original description(ofUnio cylindricoides 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 athttp://digitallibrary.amnh.org/handle/2246/650 page(s): 626, pl. 38, figs 1-7, pl. 39, figs 1-3 [details]
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