Fwd: Rauhut's Thesis (my thoughts on some parts)

["Jaime A. Headden" <qilongia@yahoo.com>]

  By Rob's tone, I assume this message was intended to go to the
list, instead of just me ...

begin:

--- Rob Gay <rob_redwing@hotmail.com> wrote:
> From: "Rob Gay" <rob_redwing@hotmail.com>
> To: qilongia@yahoo.com
> Subject: Rauhut's Thesis (my thoughts on some parts)
> Date: Fri, 06 Jul 2001 06:32:06
>
> In response to several things about Rauhut's thesis (which I
> would like a
> copy of, btw, whomever offered)
>
> >Welles (1976, 1984) and later Welles & Madsen (2000) to
> surmise that
> *Dilophosaurus* had a mobile premaxilla, which is certainly
> possible, though
> in agreement with Rowe (1989) I would say that the mobile
> premaxilla does
> not make the jaw "weak" but can in fact imply great structural
> capability.<
> While the idea of a mobile premax is certainly very cool, to
> say the least,
> at least in _Dilophosaurus_, it is not likely (nor in any
> coelophysoid
> dinosaur, IMNSHO). Internally, the premax is firmly braced to
> the maxilla by
> a very large ridge of bone, that would seem to entirely
> preclude movement in
> the snout.
>
>
> >I can't judge that, but these characters sound pretty weak,
> IMHO.<
> I would agree. Putting an animal that is apparently disputed
> to be
> dinosaurian or not into a fairly well established group on the
> basis of two
> characters sounds pretty weak to myself as well. However, I am
> not very
> familiar (yet!) with this beast, so I may have something more
> to say on this
> later.
>
> On the placement of _Dilophosaurus_ and _Segisaurus_:
> I actually agree with his placement of _Dilophosaurus_ outside
> of the usual
> coelophysid tree. In fact, this agrees nicely with my (albeit
> limited)
> analysis that put _Dilophosaurus_ as a sister taxa to this
> group. I also
> find it interesting that _Segisaurus_ ends up as a basal
> coelophysid...but
> maybe that's me just being me.
>
> ><I'm already waiting that Dryptosaurus becomes a
> ceratosaur...><
> Wait and see, coelophysoids are actually the closest ancestor
> to
> birds...oy...someone help, it's getting late.
> Peace,
> Rob
>
> Student of Geology
> Northern Arizona University
> Biological Science Tech
> Manti-La Sal National Forest
> AIM: TarryAGoat
> http://www.geocities.com/elvisimposter/dinopics.html
> http://www.cafepress.com/RobsDinos
> "A _Coelophysis_ with feathers?"
>
>
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