This taxon is considered subjective synonym of
of the valid taxon Edmontosaurus regalis
according to the Paleobiology Database.
See the page for Edmontosaurus regalis →
Bibliography
Original description
E. D. Cope. 1874. Report on the stratigraphy and Pliocene vertebrate paleontology of northern Colorado. Bulletin of the United States Geological and Geographical Survey of the Territories 1(1):9-22