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Re: Dilophosaurus

On Mon, Aug 29, 2011 at 4:49 AM, Thomas R. Holtz, Jr. <tholtz@umd.edu> wrote:
> Averostra (Ceratosauria + Tetanurae)

Averostra's original definition is apomorphy-based, and, as Mickey
Mortimer pointed out, it's a very difficult one to apply:

Fortunately the ceratosaur-tetanurine node already has a name: Neotheropoda.

(Yes, some definitions anchor Neotheropoda on Coelophysis rather than
Ceratosaurus, but this is in direct conflict with the original usage,
which specifically excluded podokesaurids, i.e., coelophysids.)
T. Michael Keesey