original description
Meek, F.B. (1860). Descriptions of new fossil remains collected in Nebraska and Utah, by the exploring expeditions under the command of Captain J. H. Simpson, of U. S. Topographical Engineers, [extracted from that officer's forthcoming report]. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 12: 308-315., available online at https://www.biodiversitylibrary.org/page/26297455
page(s): 312 [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): 90 [details] Available for editors [request]
From editor or global species database
Type locality "Freshwater Tertiary bed, near Fort Bridger and south of there, at the base Uintah Mountains, lat. 41 ° 40' north, long. 110° 10' west", Wyoming, USA; Bridgerian, early Eocene [details]