In 2001, it represented the oldest known American stegosaur. "Kentrosaurus" was a small stegosaur. It was found alongside the plates and scapula of a stegosaur. It was a stegosaur found in China. In 1882, Marsh was able to publish the first skeletal reconstruction of a stegosaur. German paleontologist Friedrich von Huene considered it a very early stegosaur in 1950. "Gigantspinosaurus" was described by Peng and colleagues as a "medium-sized stegosaur". "Huayangosaurus" is the oldest and most primitive known stegosaur. Carpenter had originally concluded that "Hesperosaurus" was a rather basal stegosaur. Ankylosaurs replaced their stegosaur cousins in the Cretaceous. Undescribed stegosaur is present in the Wucaiwan member. The Tyrannosaurs begin to teach the juvenile how to hunt, stalking a stegosaur. Also, Stegz was an anthropomorphic stegosaur featured in the series "Extreme Dinosaurs". Note that the stegosaur group of dinosaurs went extinct around this time. Fossil stegosaur tracks have been reported from the formation.