Stanton, T.W.; Hatcher, J.B. (1905). Geology and paleontology of the Judith River beds. <em>United States Geological Survey Bulletin.</em> 257: 1-123., available online at https://pubs.usgs.gov/bul/0257/report.pdf
page(s): 115, pl. 13, fig. 5 [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): 209 [details] Available for editors [request]
Johnston, P.A.; Hendy, A.J.W. (2005). Paleoecology of Mollusks from the Upper Cretaceous Belly River Group. In: Currie, P.J.; Koppelhus, E.B. (eds) Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington, pp. 139-166.
page(s): 166 [details] Available for editors [request]
From editor or global species database
Type locality "From near the base of the Judith River beds on Milk River 6 miles below Pendant d'Oreille, Assiniboia, and it was collected at several other localities near there, at one point ranging down into the top of the Claggett formation." (Alberta, Canada) [details]