original description
Yen, T.-C. (1948). Paleocene fresh-water mollusks from southern Montana. <em>United States Geological Survey Professional Paper.</em> 214-C: 35-50.
page(s): 41, pl. 10, fig. 12 [details]
new combination reference
Russell, L.S. (1964). Cretaceous Non-marine Faunas of Northwestern North America. <em>Royal Ontario Museum and University of Toronto, Life Sciences, Contributions.</em> 61: 1-24., available online at https://www.biodiversitylibrary.org/page/36250220
page(s): 16 [details] Available for editors [request]
From editor or global species database
Type locality Locality 17, in Cedar Creek valley, Powder River County, Montana, United States; Fort Union Formation (Tongue River Member [Williston Basin]), Paleocene [details]