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Re: Avaceratops and Ceratops (was Re: THE NEW ISH OF JVP)
Mickey Mortimer wrote:
First of all, does anyone know where Penkalski and Dodson place
Turanoceratops in their new paper? Above or below Avaceratops?
They don't put _Turanoceratops_ (nor _Zuni_) in their cladogram, but mention
both in passing. Both are probably basal ceratopsids.
This is only because they use the term "arctometatarsal" incorrectly. Note
that their description reads "proximally, however, the third metatarsal of
the Thai form is still visible in anterior view, as a thin sliver of bone
between the proximal ends of metatarsals II and IV". And indeed, the
illustrates this well- you can still see metatarsal III just fine between
and IV in both proximal and anterior views. Correct me if I'm wrong, but
isn't the arctometatarsalian condition that in which metatarsals II and IV
contact each other proximally? The Thai form is pretty close to
arctometatarsaly (as would be expected in an ancestor of truly
arctometatarsalian forms), but isn't quite there yet.
Yeah, you're right Mickey. In the Thai ornithomimosaur the proximal part of
Mt III is pinched but not completely blocked from view by II and IV.
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