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Re: Diplodocus tooth occlusion

Quoting "Jaime A. Headden" <qilongia@yahoo.com>:

>   According to Barrett and Upchurch's work on the diet of diplodocids,
> premaxillary/maxillary teeth bear two sets of wear-facets, the dentary
> one, which are arranged in a manner to suggest that the upper teeth had
> "nipping" wear, and the lower dental occlussive wear, and that the lower
> jaw, which exhibited protraction, fit entirely withing the upper, but the
> teeth are hardly parallel to one another between jaws, but rather
> distinctly angled, around 30 degrees or more.

In other words, the lower jaw could be "stowed" with all the dentary teeth
fitting within the upper tooth row, or the lower jaw could be moved forward, so
that the upper and lower tooth rows formed a set of nippers.  Correct?

Nick Pharris
Department of Linguistics
University of Michigan