original descriptionHanna, G.D. (1920). Miocene Land Shells from Oregon. <em>The University of Kansas Science Bulletin.</em> 13(1): 3-12., available online athttps://www.biodiversitylibrary.org/page/4397878 page(s): 5-6, pl. 1, figs 1-3 [details]
basis of recordHenderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313. page(s): 157 [details] Available for editors [request]
additional sourceHanna, 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 athttps://www.biodiversitylibrary.org/page/20825598 page(s): 2, pl. 1, fig. 1a, b [details]
additional sourceRoth, B. (1986). Land mollusks (Gastropoda: Pulmonata) from Early Tertiary Bozeman Group, Montana. <em>Proceedings of the California Academy of Sciences.</em> 44(11): 237-267., available online athttps://www.biodiversitylibrary.org/page/16005679 page(s): 263 [details] Available for editors [request]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Classification Genus of original proposal almost certainly incorrect; allocation uncertain, possibly helicoid (Pilsbry 1946; Solem 1979). [details] Type locality Cove Inlet, John Day river, Oregon, United States [details]
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