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Re: Definition of Dinosauria (was: underlying basis of classification)
On Tue, 13 Jul 1999 email@example.com wrote:
> On Tue, 13 Jul 1999 09:10:55 -0600 chris brochu writes:
> > Dinosauria is the last common ancestor of ornithischians and
> saurischians and all >of its descendents.
> Oh, ack. I thought Dinosauria was _Triceratops_ and all animals closer
> to _Triceratops_ than to either (_Aves_) or (_Avialae_) (depending
> on who's doing the definition). Was this latter definition discarded?
That definition was never used. That's pretty close to the definition of
Dinosauria is the most recent common ancestor of _Triceratops_ and modern
birds, plus all of its descendants.
--T. Michael Keesey
firstname.lastname@example.org | THE DINOSAURICON: http://dinosaur.umbc.edu/
AOL IM: RicBlayze | WORLDS: http://www.gl.umbc.edu/~tkeese1/