hunti on the basis of teeth described by Hunt and Lucas (1994). Heckert (2002) redescribed the genus in detail and named a second species, R. Later, other teeth were described by Padian (1990), Kaye and Padian (1994) and Hunt and Lucas (1994), from Chinle Formation of Arizona. All specimens were collected from the type locality, from the Bull Canyon Formation, dating to the Norian stage. callenderi was originally described as a basal ornithischian on the basis of 32 teeth: the holotype NMMNH P-4957 a nearly complete premaxillary ( incisiform) tooth, the paratypes (NMMNH P-4958-9, a nearly complete maxillary or dentary tooth crown with root and a nearly complete premaxillary tooth crown) and 28 referred specimens. The specific name honours the director of the New Mexico Museum of Natural History Jonathan F. Revuelto is derived from Spanish revuelta, "revolution", in reference to the importance of the Late Triassic period for terrestrial vertebrate evolution. The generic name honors its type locality, Revuelto Creek, Quay County of New Mexico. Hunt in 1989 and it is the type species of the genus. Teeth of Revueltosaurus callenderi collected in Petrified Forest National Park
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