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>A recent message on the list suggested that just about all South American
>Theropods were Ceratosaurs. What about Piatnitzksaurus? I have seen no
>recent literature on this genus. In the original description Bonaparte
>described the maxilla as having an acessory antorbital fenestra, does
>this make it more likely that it is a tetanuran?
Although Phil Currie thinks that Piatnizkysaurus is an ancestral abelisaurid
(I don't know what characters he uses for this statement), others (including
Fernando Novas, Bernardino Perez-Moreno, and myself) find Piatnizkysaurus as
a basal tetanurine, outside of the Allosauroid-Coelurosaur clade. In fact,
I find it outside of the Megalosauroid+(Allosauroid+Coelurosaur) clade, way
down at the base of Tetanurae.
Thomas R. Holtz, Jr.
Dept. of Geology
University of Maryland
College Park, MD 20742