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Re: Quadraped Sailbacks-All non-dinos?
On Tue, 25 Apr 1995 cristeaj@pt.Cyanamid.COM wrote:
> ...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.
The first three are very good criteria. The anatomical features uniting the
dinosaurs are rather subtle. A large, heavy tail carried off the ground is
I think the most obvious (but glyptodonts had one too, and perhaps some
synapsids). I don't like using paraphyletic groups like reptiles - and
sooner or later someone is going to ask him how to distinguish reptiles from
> 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!
Some dinosaurs had sails, smaller than those of Dimetrodon, Edaphosaurus,
etc. Spinosaurus and Ouranosaurus are examples, and if I remember rightly
both of these are thought to have been largely quadrupedal.