RE: Thecodontia defined and saurischian Marasuchus

["Thomas R. Holtz, Jr." <tholtz@geol.umd.edu>]

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> T. Michael Keesey
> Sent: Monday, March 07, 2005 6:47 PM
> To: Dinosaur Mailing List
> Subject: Re: Thecodontia defined and saurischian Marasuchus
>
>
> > Neotheropoda (Ceratosaurus + Allosaurus)
> > I have to agree with Wilson et al. (2003) that the more inclusive
> > (Coelophysis+birds) definition has priority.
>
> CMIIW, but I think that, as originally used by Bakker, coelophysoids
> (well, podokesaurids) were explicitly excluded.

Correct, in both The Dinosaur Heresies, and as Bakker et al. in the 
Nanotyrannus paper in Hunteria. This is the reason Padian,
Hutchinson and I explicitly hung the name on Ceratosaurus rather than 
Coelophysis, and why I was unhappy with the Sereno definition.

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> Tim Williams
>
> >Pachypodosauria (Morosaurus <- Allosaurus)
> >And Morosaurus is used instead of Camarasaurus why?  Interesting idea for
> >the stem-sauropodomorph group though.
>
> I believe the clade Pachypodosauria was erected by Cooper (1985) for
> Sauropodomorpha.

Pachypodosauria itself was coined by von Huene in 19... something (have to go 
check): a group comprising Carnosauria ("modern"
carnosauria plus megalosaurs) plus Sauropodomorpha but excluding Coelurosauria 
(his version: the amalgam of coelophysoids,
Ceratosaurus, and "modern"-type coelurosaurs (including tyrannosaurs), 
exclusive of birds). He concieved of Pachypodosauria as
monophyletic, with carnosaurs actually being phylogenetically closer to 
sauropodomorphs than to coelurosaurs.

                Thomas R. Holtz, Jr.
                Vertebrate Paleontologist
Department of Geology           Director, Earth, Life & Time Program
University of Maryland          College Park Scholars
        Mailing Address:
                Building 237, Room 1117
                College Park, MD  20742

http://www.geol.umd.edu/~tholtz/
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