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): 42-43, pl. 10, fig. 13 [details]
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]