[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

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.

--------------
May the peace of God be with you.         sarima@ix.netcom.com
                                          sfriesen@netlock.com