original description
Yen, T.-C. (1954). Nonmarine Mollusks of Late Cretaceous Age From Wyoming, Utah and Colorado. Part 1: A fauna from western Wyoming. <em>United States Geological Survey Professional Paper.</em> 254-B: 45-59.
page(s): 56, pl. 17, fig. 52 [details] Available for editors [request]
From editor or global species database
Type locality "Locality 8—SE1/4 SW1/4 sec. 25, T. 28 N., B. 119 W., Graham coal mine, about 41 miles north of Sage Junction, Lincoln County, Wyo.", United States [details]