MolluscaBase name details
original description
(of Unio pyramidellus Whitfield, 1907 †) Whitfield, R.P. (1907). Remarks on and descriptions of new fossil Unionidae from the Laramie clays of Montana. <em>Bulletin of the American Museum of Natural History.</em> 23(26): 623-628., available online at http://digitallibrary.amnh.org/handle/2246/650
page(s): 625, pl. 40, figs 3-4 [details]
basis of record
Russell, L.S. (1976). Pelecypods of the Hell Creek Formation (Uppermost Cretaceous) of Garfield County, Montana. <em>Canadian Journal of Earth Sciences.</em> 13: 365-388.
page(s): 384-386, pl. 6, figs 9-12 [details] Available for editors [request]