Full reference: J. H. Madsen, Jr. 1976. A second new theropod dinosaur from the Late Jurassic of east central Utah. Utah Geology 3(1):51-60
Sister taxa: none
Type specimen: UMNH VP 6373/UUVP 2826, a set of postcrania (left ilium). Its type locality is Cleveland-Lloyd Dinosaur Quarry, phase 2, which is in a Kimmeridgian pond claystone/lime mudstone in the Morrison Formation of Utah.
Ecology: ground dwelling carnivore