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RE: SVPCA 2000, part 1




ORNITHISCHIANS

David Norman: A new dinosaur from Transylvania.

A new genus has been recovered from material previously assigned to
_Rhabdodon_. Most of the postcrania seems to be of
dryosaurid/camptosaurid grade but the skull is distinctive: this is an
ornithopod trying to be a ceratopian (sort of). Posterior part of skull is
rather flattened dorsoventrally, there is a distinctive step in the lateral
side of the predentary as there is in dryosaurids. Ischium lacks an
obturator process, which is strange. On the cladogram the new taxon
fits between _Tenontosaurus_ and Dryosauridae. Intriguingly, the
cladogram Dr. Norman presented is pretty much a contradiction of
everything he's been saying for the last few decades: Iguanodontidae
was paraphyletic and _Tenontosaurus_ (which was monophyletic) was
closer to higher iguanodontians than to _Hypsilophodon_.
_Iguanodon_ (atherfieldensis + bernissartensis) was a clade and
_Altirhinus_ and _Eolambia_ grouped together. The new name
Thescelosauria was used for (_Thescelosaurus_ + _Bugenasaura_) +
Hypsilophodontia. Hypsilophodontia = _Hyp._ + _Tenontosaurus_ +
new taxon + Dryomorpha (Norman did not, and generally does not, use
latter name).


Would this be the skull that Dave Weishampel, et al (I think) had in his
National Geographic Research Article? Glad to see it finally described (or
will be soon).
Tracy