original description
Stanton, T.W. (1899). Mesozoic Fossils. In: Hague, A.; Iddings, J.P.; Weed, W.H.; Walcott, C.D.; Girty, G.H.; Stanton, T.W.; Knowlton, F.H. (eds) Geology of the Yellowstone National Park. Part II. Descriptive Geology, Petrography, and Paleontology. U.S. Geological Survey, Washington, pp. 600-650., available online at https://www.biodiversitylibrary.org/page/27063533
page(s): 632, pl. 75, fig. 6 [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): 221 [details] Available for editors [request]
From editor or global species database
Type locality Three Forks Valley, Montana; [...] in the Gallatin Range and at several points in the northwestern part of Yellowstone National Park, Montana, United States; Albian, early Cretaceous [details]