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): 43, pl. 6, figs 13a-b [details] Available for editors [request]
From editor or global species database
Type locality Locality 5, Felch's Ranch, Garden Park, 9 miles north of Canon City, Fremont County, Colorado, United States; lower Morrison Formation, late Jurassic [details]