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Re: [dinosaur] Dinosauria reclassification joins Ornithischia and Theropoda in Ornithoscelida

Gesendet: Freitag, 24. März 2017 um 07:50 Uhr
Von: "Mike Habib" <biologyinmotion@gmail.com>

> it may be worth considering if the supinated forelimb anatomy in dinosaurs 
> was mostly a side effect of the specific pathway they took for forelimb 
> reduction.

To have the forelimbs locked in a supinated position is plesiomorphic. 
Crocodiles have this condition, *Acanthostega* has it. It is actually hard to 
get rid of while staying quadrupedal. Its persistence in theropods certainly 
rules out certain hypotheses on what theropod forelimbs were used for before 
flying became fashionable, but it doesn't itself require an explanation.