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Re: tyrannosaurid ancestry, raptors and other fun things...
In a message dated 11/16/99 12:44:36 AM Pacific Standard Time,
> Also, what makes Siamotyrannus' (Berriasian-Barremian)
> referral to the Tyrannosauroidea ambiguous? It seems to share quite a few
> synapomorphies with tyrannosaurids.
Admittedly, this is an odd-looking specimen, but certain list members think
the pelvis in particular (especially the ilium) has more in common with
allosauroids than tyrannosaurs.