Genus Unionium H. F. Link, 1807

(3-7-8-3-5-12-0-46-0-0-0-0-0)
[=Pinctada P. F. Roding, 1798]
Ref. Vaught, 1989 p 117
Syn. Unionidium J. E. Gray, 1851;
Unionum W. H. Dall, 1898
[=Pinctada P. F. Roding, 1798]
Ref. Vokes, 1980 p 38