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[Fwd: Plastosicus information - Dimorphism in Hypsilophodon]



forwarded from vrtpaleo@usc.edu
please do not email ME when you respond
   From:         "Alessandro Marisa" <amaris@tin.it>

Alessandro Marisa wrote:
> Two weak leater my friend Marco Auditore, a Dinosaur fun from Italy send me
> a copy of an article pubblished in "Prehistoric Times n025/August-September
> 1997". In this articles there is some reconstruction of the skull of various
> Theropoda Dinosaurs of Mike Milbourne, one of this is an animal named
> Plastosicus. Marco send me that he think that Plastosicus is an
> Abelisauridae.
> I have send this reconstruction of the skull a T. Mike Keesey for more
> information and he send me that this animal can't be a true Abelisauridae,
> since it lacks the bone (jugal bar) from the posterior part of the orbit
> that projects forward in Abelisauridae and sort of separates the upper part
> of the orbit (with the eye) from the lower part. The teeth are enormous very
> NeoCeratosauria. The nares are odd. Mike Keesey think that it is somewhere
> between Ceratosaurus and Abelisaurus.
> My question is:
> Does someone tell me some information or clarification about this animal?
> There is an Email address of Mike Milbourne?
> P.S.
> I can send the reconstruction of the skull.
> ----------------------------------------------------------------------------
> ----------------------------------------------
> I have read in "The Dinosauria" that a dimorphism in the structure of the
> sacrum has been reported by Galton.
> Some specimens have 16 dorsal and 5 sacral vertebrae, but the centrum of the
> last dorsal is expanded caudally and forms extensive sutural contacts with
> the first sacral ribs.
> By contrast, certain other individuals have 15 dorsal and 6 sacral
> vertebrae; the first vertebra is a sacral because its rib is sutured to both
> centrum and neural arch and contact the pubis peduncles of the ilia.
> There is some possibility that there is a sexual dimorphism, or there is
> only the differences between an immature specimens and an adult?
> 
> Thanks you in advance and sorry for the English
> Alessandro Marisa
> Via A. Grandi n018 ROVERETO (TN) ITALY
> Tel: 039-0464-434658 Email: amaris@tin.it