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): 14, pl. 10, fig. 10 [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): 66 [details] Available for editors [request]
additional source
Modell, H. (1957). Die fossilen Najaden Nordamerikas. Ein Klassifizierungsversuch. <em>Archiv für Molluskenkunde.</em> 86(4/6): 183-200.
page(s): 199 [details] Available for editors [request]
From editor or global species database
Type locality "At locality 315 (University of Washington Palaeontological Collection) at dam just below the railroad bridge on west bank of Olequah Creek, about one-third of a mile below its junction with Stillwater Creek, near Vader, Lewis County, Section 32, Township 11 North, Range 2 West", Washington, USA [details]