original description
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): 626, pl. 38, figs 1-7, pl. 39, figs 1-3 [details]
basis of record
Watters, G.T. (2001). The Evolution of the Unionacea in North America, and Its Implications for the Worldwide Fauna. In: Bauer, G.; Wächtler, K. (eds) Ecology and Evolution of the Freshwater Mussels Unionoida. Springer, Berlin, Heidelberg, pp. 281-307
page(s): 288, 290, fig. 15.16 [details]
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313.
page(s): 87 [details] Available for editors [request]
From editor or global species database
Type locality "130 miles northwest of Miles City, Montana, 180 feet above Pierre shales", USA; Laramie Fm., Maastrichtian, Late Cretaceous [details]