Fig. 7From: Species concept in North American stegosaursComparisons of the skeletons of Stegosaurus stenops (USNM 4934) (a) and the holotype of Hesperosaurus mjosi (HMNH 001) (b). Based upon the criteria used to separate other dinosaurs, these two warrant separation at the genus level. a is courtesy of Gregory S. Paul. Scale bars 1 mBack to article page