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Re: was: Pterosaur.net now: pteroid

On Jan 16, 2010, at 9:14 AM, jrc wrote:
> This is something of a digression, but the base of the quetz pteroid does not 
> resemble a ball joint.  It is a clearly defined hinge joint vaguely 
> reminiscent of a knee joint but with somewhat more lateral mobility than a 
> knee.  I think it might be a mistake to treat the pteroid articulation 
> generically as a ball joint.
> JimC
Indeed. As others have shown, nearly every pteroid has a distinct shape. In 
addition, some have a ball joint articulation. In others it is flat. And 
everything in between.