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I have a question regarding the pectoral girdle of Archaeopteryx - a few
1) As this is often referred to as "the first bird," did it possess the
standard bird-like pectoral girdle (fused clavicles+interclavicle=furculum,
large coracoids articulating with the sternum (did it even have a sternum?),
blade-like scapula oriented parallel to the spinal column), or did that come
2) If the bird-like shoulder girdle came later, what, then, was the form of
3) If Archaeopteryx DID have the bird-like girdle, what other dinosaurs do
we find this in?
In a quasi-related topic, what was the pectoral girdle of pterosaurs like,
and how was the flight-stroke accomplished in these animals?
Thanks for your help!