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): 715 [details]
From editor or global species database
Type locality Black Buttes ("Black Buttes Station, Union Pacific Railroad"), Sweetwater County, Wyoming, United States; Lance Formation, Maastrichtian, late Cretaceous [details]