original description
Weaver, C. E.; Palmer, K. V. W. (1922). Fauna from the Eocene of Washington. <em>University of Washington Publications in Geology.</em> 1(3): 1-56, pls 8-12., available online at https://www.biodiversitylibrary.org/page/17201643
page(s): 44, pl. 12, figs 2-3 [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): 224 [details] Available for editors [request]
From editor or global species database
Type locality At localities 315, 316, and 317 on Olequah Creek and Stillwater Creek, near Vader, Lewis County, Section 20, Township 11 North, Range 2 West, Washington, United States; Cowlitz Formation, Bartonian, late Eocene
[details]