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Re: Tyrannosauridae (Alioramus, etc.)
In a message dated 6/28/01 10:28:31 AM Pacific Daylight Time, HPB1956@aol.com
"Contrary to one hypothesis, because of the primitive state of the
obturator notch of the pubis in Siamotyrannus, tyrannosaurids
cannot be derived from allosaurids, in which this character is more
advanced. However, this would not preclude derivation from
sinraptorids, in which the obturator notch is more primitive."
But in fact the obturator notch of the pubis in _Siamotyrannus_ is SO
primitive that tyrannosaurids couldn't be derived from coelurosaurs, either,
if _Siamotyrannus_ were a tyrannosaur--which I very seriously doubt.