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Re: Tyrannosaur growth and babies



Here comes MY 2 cents:

    Having read Peter Larsen's paper in the DinoFest Symposium book
(published 1998), he indicates that the 'extra' chevron in the male (gracile
morph) may have been used for penile extraction, as some crocodillians do.

    I understand that there are also differences in some aspects of the
skulls - the gracile (presumed male) skull has ridges, and other bumps and
small projections on the top of the skull.  The robust (presumed female)
skull is smoother, slightly shorter, somewhat more rounded than the male
morph.

    According to earlier posts by Tom Holtz, the NYC mount, and the copy
here in Phila., use the body and skull of the gracile morph, and the legs
and hips of the robust morph (not to mention most of the tail vertabrae are
actually from and _Allosaurus_).  {Maybe it's  the first instance of
transexuallism :-)) }.

    Allan Edels

-----Original Message-----
From: Stewart, Dwight <Dwight.Stewart@VLSI.com>
To: 'DINOBOY@worldnet.att.net' <DINOBOY@worldnet.att.net>; Stewart, Dwight
<Dwight.Stewart@VLSI.com>
Cc: Kari_Baker@ndsu.nodak.edu <Kari_Baker@ndsu.nodak.edu>;
brandonc@advant.com <brandonc@advant.com>
Date: Tuesday, December 08, 1998 10:21 PM
Subject: RE: Tyrannosaur growth and babies


>
>
>> -----Original Message-----
>> From: TRUETT GARNER [SMTP:DINOBOY@worldnet.att.net]
>> Sent: Tuesday, December 08, 1998 10:27 PM
>> To: Dwight.Stewart@VLSI.com; 'Thomas R. Holtz, Jr.'; dinosaur@usc.edu
>> Cc: Stewart, Dwight; Kari_Baker@ndsu.nodak.edu; brandonc@advant.com
>> Subject: Re: Tyrannosaur growth and babies
>>
>>
>> Dwight wrote  , on Dec. 8
>> >
>> > Thanks.  This made me think of  another question. :-)  How strong is
>> > the evidence for dimorphism in
> [Stewart, Dwight]  #############################
> Truett answered, on Dec.8
>>
>> Dwight ,
>> In  ' Dinosaur  Systematics ' (Currie & Carpenter , 1990 ) there's a
>> section on variation among T.rex specimens . All the examples show a
>> degree
>> of variation from one another  , with the gracile morph exhibiting more
>> defined lachrymal / postorbital structures . This being indicative of a
>> male T.trex . Additionally , in ' Hunting Dinosaurs ' (Psihoyos &
Knoebber
>> , 1994) , Pete Larson  elaborates on some research performed on
crocodiles
>> , by Eberhart Freye . Larson found that sexual differences in crocs'
>> caudal
>> vertebrae were similar to what is found in the two T.rex morphs . The
>> gracile morph ( male) has the first (and more robust ) chevron located
>> one vertebrae forward of the same chevron in the robust morph .
Presumably
>> , this condition in the robust morph would allow more space for eggs to
>> pass between the tail and the ischia . My $0.02 worth. Next!
>> Hope this helps.
>> Regards ,
>> Truett Garner
> [Stewart, Dwight]  ##############################################
>
> Thank you, Truett.  YES - it does.  To me this would tend to
>indicate a potential
> for "social interaction" among Tyrannosaurs that might fit more of a
>hyiena model
> than an African lion model.
>
> Dwight
>