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Coracoid/scapula (was Re: flying Archie)

David Marjanovic wrote:

Of course; *Sapeornis* has an immobile-looking suture. *Rahonavis* and *Shenzhouraptor, however, are reported to have the enantiornithean configuration (peg in coracoid, socket in scapula) of a real mobile joint.

You raise an interesting issue, David. If the enantiornithine configuration (peg on coracoid, socket in scapula) is primitive, how do you think the articulation switched over to the "modern" (euornithine) configuration (peg on scapula, socket in coracoid)? Did it pass through a configuration in which both articular surfaces were flat, like the condition in _Protopteryx_ (for example)?