original description
White, C.A. (1885). On Marine Eocene, fresh-water Miocene, and other fossil Mollusca of western North America. <em>United States Geological Survey Bulletin.</em> 18: 1-26.
page(s): 177-178, pl. 2, 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): 93 [details] Available for editors [request]
From editor or global species database
Type locality "The North Fork of John Day River, Oregon, at the angle of the big bend, longitude 119° 40', latitude 44° 50'" (White 1885: 174), USA; John Day Fm., late Eocene-early Miocene [details]