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RE: T rex brooding

Thank you, Allan. :-).  It makes one wonder if tyrannosaurs might have had a
life style anything like modern predators with definite dimorphism, such as
the hyena?  

On the subject of huge, predatory dinosaurs: a fellow "dinophyle" here
recently mentioned a "mount" of a giganotosaurus somewhere here in the
states.  Perhaps Philadelphia? I wasn't aware that sufficient specimens had
been recovered for anything like a reasonable mount of this animal.


        -----Original Message-----
        From:   Allan Edels [SMTP:edels@email.msn.com]
        Sent:   Thursday, August 20, 1998 9:50 PM
        To:     dinosaur@usc.edu
        Subject:        Re: T rex brooding


            I don't know if dimorphism is an *accepted* fact in
        However, I have been working my way thru the 1996 DinoFest
        publication (printed this year for DinoFest here in Phila.).  Neal
        (BHI) has a paper which lists all the _T. rex_ specimens (21 at the
        and he sees definite sexual dimorphism.  There are robust specimens
        relatively smooth skulls (those that have skulls) - these are
        female.  Males are presumed gracile and have rugose skulls.  And he
has one
        presumed male specimen ("STAN") that shows an additional caudal
        immediately behind the sacral vertebrae - as in crocodiles (the
first caudal
        chevron - used for penile retraction).  He surmises that female _T.
        will not have that chevron - not yet tested.  There is also a paper
by Ralph
        Chapman, Dave Weishampel, Gene Hunt, and Diego Rasskin-Gutman that
        summarizes Neal's findings on _T. rex_ and others' on other
        ("Sexual Dimorphism in Dinosaurs" - I looked it up).

            Allan Edels

        -----Original Message-----
        From: Stewart, Dwight <Dwight.Stewart@VLSI.com>
        To: 'edels@email.msn.com' <edels@email.msn.com>; dinosaur@usc.edu
        Date: Wednesday, August 19, 1998 4:56 PM
        Subject: RE: T rex brooding

        >dimorphism an accepted fact in tyrannosaurs?  I'm NOT disputing it,
I was
        >just wondering how much scientific evidence there is for it?
        > Dwight