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New paper on a Middle Triassic rauisuchian



Nesbitt, S.J., 2005. A new archosaur from the upper Moenkopi Formation (Middle Triassic) of Arizona and its implications for rauisuchian phylogeny and diversification. N. Jb. Geol. Palaont. Mh. 2005 (6): 332-346.

ABSTRACT: Isolated archosaurian remains consisting of pelvic elements and femora from the upper Moenkopi Formation (Middle Triassic) of Arizona are similar to the Late Triassic 'rauisuchians' *Chatterjeea* and *Sillosuchus*. The new material is a 'rauisuchian' hypothesized to be more closely related to *Chatterjeea* and *Sillosuchus* than to *Poposaurus*, *Arizonasaurus*, and other rauisuchians. The Moenkopi form material helps polarize characters for a small group of 'rauisuchians'. If current archosaur phylogenies are correct, then the presence of a *Chatterjeea*-like taxon in the Moenkopi Formation indicates that many of the archosaurian groups radiated by the early Middle Triassic.

This paper does not name any new taxa.