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Re: FW: 6th International Congress of Comparative Physiology and Biochemistry (long)





Hillenius, W.J.

There is no credible evidence to support the reconstruction
of a derived, avian-like parabronchial lung/air sac system
in dinosaurs. [snip] The avian parabronchial lung/airsac system appears to be an attribute of ornithurine birds.

Now that's interesting, since it flies in the face of evidence (published by Britt et al. [1998] and Bonde and Christiansen [2000]) etc) that _Archaeopteryx_ had cervical air sacs, and perhaps abdominal air sacs as well. Further, the presence of pneumatic foramina ("pneumatopores") in the vertebral column of tetanurans (especially oviraptorosaurs, where it continues into the tail) suggests the presence of diverticula - meaning that tetanurans had already developed some aspects of the avian respiratory system prior to Ornithurae.


Anyway, to respond to Jordan's query, Carrier and friend's work on rotation inertia in theropods has been published:

Carrier, D.R., Walter, R.M., and Lee, D.V. (2001). Influence of rotational inertia on turning performance of theropod dinosaurs: Clues from humans with increased rotational inertia. Journal of Experimental Biology 204 (22): 3917-3926.



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