Traits name details
original description
Hanna, G.D. (1920). Fossil mollusks from the John Day Basin in Oregon, contained in the Condon Museum of the University of Oregon. <em>University of Oregon Publication.</em> 1(6): 1-18., available online at https://www.biodiversitylibrary.org/page/20825598 page(s): 4-5, pl. 1, fig. 3a-c [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): 160 [details] Available for editors 
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