White, C.A. (1877). Paleontological Papers No. 1. - Descriptions of Unionidae and Physidsae collected by Prof. E. D. Cope, from the Judith River Group of Montana Territory during the summer of 1876 <em>Bulletin of the United States Geological and Geographical Survey of the Territories</em>. 3: 599-602, available online at https://www.biodiversitylibrary.org/page/31646305
page(s): 600-601 [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): 80-81 [details] Available for editors [request]
From editor or global species database
Type locality "Judith River group; Dog Creek, a tributary of the Upper Missouri River, Montana Territory", USA; Judith River Fm., Campanian, Late Cretaceous [details]