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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
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.
From: Allan Edels [SMTP:email@example.com]
Sent: Thursday, August 20, 1998 9:50 PM
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
presumed male specimen ("STAN") that shows an additional caudal
immediately behind the sacral vertebrae - as in crocodiles (the
chevron - used for penile retraction). He surmises that female _T.
will not have that chevron - not yet tested. There is also a paper
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).
From: Stewart, Dwight <Dwight.Stewart@VLSI.com>
To: 'firstname.lastname@example.org' <email@example.com>; firstname.lastname@example.org
Date: Wednesday, August 19, 1998 4:56 PM
Subject: RE: T rex brooding
>dimorphism an accepted fact in tyrannosaurs? I'm NOT disputing it,
>just wondering how much scientific evidence there is for it?