Full reference: J. H. Ostrom. 1970. Stratigraphy and paleontology of the Cloverly Formation (Lower Cretaceous) of the Bighorn Basin area, Wyoming and Montana. Peabody Museum Bulletin 35:1-234
Sister taxa: none
Type specimen: AMNH 3041, a partial skeleton. Its type locality is AMNH 33-1, Middle Dome, which is in an Albian terrestrial claystone in the Cloverly Formation of Montana.
Ecology: ground dwelling omnivore
Average measurements (in mm): femur length 123.0, femur circumference 35.0, humerus length 81.5, tibia length 155.0, tibia circumference 33.0, ulna length 78.0
Estimated body mass: 5.51 kg based on femur length