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Re: tiny-armed theropods

Let us also remember that there is a great chance that there is not a single 
explanation for the different lines. What may be, at least in part, a 
developmental strategy for tyrannosaurids may not work at all for earlier 
theropods. Bipedalism may simply be preadapted for the generation of various 
mechanisms for fore-limb reduction or, more probably, fore-limb variation which 
then leads to the bird oriogin stuffola.


-----Original Message-----
>From: Augusto Haro <augustoharo@gmail.com>
>Sent: Oct 5, 2011 10:16 AM
>To: Dinosaur Mailing List <dinosaur@usc.edu>
>Subject: Re: tiny-armed theropods
>Forelimb reduction as a mass-reduction strategy may conceivably be
>also useful for small theropods if these need velocity. This may not
>apply to those which seem to be the faster dinosaurs, ornithomimids
>(unless their slender arms actually decreased their weight by becoming
>slender), but can apply to likely similarly fast alvarezsaurids.
>Although I agree that forelimb mass was relatively small, it is
>possible that for the sake of velocity or weight-saving even small
>weight saving bears an advantage.

Ralph E. Chapman
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