[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: FW: 6th International Congress of Comparative Physiology and Biochemistry (long)
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.  and Bonde and Christiansen ) 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):
Tired of spam? Get advanced junk mail protection with MSN 8.