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Therizinosauroidea Tooth Record



Thomas Holtz (tholtz@geol.umd.edu) wrote:

<One curious thing about North American Campano-Maastrichtian
titanosaurs: their teeth are not showing up in well-studied
units like the Two Medicine, Judith River Group, Horseshoe
Canyon, and Hell Creek. This does seem to show that they weren't
there. On the other hand, if the Dinosaur Park Formation
therizinosaur frontal described by Currie in the 1980s IS a
therizinosaur, then those guys were hanging out in the Judith
River Group without leaving a tooth record (as far as has been
reported).>

  This is interesting in the fact that troodont teeth and
therizinosaur teeth are in fact quite similar to each other.
They both bear, for instance, basal constrictions, "leaf" or
"diamond" shaped heads, the short-axis cross-section is rhomboid
(diamond-shaped), the denticles curve towards the apex, and the
crown's apex, as in some troodont teeth, lack denticles. It is
possible therizinosaur teeth have been misidentified.
Therizinosaur teeth require some more comparative work, of
course.

  The skull material to *Beipiaosaurus* is therizinosaur, for
instance, and the Lufeng jaw is not, mostly because of the teeth
(there are other reasons). If you're lucky to come to Bozeman
this year, I will gladly explain this with pictures...

=====
Jaime A. Headden

  Aaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhr-gen-ti-na
  Where the Wind Comes Sweeping Down the Pampas!!!!

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