Re: Tyrant horns (was Re: UTILITY OF CLADE NAMES_

[Dinogeorge <Dinogeorge@aol.com>]

In a message dated 98-04-28 08:36:38 EDT, th81@umail.umd.edu writes:

<< The type of T. bataar DOES have postorbital rugosities, the same as most
 (but not all) specimens of T. rex.  T. bataar and T. rex have very low
 lacrimal prominences and a distinctive posterior angulation of the lacrimal.
 
 I think the poster to the list is using "brow horns" for "postorbital
rugosity". >>

I had heard that the _T. rex_ brow horns are not just postorbital rugosities
but are separate ossifications--something I was hoping to have confirmed. Most
tyrannosaurines of more or less advanced adult age had postorbital rugosities;
such structures are probably not of phyletic significance. Some
tyrannosaurines also had low lacrimal horns, which might be of phyletic
significance.