original description
Russell, L. S. (1937). New non-marine Mollusca from the Upper Cretaceous of Alberta. <em>Transactions of the Royal Society of Canada, third series. Section IV - Geological Sciences.</em> 31: 61-67, 143.
page(s): 62-63, pl. 1, figs 4-6 [details] Available for editors [request]
additional source
Russell, L.S. (1964). Cretaceous Non-marine Faunas of Northwestern North America. <em>Royal Ontario Museum and University of Toronto, Life Sciences, Contributions.</em> 61: 1-24., available online at https://www.biodiversitylibrary.org/page/36250220 [details] Available for editors [request]
From editor or global species database
Type locality "from 'Pale' beds, Belly River formation, 73 feet above top of Foremost beds, in ls. 5, sec. 6, tp. 1, range 4, W. 4th mer., north side of Milk River valley near crossing of International boundary" (Alberta, Canada) [details]