Ref. Abbott, 1974 p 561
Amer. Fish. Soc., 1988 p 48

argentarium [argentaria] (T. A. Conrad, 1837)
(3-2-3-1-3-7-0-13-6-6-0-0-0)
[=Periploma (Periploma) planiusculum (G. B. Sowerby, 1834)]
Ref. Abbott, 1974 p 561
Keen, 1971 p 293

carpenteri W. H. Dall, 1896
(3-2-3-1-3-7-0-13-6-7-0-0-0)
Size 2" long Ref. Bernard, 1983 p 64
Keen, 1971 p 292 bw d

discus R. E. C. Stearns, 1890[1891]+
(3-2-3-1-3-7-0-13-6-8-0-0-0)
Round Spoon Clam, Round Spoon Shell, Round Spoonclam
Size 1"-1.5" long
Ref. Abbott, 1974 p 561 d
Abbott & Dance, 1982 p 373 c
Amer. Fish. Soc., 1988 p 48
Bernard, 1983 p 64
Keen, 1971 p 292 d
Morris, 1966 p 49 bw

excurva [excurvum] P. P. Carpenter, 1856
(3-2-3-1-3-7-0-13-6-9-0-0-0)
[=Periploma (Periploma) planiusculum G. B. Sowerby, 1834)]
Ref. Abbott, 1974 p 561
Bernard, 1983 p 64
Keen, 1971 p 293

fragilis authors [not J. G. Totten, 1835]
(3-2-3-1-3-7-0-13-10-0-0-0-0)
[=Periploma (Periploma) aleuticum (A. Krause, 1885)]
Ref. Bernard, 1983 p 64

fragile [fragilis] (J. G. Totten, 1835)
(3-2-3-1-3-7-0-13-6-11-0-0-0)
Fragile Spoon Clam, Fragile Spoon Shell, Fragile Spoonclam
Ref. Abbott, 1974 p 560 d
Amer. Fish. Soc., 1988 p 48
Morris, 1973 p 101 bw
Syn. Anatina fragilis J. G. Totten, 1835
Ref. Wagner, 1984 p 75 bw

inaequivalvis C. F. Schumacher, 1817 [T]
(3-2-3-1-3-7-0-13-6-12-0-0-0)
Ref. Bernard, 1979 p 59
[=Periploma (Periploma) margaritaceum (J. B. P. A. de Lamarck, 1801)]
Ref. Abbott, 1974 p 560

inequale C. B. Adams, 1842
(3-2-3-1-3-7-0-13-6-13-0-0-0)
Unequal Spoon Shell
Ref. Morris, 1973 p 101 bw
[=Periploma (Periploma) margaritaceum (J. B. P. A. de Lamarck, 1801)]
Ref. Abbott, 1974 p 560
Abbott & Dance, 1982 p 373

lagartilla A. A. Olsson, 1961
(3-2-3-1-3-7-0-13-6-14-0-0-0)
Size 1" long
Ref. Keen, 1971 p 293 bw

lenticulare (G. B. Sowerby, 1834)
(3-2-3-1-3-7-0-13-6-15-0-0-0)
[=Periploma planiusculum (G. B. Sowerby, 1834)]
Ref. Abbott, 1974 p 561
Syn. Anatina alta C. B. Adams, 1852;
Periploma excurva P. P. Carpenter, 1856
Ref. Bernard, 1983 p 64
Keen , 1971 p 293 bw d

margaritaceum (J. B. P. A. de Lamarck, 1801) [T]
(3-2-3-1-3-7-0-13-6-16-0-0-0)
Unequal Spoon Clam, Unequal Spoonclam
Size 0.75"-1" long
Syn. Periploma (Periploma) inaequivalvis C. F. Schumacher, 1817;
Periploma (Periploma) inequale C. B. Adams, 1842
Ref. Abbott, 1974 p 560 bw
Syn. Periploma (Periploma) inequale C. B. Adams, 1842
Ref. Abbott & Dance, 1982 p 373 c

obtusum [obtusa] (S. C. T. Hanley, 1842)
(3-2-3-1-3-7-0-13-6-17-0-0-0)
[=Periploma (Periploma) planiusculum (G. B. Sowerby, 1834)]
Ref. Abbott, 1974 p 561
Keen, 1971 p 293

papyracea P. P. Carpenter, 1856
(3-2-3-1-3-7-0-13-6-18-0-0-0)
[=Periploma (Periploma) plalniusculum G. B. Sowerby, 1834]
Ref. Keep, 1971 p 293

papyratium [papyraceum, papyratium] (T. Say, 1822)
(3-2-3-1-3-7-0-13-6-19-0-0-0)
Paper Spoon Clam, Paper Spoon Shell, Paper Spoonclam
Size 0.5"-1" long
Ref. Abbott, 1974 p 560 bw
Amer. Fish. Soc., 1988 p 48
Morris, 1973 p 101 bw

planiusculum [planuisculum] (G. B. Sowerby, 1834)
(3-2-3-1-3-7-0-13-6-20-0-0-0)
Common Western Spoon Clam, Flat Spoonclam, Western Spoon Clam, Western Spoon Shell
Size 1"-3" long
Ref. Abbott & Dance, 1982 p 373 c
Amer. Fish. Soc., 1988 p 48
Morris, 1966 p 50 bw
Syn. Periploma (Periploma) argentarium (T. A. Conrad, 1837);
Periploma (Periploma) excurvum (P. P. Carpenter, 1855;
Periploma (Periploma) lenticulare (G. B. Sowerby, 1834);
Periploma (Periploma) obtusum (S. C. T. Hanley, 1842)
Ref. Abbott, 1974 p 561 bw
Syn. Periploma (Periploma) argentaria T. A. Conrad, 1837;
Periploma (Periploma) obtusa S. C. T. Hanley, 1842;
Periploma (Periploma) papyracea P. P. Carpenter, 1856
Ref. Bernard, 1983 p 64
Keen, 1971 p 293 d

simplex authors [not A. d'Orbigny, 1845]
(3-2-3-1-3-7-0-13-6-21-0-0-0)
[=Periploma (Periploma) aleuticum (A. Krause, 1885)]
Ref. Bernard, 1983 p 64

stearnsii W. H. Dall, 1896
(3-2-3-1-3-7-0-13-6-22-0-0-0)
Size 2" long
Ref. Abbott, 1974 p 561
Bernard, 1983 p 64
Keen, 1971 p 293 bw d

sulcatum W. H. Dall, 1904 [T]
(3-2-3-1-3-7-0-13-6-23-0-0-0)
[=Halistrepta sulcata (W. H. Dall, 1904)]
Ref. Bernard, 1983 p 64

teevani L. G. Hertlein & A. M. Strong, 1946
(3-2-3-1-3-7-0-13-6-24-0-0-0)
Size 1" long
Ref. Bernard, 1983 p 64
Keen, 1971 p 293 d

tenerum P. Fischer, 1882
(3-2-3-1-3-7-0-13-6-25-0-0-0)
Delicate Spoonclam
Ref. Abbott, 1974 p 561
Amer. Fish. Soc., 1988 p 48

undulatum (undulata) A. E. Verrill, 1885
(3-2-3-1-3-7-0-13-6-26-0-0-0)
Wavy Spoon Shell
Size 0.5" long
Ref. Abbott, 1974 p 561 d
Morris, 1973 p 102 bw