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Re: Why Air Sacs?

On 11/17/06, Jerry D. Harris <jharris@dixie.edu> wrote:
A novel, and very interesting, interpretation in this remarkably comma-free

Farmer, C.G. 2006. On the origin of avian air sacs; pp. 89-106 in Milsom,
W.K., Powell, F.L., and Mitchell, G.S. (eds.), Frontiers in Comparative
Physiology. II. Respiratory Rhythm, Pattern and Responses to Environmental
Change. Respiratory Physiology & Neurobiology 154.

From a quadrupedal ancestry theropod dinosaurs evolved a bipedal posture.

Theropods evolved bipedal posture or simply inherited it from a ancestral saurischian dinosaur which in turn inherited from a ancestral dinosaur which in turn inherited from a ancestral dinosauriform organism?

The ptero hollow bones was lined with air-sacs?


Roberto Takata