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): 624, pl. 40, fig. 7, pl. 41, fig. 8 [details]
original descriptionWhitfield, 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): 624, pl. 40, fig. 7, pl. 41, fig. 8 [details]
basis of recordHenderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 86 [details] Available for editors [request]
Present Inaccurate Introduced: alien Containing type locality
Spelling Multiple original spellings were used in Whitfield (1907): biesopoides, biaesopoides, bidesopoides. [details] Type locality "130 miles northwest of Miles City, Montana, 180 feet above Pierre shales", USA; Laramie Fm., Maastrichtian, Late Cretaceous [details]
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