original description
White, C.A. (1886). On the Fresh-water Invertebrates of the North American Jurassic. <em>United States Geological Survey Bulletin.</em> 29: 1-41.
page(s): 20, pl. 4, figs 8-9 [details]
From editor or global species database
Type locality 8 miles north of Cañon City, Colorado, United States; Morrison Formation (Atlantosaurus beds), late Jurassic [details]