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Re: Birds?Dinos?



ok, we probably been over this (on the list) in the past-but...
why the 'most recent common ancestor of _Triceratops_" equaling
Dinosauria??
Why not Igunanodon as it's historical connection as first named
Dinosaur?
Was this picked from a hat or was there a better reason?

-Betty Cunningham

T. Mike Keesey wrote:
> They are all dinosaurs, flightless or not. Any creature descended from the
> most recent common ancestor of _Triceratops_ and modern birds is, by the
> cladistic definition of Dinosauria, a dinosaur.