Traits name details
original description
Hanna, G. D. (1922). Fossil freshwater mollusks from Oregon, contained in the Condon Museum of the University of Oregon. <em>University of Oregon Publication.</em> 1(12): 1-22., available online at https://www.biodiversitylibrary.org/page/20825593 page(s): 4, pl. 1, figs 1-3 [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): 245 [details] Available for editors 
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