original description
White, C.A. (1878). Paleontological Papers No. 6: Descriptions of new species of invertebrate fossils from the Laramie Group. <em>Bulletin of the United States Geological and Geographical Survey of the Territories.</em> 4: 707-719., available online at https://www.biodiversitylibrary.org/page/31549803
page(s): 716 [details]
From editor or global species database
Type locality 7 miles N of Evanston ("7 miles west of Evanston, Wyo., near the boundary line between Wyoming and Utah"), Uinta County, Wyoming, United States; Bear River Formation, Albian, early Cretaceous [details]