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Re: Size of Theropods -Reply
On Tue, 23 Jan 1996, Scott Horton wrote:
> >Now that coelurosaurs have got pretty big with the inclusion of
> >tyrannosaurs, just what is an acceptable definition of the differences
> >between the two?
> >Graeme Worth
> I thought that the inclusion of tyrannosaurs into ceolurosauria (or
> whatever the term is) was still being considered heretical or at least very
> controversial. Has it gained general acceptance? Is Tyrannosaurus more
> closely related to Deinocheirus than to, say, Allosaurus?
There are certainly a number of scientists which are coming to accept the
conclusion that tyrannosaurs, troodonts, and ornithomimosaurs are closely
related to each other and quite close to the birds.
Yes, Tyrannosaurus, as a tyrannosaur, is fairly close to Deinocheirus, an
ornithomimosaur. Tyrannosaurs show no particularly close relationship to
allosaurs at all. Their common features are most likely parallel
developments for large theropods.
> I remember about a year ago, Mickey suggested that the claw
> could have been used to climb trees in the fashion of people who used
> cleated shoes to climb telephone poles.
I don't know if it would be exacly applicable for dromaeosaurs proper,
but I recently suggested to Dinogeorge that the hyperextensible second
toe, also present in the dromaeosaur relative _Archaopteryx_, might have
initially evolved for this purpose.
Pacific Lutheran University
Tacoma, WA 98447
"If you can't convince them, confuse them." -- Harry S. Truman