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Re: pteros have lift-off
Augusto Haro wrote:
> > Elongation of the forelimbs is a character that
> appears to be primitive for coelurosaurs.
> but not to the degree of Archaeopteryx, I suppose...
True. But context is important here, which was (to quote D. Peters):
"Archaeopteryx and other birdy descendants of short-armed theropods".
Whichever ancestral group DP had in mind (= basal eumaniraptorans, basal
maniraptorans, or basal coelurosaurs), I wouldn't characterize any of these as
"short-armed". I'd be surprised if GSP did either.
Forelimb (especially manus) elongation by birds was not a revolutionary change.
It was a further extension of the ancestral "long-armed" condition of
coelurosaurs. Therizinosaurs also show increased forelimb elongation, but for
very different reasons to birds (presumably).