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Re: Quadraped Sailbacks-All non-dinos?
On Tue, 25 Apr 1995 cristeaj@pt.Cyanamid.COM wrote:
> I was recently talking to an Earth science high school teacher about
> how he teaches his kids about what makes a dinosaur different from
> other prehistoric animals. He told me that he uses "quadraped
> sailbacks" (i.e. Dimetridon) as one discrimination as to what is _not_
> a dinosaur. I told him that there were other (better) ways to
> discriminate a dinosaur such as: (1) Lived only in the Mesozoic Era,
> (2) Walked with legs directly under the body (not sprawled), (3) Lived
> primarily on land, (4) Had unique anatomical structure (i.e. hips,
> etc), and (5) All dinos were reptiles.
> Although he uses some of the above, he still put in "Quad. Sailbacks".
> Are there any quadraped sailback dinos? I think the five
> qualifications above are enough to qualify for dinosaurian without the
> confusion of "Quad. Sailbacks". What do you think? Thanks!
There are examples of "sails" in dinosaurs, although not to the level of
development seen in non-dinosaurs creatures such as Dimetrodon.
Here are some examples:
Bipedal---> Spinosaurus, Acrocanthosaurus, Altispinax
Functionally bipedal--> Ouranosaurus, Hypacrosaurus
Quadrapedal--> Amargasaurus, Dicraeosaurus
---John Schneiderman (firstname.lastname@example.org)