Re: Bainoceratops & other basal neoceratopsians

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

----- Original Message -----
From: "Tim Williams" <twilliams_alpha@hotmail.com>
To: <dinosaur@usc.edu>
Sent: Wednesday, May 28, 2003 5:59 PM
Subject: Re: Bainoceratops & other basal neoceratopsians

>> Dinogeorge@aol.com wrote:
> >I think you can find the "jugal thingy" in most marginocephalians and
even
> >in
> >heterodontosaurians (one of the reasons I took heteros out of
Ornithopoda).

> Some true ornithopods have the "jugal thingy" too.  The hypsilophodontids
> _Zephyrosaurus_ and _Orodromeus_ share an enlarged jugal boss.

If I remember correctly and if the "jugal thingy" is the same as the "jugal
boss" present in all Ceratopsia (apart Chaoyangsaurus) are quite different
from that present in Zephyrosaurus and Orodromeus infact in Ceratopsia the
"jugal thingy" present a dorsoventral crest on the lateral surface of the
jugal, this crest divides the lateral aspect of the jugal into rostral and
caudal surfaces. This crest seem to be absent in the "jugal thingy" of
Hypsilophodontids.

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