Reptilia - Dinosauria - Hadrosauridae

Alternative combinations: Anatosaurus saskatchewanensis, Thespesius saskatchewanensis

Full reference: C. M. Sternberg. 1926. A new species of Thespesius from the Lance Formation of Saskatchewan. Canada Department of Mines Geological Survey Bulletin (Geological Series) 44(46):73-84

Belongs to Edmontosaurus according to J. R. Horner et al. 2004

Sister taxa: Edmontosaurus annectens, Edmontosaurus regalis

Type specimen: NMC 8509. Its type locality is Wood Mountain, Rocky Creek, which is in a Maastrichtian terrestrial claystone/sandstone in the Ravenscrag Formation of Canada.

Ecology: ground dwelling herbivore