original description
Meek, F. B. (1871). Preliminary paleontological report consisting of lists of fossils, with descriptions of some new types, etc. <em>United States Geological and Geographical Survey of the Territories, annual report.</em> 4: 287-318., available online at https://www.biodiversitylibrary.org/page/30326788
page(s): 303 [details]
additional source
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 [details]
From editor or global species database
Type locality "Dakota Group, or No. 1, of the Upper Missouri cretaceous, opposite Sioux City, on the Missouri, in Dakota County, Nebraska", USA; Dakota Fm., Late Cretaceous [details]