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Re: Ouranosaurus - how many species? Other "spino"-Igaunodontids?

What about the Permian - Dimetrodon, Edaphosaurus, etc.?
And why would there be so many other species that thrived without this adaption 
in the early Cretaceous?

--- On Wed, 10/28/09, Jonas Weselake-George <ee555@ncf.ca> wrote:

.. This would also nicely explain the
> surprising relative lack of humped or sailed species in
> other time periods.