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Re: Lewisuchus, a Dinosauriform


Mickey,
    Well, some workers still think herrerasaurs are basal dinosauriforms
rather than theropods, and that even Eoraptor may be more derived than
herrerasaurs.
                    -----Ken
P.S.  I could be wrong, but I don't think it matters if Lagosuchus is a
nomen dubium.  Family Lagosuchidae could still be the valid family name.
*****************************************

From: "Mickey Mortimer" <Mickey_Mortimer11@msn.com>
Reply-To: Mickey_Mortimer11@msn.com
To: <dinosaur@usc.edu>
Subject: Re: Lewisuchus, a Dinosauriform
Date: Sun, 22 Jul 2001 17:58:53 -0700

Ken Kinman wrote-

>     Thanks to all for the information.  I guess if it is congeneric with
> Pseudolagosuchus, then Lewisuchus will have priority.   Which I guess is
> best, if they are Lagosuchids, since it would look odd to have a
> Pseudolagosuchus in that family.
>       But I wonder if there is any chance they might be small
herrerasaurs?
> In the meantime will leave Pseudolagosuchus as a plesion splitting off
just
> above Lagosuchidae, but below herrerasaurs.

Neither Pseudolagosuchus nor Lewisuchus are lagosuchids.  In fact, neither
is Marasuchus or Lagosuchus.  Lagosuchus is an indeterminate dinosauriform,
so cannot have a family named after it.  The accepted phylogeny is-
_____Lagerpeton
|_____Marasuchus
 |_____Pseudolagosuchus
  |_____Dinosauria
If you're insisting on having Marasuchus in a family (perhaps to include
Saltopus as well), make it Marasuchidae.  Pseudolagosuchus is not a
herrerasaurid, Arcucci and others have proven it's more basal than
dinosaurs.  Perhaps I'll detail why tonight if I have time.

Mickey Mortimer


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