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re: Jaime's ptero comments
The material shows an articulation of humerus, forearm,
and set of elongated "phalangeal" bones that defies interpretation other
than the wing finger of a pterosaur. This is done without the authors on
the paper being called into question as a possible excuse to dismiss the
I'm not saying that the new found creature is not a pterosaur. It is one. And
I'm not saying it's not an egg. I believe it to be so.
Scratch your heads for awhile and come up with another possibility. I have, and
the bones are confirming it.
Regarding juvenile cartilage vs. bone: in the little reading I've done on
pterosaur histology one point is made by the authors and that is pterosaur bone
develops differently than that of any other vertebrate. The details are in the
literature. What is happening in the juvies I cannot say, but apparently it is
not quite like that of any other diapsid clade.
Have great weekend,