original description
White, C.A. (1878). Paleontological Papers No. 6: Descriptions of new species of invertebrate fossils from the Laramie Group. <em>Bulletin of the United States Geological and Geographical Survey of the Territories.</em> 4: 707-719., available online at https://www.biodiversitylibrary.org/page/31549803
page(s): 711 [details]
basis of record
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313.
page(s): 105-106 [details] Available for editors [request]
From editor or global species database
Type locality "Laramie Group, Crow Creek, Colorado, about 12 miles north of its confluence with South Platte River", USA; Laramie Fm., Maastrichtian, Late Cretaceous [details]