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RE: Dilophosaurus



> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] 
> On Behalf Of Mike Keesey
>
> 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:
> http://theropoddatabase.blogspot.com/2010/11/averostra-and-ave
poda.html
> 
> 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.)

Yes, such was the original intent of each. However, both have migrated 
(crownward for Averostra, basally for Neotheropoda) into the
currently established uses, and it is almost cetainly these new incarnations 
will be the ones registered in the PhyloCode registry.
Them's the breaks...

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216                        
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/
Fax: 301-314-9661               

Faculty Director, Science & Global Change Program, College Park Scholars
http://www.geol.umd.edu/sgc
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA