Talk:Pisanosaurus

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[edit] Systematics of Pisanosaurus and its implications for the rarity of Triassic ornithischians

The type species of Pisanosaurus is Pisanosaurus mertii Casamiquela, 1967. The reclassification of Revueltosaurus as a pseudosuchian by Parker et. al. (2005) has cast into the doubt the ornithischian status of Azendohsaurus, Crosbysaurus, Galtonia, Lucianosaurus, Pekinosaurus, Protecovasaurus, Technosaurus, and Tecovasaurus. The erasing of the record of ornithischian dinosaurs from the Triassic of North America and Europe restricts the distribution of Triassic ornithischians to Africa and South America. Irmis et, al. (2006) show that the report of an unnamed ornithischian from the Late Triassic of South Africa can be considered the only probable record of a Triassic ornithischian from Africa. Only Pisanosaurus and an unnamed Argentinan heterodontosaurid from South America are the only confirmed Triassic ornithischians from South America. The data show that Ornithischia was not as diverse as Saurischia in the Triassic as scientists previously thought.

Parker, W. G., R. B. Irmis, S.N. Nesbitt, J. W. Martz, and L. S. Browne. 2005. The Pseudosuchian Revueltosaurus callenderi and its implications for the diversity of early ornithischian dinosaurs. In Proceedings of the Royal Society London B 272(1566):963–969.

Irmis, R.B., Parker, W.G., Nesbitt, S.J., and Liu, J. (2006). Early ornithischian dinosaurs: the Triassic record. Historical Biology, iFirst article, 1-20. DOI: 10.1080/08912960600719988. (will alter after print publication) —The preceding unsigned comment was added by 72.194.116.63 (talk) 04:44, 6 February 2007 (UTC).