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Re: Quo vadis, T. rex?
On Fri, 2 Feb 1996 Dinogeorge@aol.com wrote:
> Not quite that easy, I'm afraid. There's still a distal ischial expansion in
> the ornithomimid pelvis that needs to be taken care of, and of course the
> pubic boot has to enlarge also. Also, the ornithomimid ischium has a
> differently shaped and positioned obturator process from that of
> tyrannosaurids and is more downcurved. It's easier to get to the
> tyrannosaurid pelvis from _Compsognathus_ than from an ornithomimid.
The pelvis of _Dromiceiomimus_ shows a nice distally-placed obturator
process, and a few tyrannosaurid ischia do show a bit of a hook at the
distal end, like that in an ornithomime.
Actually, I was being (partly) flippant. Granted, the ischium of
_Compsognathus_ looks quite like that of a tyrannosaur. It is also
rather like that of an ornithomimosaur and, with a bit of pushing and
pulling, could me made to look like that of a troodont. The
earliest-known troodont, _Sinornithoides youngi_, has a dorsally
curved iliac margin like that of Compy, BTW. Again, _Compsognathus_ would
not make a bad basal arctomet--with the same caveats as stated earlier.
I'm not sure the traditional restoration of Compy's foot isn't invested
with a fair amount of imagination. How's the foot on the French specimen?
Bye for now!
Pacific Lutheran University
Tacoma, WA 98447
"If you can't convince them, confuse them." -- Harry S. Truman