This dinosaur could be up to 3.4 meters (11 ft) long. It lived during the early Cretaceous Period, about 115–108 million years ago (from the mid-Aptian to early Albian stages). Fossils have been found in the U.S. states of Montana, Utah, Wyoming, and Oklahoma, in rocks of the Cloverly Formation, Cedar Mountain Formation, and Antlers Formation. It had a large claw on its foot.