PaleoDB taxon number: 98778
Full reference: L. S. Russell. 1935. Fauna of the upper Milk River Beds, southern Alberta. Transactions of the Royal Society of Canada, series 3 4(29):115-128
Type specimen: GSC 8851, a partial shell. Its type locality is Deadhorse Coulee, Locality 8, which is in a Santonian terrestrial horizon in the Milk River Formation of Canada.