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): 33, pl. 11, figs 9, 11 [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): 197 [details] Available for editors [request]
From editor or global species database
Type locality Locality 315 at dam just below the railroad bridge at Vader, Lewis County, on the west bank of the Olequah Creek, about one-third of a mile below its junction with the Stillwater, Section 32, Township 11 North, Range 2 West, Washington, United States; Cowlitz Formation, Bartonian, late Eocene [details]