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): 38, pl. 4, fig. 3a-f, pl. 5, fig. 1a-d [details] Available for editors [request]
From editor or global species database
Type locality "About 100 yards southeast of Vernal Summit on Uncompahgre Tunnel road of Uncompahgre project, Montrose County, Colorado", USA; Morrison Fm., Late Jurassic [details]