original description
Meek, F.B.; Hayden, F.V. (1858). Descriptions of New Organic Remains collected in Nebraska Territory in the year 1857, by Dr. F. V. Hayden, Geologist to the Exploring Expedition under the command of Lieut. G. K. Warren, Top. Engr. U. S Army, together with some remarks on the Geology of the Black Hills and portions of the surrounding Country. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 10: 41-59., available online at https://biodiversitylibrary.org/page/47535581
page(s): 52 [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): 75 [details] Available for editors [request]
basis of record
Yen, T.-C. (1952). Molluscan Fauna of the Morrison Formation. <em>United States Geological Survey Professional Paper.</em> 233-B: 21-51.
page(s): 36, pl. 3, figs 5a-c [details] Available for editors [request]
From editor or global species database
Type locality "Southwest base of Black Hills, in lower part of No. 1", South Dakota, USA; Morrison Fm., Late Jurassic [details]