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Re: Turbinates as endothermy criterion??
On Mon, 26 Feb 1996, Thomas Duffy wrote:
> "Ruben was interestested in the front of the snout.
> He saw--or rather, didn't see--just what he expected. Dino
> lacked respiratory turbinates, tiny bones in the nasal passages
> of warm-blooded animals that limit water loss during breathing.
I'd like to know more about these turbinates, what exactly they do, and
how Ruben can prove that warm-blooded animals cannot possibly live
without them. Might the situation be complicated by the dinosaurs'
> This particular dinosaur, known technically as Ornithomimus,
It would take an *awful* lot of convincing to get me to believe that
_Ornithomimus_, in particular, was cold-blooded.
> is one of a handful of dinosaur groups that Ruben has examined.
> All lack the special bones.
"a handful?" How many dinosaurs constitute a handful? Does a "handful"
really constitute a definitive study?
> 'We can make a real strong argument that all the meat-eating
> dinosaurs were cold-blooded,' he said."
There's a leap of faith if I ever saw one.
> I know that isn't much info, but that's really all it says
> about his actual research or evidence. Has anybody else heard
> anything about this turbinate issue, or know anything about it,
> or even have an opinion? Any info would be appreciated...
Well, I *do* know (or, at least, I have heard) that _Nanotyrannus_ has
some sort of turbinal structure in its nose, and that _Euoplocephalus_
and _Drinker_, at least, are said to as well.
> Thomas Duffy
Pacific Lutheran University
Tacoma, WA 98447
"The secret of the universe is &^*!&$~%**&%&^^^^^^^ NO CARRIER"