original description
Meek, F. B. (1876). A report on the invertebrate Cretaceous and Tertiary fossils of the upper Missouri country. In: Hayden, F.V. (Ed.) Report of the United States Geological Survey of the Territories. 9: lxiv + 1–629, 45 pls., available online at https://www.biodiversitylibrary.org/page/2024294
page(s): 568-569, textfig. 74, pl. 42, fig. 3 [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): 218 [details] Available for editors [request]
From editor or global species database
Type locality Mouth of Judith River, Fergus County, Montana, United States; Judith River Formation, Campanian, late Cretaceous [details]