nearly complete specimen PEFO 34561 which have been fully reconstructed recently. According to Sterling J. Nesbitt (2011), much of the Revueltosaurus cranial and postcranial material originates from a monotypic bonebed. Some specimens occur as isolated bones, while others are completely associated and even fully articulated. Thus, nearly the entire skeleton of R. callenderi is known and a full description of it is being prepared. Revueltosaurus hunti R. hunti was named by Andrew B. Heckert in 2002 as a basal ornithischian. The specific name honours the paleontologist Adrian P. Hunt for his contributions to the Triassic paleontology. It is known from the holotype NMMNH P-29357, a nearly complete tooth crown, the paratypes NMMNH P-29358-9 and topotypes P-29347-54 (and aff. R. hunti specimens NMMNH P-29355, P-29359) which were collected in the NMMNH locality 1171, Santa Fe County, New Mexico from the Los Esteros Member of the Santa Rosa Formation, Chinle Group, dating to the latest Carnian stage (Adamanian). Other isolated teeth (which Long and Murry (1995) assigned to R. callenderi) were collected two localities in the Blue Hills, east-central Arizona, from the Blue Mesa Member of the Chinle Formation, dating also to the latest Carnian. UCMP locality V92048 have yielded the topotypes UCMPV 173839-41, and the referred teeth UCMPV 139563-75 are from UCMP locality V7307. Parker et al. (2005) confirmed that R. hunti may be assignable to Revueltosaurus, on the basis of undescribed squamosal collected from its referred locality that is nearly identical to that seen in the Petrified Forest material of R. callenderi, thus suggesting that R. hunti is a pseudosuchian. In response to the report that R. callenderi was not an ornithischian, Heckert (2005) erected a new genus for R. hunti, Krzyzanowskisaurus. He suggested that the denticulated shelf on the teeth represented a cingulum. Irmis et al. (2007) and Nesbitt et al. (2007) synonymized Krzyzanowskisaurus with Revueltosaurus, and argued that this condition of the dentation is an autapomorphy of R. hunti and is not homologous to the ornithischian asymmetric swelling or a mammalian cingulum. Revueltosaurus olseni R. olseni was named by Hunt and Lucas in 1994 as a basal ornithischian, under the generic name Pekinosaurus. The generic name honors Pekin, North Carolina, where its type series was collected. The specific name honours the paleontologist Paul E. Olsen. Hunt and Lucas named the genus on the basis of the teeth series YPM 7666-9. Note that they designed the holotype to be