original description
Yen, T.-C. (1946). Paleocene freshwater mollusks from Sheridan County, Wyoming. <em>American Journal of Science.</em> 244: 41-48., available online at https://doi.org/10.2475/ajs.244.1.41
page(s): 45, pl. 1, fig. 8 [details] Available for editors [request]
From editor or global species database
Type locality About 6 miles NE of Arvada, Sheridan County, Wyoming, United States; Fort Union Formation (Tongue River Member [Williston Basin]), Paleocene [details]