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Re: pubic boots and hepatic piston lungs
John R. Hutchinson writes;
> Birds, on the other hand, developed their air sacs (esp. the large
>posterior sac) late in their evolution, as evidenced by the uncinate
>processes, enlarged sternum, and loss of gastralia (in Ornithothoraces?
>sorry, no papers handy, but at least excluding Enantiornithes according to
>Ruben) that other theropods lack. Those features are apparently correlated
>with the flexibility of the ribcage / expansion of the air sacs.
As long as we are on the subject, what are the latest theories about how/why
air sacks evolved?
This can of worms opened by...
Orphan Vertebrate Paleontologist
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's
-- Isaac Asimov
- air sacs
- From: Ronald Orenstein <email@example.com>
- From: Brian Curtice <firstname.lastname@example.org>