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Re: The New Paper That Time Forgot
My question in regard to all of this is do we actually know that any
dinosaur had a cross-current unidirectional system in place? I can accept
that the most bird like dinosaurs (maniraptors, deinonychosaurs etc)
probably had the full suite of avian respiration in place, but I'm less
inclined to say the same thing for dinos further from the avian side of
We have evidence of air sacs, but what evidence do we have for
unidirectional flow of air? Surely one likely came before the other. As
there are other animals today (certain snakes and insects) that have air
sacs, but no flow through system of gas exchange, I'm inclined to think
that air sacs came first; flow through second.
Sure, but what is the possession of both cervical and abdominal air sacs
good for? And evidence for both is known from carnosaurs (most prominently
*Aerosteon*) and sauropods.
The authours [sic] argued that Lehman and Woodward had based their data
strictly off of long bone studies, but they didn't. Lehman and Woodward
used the exact same specimens that Erickson et al had used. Sander and
Clauss obviously had no problem with those specimens, as Erickson et al
was frequently cited, so I see no reason for them to complain about the
Lehman and Woodward study either.
OK, I'll read the paper. (I'm woefully behind on dinosaur literature.)
The authours also stated that gastric mills were not present in sauropods.
Has that been confirmed now? Are sauropods officially considered not to
have gizzards anymore?
There was a paper on this topic a few months ago that got a lot of DML
coverage, as I recall.