Regnosaurus

Abstract: The type specimen of Regnosaurus northamptoni Mantell, a partial right mandible, is redescribed and compared with a wide variety of dinosaurian taxa. We suggest that Regnosaurusis not an ankylosaur or a sauropod as previously thought, but represents the fragmentary remains of a ‘primitive’ stegosaur. Regnosaurus and Huayangosaurus share two derived characters, suggesting that these two genera should be provisionally regarded as sister taxa. The implications of these findings for stegosaur evolution and biogeography are discussed briefly. © 1995, Cambridge University Press. All rights reserved.