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Re: CNN on Lungs and Feathers
At 09:55 PM 1/5/98 -0800, Terry D. Jones wrote:
>So by this reasoning turtles, crocs, and lizards--animals with
>pneumatized vertebrae--also had air sacs?
Do they have true pneumatized vertebrae, or merely excavated vertebrae?
There is a difference. (Look at the cross-section of an _Allosaurus_
vertebra in Farlow's book to see what I mean). That sort of structure only
forms where epithelial tissue invades the bone.
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