RE: Rauhut's Thesis

["Rob Gay" <rob_redwing@hotmail.com>]

> I dont quite understand what your saying.  The crest in D. wetherilli and
> "D." sinensis are formed by the same bones.<
Yes. And those are the bones that it would make sense to use, if forming two
lateral ridges, regardless of anything else. But, the morphology is very
different between the two (see my earlier message). These results seem to be
more the result of pressures selecting for two lateral ridges than of common
ancestry (which HP Headden has expounded on).

> Monolophosaurus has a crest that incorporates additional bones with quite a
> different morphology.<
Yes. But, its only singular, and more of a ridge than a crest. I'm not sure
if this animal is very useful for comparisons in this case.
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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