Re: Lewisuchus, a Dinosauriform

["T. Mike Keesey" <tmk@dinosauricon.com>]

On Mon, 23 Jul 2001, Christopher Pearsoll wrote:

> So what order are the 'Lagosuchians' in and where do they fall within (
> or out ) of clade dinosauria?

Some of us prefer to eschew "orders" and other such arbitrary ranks.
"Lagosuchians" (a paraphyletic group) are in _Dinosauromorpha_, but not in
_Dinosauria_ (and all, except probably _Lagerpeton_, are in
_Dinosauriformes_).

--Dinosauromorpha
  |--Lagerpeton
  `--Dinosauriformes
     |  ?Lagosuchus [nomen dubium]
     |--Marasuchus
     `--+--Pseudolagosuchus
        `--Dinosauria

Is, I think, commonly accepted. (Some would place _Eoraptor_ and
_Herrerasauridae_ closer to _Dinosauria_ than _Pseudolagosuchus_ is --
others place them within _Dinosauria_.)
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