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Re: Coracoid/scapula (was Re: flying Archie)
David Marjanovic wrote:
It would require two more reversals -- in *Sapeornis* and in
Confuciusornithidae. Four reversals instead of two or maybe three
acquisitions.
The condition is unknown in _Sapeornis_ and confuciusornithids because the
suturing/fusion obliterates the nature of the articulation. Thus, they
could have evolved from birds with the enantiornithean-style peg-and-socket
articulation, and the immobile joint could be secondary. Under this
scenario, the condition in _Sapeornis_ and confuciusornithids is not a
reversal. It would be (and has been) coded as '?'.
Cheers
Tim