RE: Definitions

[Steven Mahon <floridamahon@yahoo.com>]

--- "Thomas R. Holtz, Jr." <tholtz@geol.umd.edu>
wrote:
> > I would like to know if there are any other
> > definitions of the following: Dinosauria,
> Saurischia,
> > Ornithischia, Theropoda & Sauropodomorpha. They
> dont
> > have to be explicitly defined.
> 
> I don't know what you mean by "other" definitions,
> but here are the
> phylogenetic definitions already published:

Oh, Sorry. What I meant was are there any phylogenic
definitions *other* than than the ones most widely
used. But, you answered my question anyways.:-) 
 
> Dinosauria is _Triceratops_, Aves, their most recent
> common ancestor, and
> all of its descendants (Padian and May, followed by
> Sereno 1997; however, a
> second school holds a definition _Iguanodon_,
> _Megalosaurus_, their most
> recent common ancestor, and all of its descendants).

What do you mean by second school?

> Sauropodomorpha is _Cetiosaurus_ and everything
> closer to it than to Aves
> (Padian et al. 1999) OR _Plateosaurus_,
> _Saltasaurus_, their most recent
> common ancestor, and all of its descendants
> (Sereno).

I thought it was Saltasaurus > Aves? Is there
something I'm missing?!
 
I also had heard that there might be a Dinosauria
definition that includes Herrerasaurus. Does it really
exist?

Also, I don't think I should have make a page for
every taxon. What main clades *should* I make pages of
that would represent the major clades well?

    Thanks Again,
      Steven Mahon 

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