RE: Tyrannosaur growth and babies

["Stewart, Dwight" <Dwight.Stewart@VLSI.com>]

> -----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