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Re: Ruben et al. article on-line
The article is pretty clear. Again, One man's collagen is another man's
feather-like structure. And, simply, looking at one type of graceful
supposedly birdlike dinosaur and claiming ALL dinosaur lungs share
crocodilelike lungs displays poor logic skills. You need a larger
sample base than 1.
from the article:
>> Paleontological and neontological evidence indicates that theropod
>> dinosaurs possessed unmodified, bellowslike septate lungs that were
>> ventilated with a crocodilelike hepatic-piston diaphragm.
And does this preclude featured crocodilians?
And the sidebar
displays a touch of focused professional zealotry:
>> _PALEONTOLOGY: Lung Fossils Suggest Dinos Breathed in Cold Blood_
>> by Ann Gibbons
>> When John Ruben first laid eyes on a high-quality photo of the so-called
>> "feathered" dinosaur from China last year, he was stunned. It wasn't the
>> featherlike structures that riveted his attention--he dismissed them as
>> collagen fibers (see sidebar)--but the theropod dinosaur's innards, which
>> were outlined in the slab of stone. "My eyes popped out," recalls Ruben,
>> a respiratory physiology expert at Oregon State University in Corvallis.
>> "I realized that here was the first evidence in the soft tissue that
>> theropods had the same kind of compartmentalization of lungs, liver, and
>> intestines that you would find in a crocodile"--and not in a bird.
So this does not resolve BADD or BCF one way or another.
What does the chromosomal data say about these early critters?
John R. Hutchinson wrote:
> At this URL you can see and download the latest from Ruben et al. It's a
> new thing for Science to allow free access to their articles. Darwin bless
> them. :)
> Look for "Lung lineage of theropods, Ruben et al., accompanying news story,
> and sidebar." Enjoy!
> --John R. Hutchinson