Re: Coracoid/scapula (was Re: flying Archie)

[David Marjanovic <david.marjanovic@gmx.at>]

> I'm not sure what you mean here.  What "convergence" are you referring to?

Between the shoulders of *Rahonavis* + *Shenzhouraptor* and those of derived 
Enantiornithes.

> How about this scenario.... the immobile scapulacoracoid is primitive, but
> enantiornithines and euornithines evolved peg-and-socket articulations
> independently (athough with opposite configurations); and the flat joint 
> is
> an intermediate step between the immobile joint and the peg-and-socket
> joint.

That's what I mean. The "long-tailed birds" evolved it a third time.