original description
Meek, F. B. (1876). A report on the invertebrate Cretaceous and Tertiary fossils of the upper Missouri country. In: Hayden, F.V. (Ed.) Report of the United States Geological Survey of the Territories. 9: lxiv + 1–629, 45 pls., available online at https://www.biodiversitylibrary.org/page/2024294
page(s): 599, pl. 45, figs 6a-b [details]
From editor or global species database
Type locality Poeno Creek ("Pinots' Creek"), Pennington County, South Dakota, United States; White River Formation, late Eocene to early Oligocene [details]