Re: Bainoceratops & other basal neoceratopsians

["Alessandro Marisa" <iguanodontia@yahoo.it>]

----- Original Message -----
From: "Nick Gardner" <ratites637@hotmail.com>
To: <dinosaur@usc.edu>
Sent: Wednesday, May 28, 2003 11:27 PM
Subject: Re: Bainoceratops & other basal neoceratopsians


>To my knowledge, it is present in all coronosaurs, psittacosaurids,
>heterodontosaurids (albeit reduced?), _Liaoceratops_, _Udanoceratops_,
>_Archaeoceratops_, _Leptoceratops_, etc.

And also in Chaoyangsaurus in regard to Ceratopsia, but if I remember  the
"jugal thingy" is also present in some if not all Pachycephalosaurs, in view
of this I think that the presence of a "jugal thingy" could be a
synapomorphy of the Marginocephalia, in which Heterodontosaurids,
Chaoyangsaurus, and Pachycephalosaurs possess the primitive condition with
the absence of a dorsoventral crest, while Liaoceratops and all other
NeoCeratopsian possess the derived condition with the presence of that
crest. The presence of a "jugal thingy" in Zephyrosaurus and Orodromeus
could be explained as convergence.
Out of contest, please could someone tell me if the Bainoceratops's paper is
available as a "pdf" file?

By
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Alessandro Marisa
Via Achille Grandi n°18
38068 Rovereto (TN) ITALY
Email: iguanodontia@yahoo.it
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