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RE: Greg Paul's new (or newly named) iguanodonts
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of Tim Williams
> Tom Holtz wrote:
> > The original work of Gauthier, Clark & Benton, Parrish, &
> > back in the 1980s was really to sort out this mess, and
> resolve that
> > classic archosaurs fell into three clusters: dinosaurs, pterosaurs,
> > and their kin; primitive guys (the traditional "proterosuchians" as
> > well as Euparkeria and Proterochampsidae); and the
> croc-ankle cluster.
> There was a fourth category (not so much a 'cluster'), which
> might be called "WTF". Things like _Longisquama_ and
> _Sharovipteryx_ (_Podopteryx_) ended up here. :-)
But that really only existed in the "anti-dinosaurian origin of birds"
community (okay, and the Russians). It wasn't part of the normal discourse
> > And really: those who have argued for a "thecodont" origin
> since the
> > 1970s (Tarsitano, Martin, etc.) argued for relationships
> with animals
> > that thecodont workers (Charig, Parrish, Chatterjee) would not
> > consider thecodonts at all!!
> Except for maybe _Scleromochlus_ (which has popped up as a
> prospective'pro-avian' once or twice). But yes, I know
> exactly what you mean.
Okay, and _Lagosuchus_. But really, once you start arguing for origins
within Ornithodira, you really aren't terribly far off of the dinosaurian
origin hypothesis... :-)
> > (This is opposed to the Heilmann model, which did derive
> birds out of
> > Euparkeria-like forms).
> I think he might have put _Ornithosuchus_ there too. Not
> 100% sure though.
Thomas R. Holtz, Jr.
Email: email@example.com Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Earth, Life & Time Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA