Subgenus (Plagioctenium) W. H. Dall, 1898

(3-7-6-2-2-1-4-9-12-0-0-0-0)
[see also as Genus under Subfamily: CHLAMYDINAE]

compactus W. H. Dall, 1898
(3-7-6-2-2-1-4-9-12-1-0-0-0)
[=Argopecten circularis (G. B. Sowerby, 1835)]
Ref. Bernard, 1983 p 24
[see under Subfamily: CHLAMYDINAE]

filitextus C. C. Li, 1930
(3-7-6-2-2-1-4-9-12-2-0-0-0)
[=Argopecten circularis (G. B. Sowerby, 1835)]
Ref. Bernard, 1983 p 24
[see under Subfamily: CHLAMYDINAE]

newsomi R. Arnold, 1903
(3-7-6-2-2-1-4-9-12-3-0-0-0)
[=Argopecten circularis (G. B. Sowerby, 1835)]
Ref. Bernard, 1983 p 24
[see under Subfamily: CHLAMYDINAE]

subventricosus W. H. Dall, 1898
(3-7-6-2-2-1-4-9-12-4-0-0-0)
[=Argopecten circularis (G. B. Sowerby, 1835)]
Ref. Bernard, 1983 p 24
[see under Subfamily: CHLAMYDINAE]