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RE: Tyrannosaur analogs in the south?

On Fri, 30 Mar 2007, Thomas R. Holtz, Jr. wrote:
From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]On Behalf Of
Richard W. Travsky

The Late Cretaceous top predators of Gondwana were the Abelisauridae.
Not as big as the tyrannosaurids, nor were they particularly cursorial,
but like their distant northern kin they had stumpy arms.

Would that be a result of common origins or "lifestyle"?

Lifestyle (aka "convergence"), as more primitive tyrannosauroids (_Guanlong_, for example) and other coelurosaurs and basal tetanurines have much longer arms than tyrannosaurids.

So does that imply common origins?