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Re: New twist on pterosaur flight

> Just curious--is the conclusion that the pteroid is not the thumb
> metacarpal based on anything other than the phalangeal counts of
> the three short fingers?

Probably the phalangeal count of the wing finger (more than 3), and the 
expectation that the 5th finger should have been short in whatever the 
ancestors of pterosaurs were, consistent with the fact that the 2nd rather 
than the shorter 3rd finger bears the wing feathers in birds. (Outside of 
archosaurs the 4th finger is generally the longest.) Also, doesn't the 
pteroid insert on the proximal syncarpal?

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