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. Invertebrate Paleontology, 9, lxiv + 1–629, 45 pls., available online at https://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]