original description
Russell, L.S. (1931). Early Tertiary Mollusca from Wyoming. <em>Bulletins of American Paleontology.</em> 18(64): 1-38, 4 pls., available online at https://www.biodiversitylibrary.org/page/30409192
page(s): 8, pl. 1, fig. 9 [details]
additional source
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313.
page(s): 183 [details] Available for editors [request]
From editor or global species database
Type locality South side of Polecat Bench, north of Powell, Park County, Wyoming, United States; Tiffanian (zone Ti3-Ti4), Selandian, middle Paleocene [details]