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Re: Senter 2006, Confuciusornis, and humeral mobility



On Wed, Mar 23, 2011 at 11:59 AM, Jason Brougham <jaseb@amnh.org> wrote:

> Confuciusornis should have had extremely low scapular mobility. The coracoids 
> and scapulae are fused (Chiappe et al. 1999) and the coracoids attach to the 
> sternum at a wide facet.<

Quite so.  Pretty much without exception pectoral girdle mobility is
sacrificed progressively at the level of Maniraptora on up to Aves.
Reduction in overall dorsal flexibility (which of course is in part
tied to pectoral girdle mobility) with concurrent increases of
mobility in the cervical series follow the same pattern.

Maniraptorans are the anti-squirrels.

-Scott

-- 
Scott Hartman
Scientific Advisor/Technical Illustrator
(307) 921-9750
www.skeletaldrawing.com