original description
Yen, T.-C. (1952). Molluscan Fauna of the Morrison Formation. <em>United States Geological Survey Professional Paper.</em> 233-B: 21-51.
page(s): 41, pl. 6, figs 10a-b [details] Available for editors [request]
From editor or global species database
Type locality "Locality 23. Forty feet above base of Morrison formation; 1,000 feet due south of the bridge over San Rafael River on Hanksville Green River Road, about 15 miles SW. of Green River, Emery County, Utah", United States [details]