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Re: Cretaceous Echinodon & Jeholosaurus



Ken Kinman (kinman@hotmail.com) wrote:

<My impression was that Echinodon is now considered more derived than
Agilisaurus, but not as derived as Heterodontosaurids.>

  *Echinodon* has several features of the jaws that suggest
relationship to heterodontosaurs, including the form of the teeth
(some anterior canine-like teeth in the maxilla) and primary ridge
(strong). Other features of the teeth (radial denticle arrangement,
distinct neck to the crowns) suggest that *Echinodon* is not a
heterodontosaurid, or close to them, in spite of the anterior
maxillary fangs (no dentary fangs, and no ornithischian except basal
ornithopods and the more basal ornithischians like *Scelidosaurus*
and *Lesothosaurus* have anterior maxillary fangs to this degree) ...
suggesting, as it had been so long ago, that *Echinodon* was a basal
ornithischians, possibly a basal genasaurian, or a basal
thyreophoran.


=====
Jaime A. Headden

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

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