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Re: Stego Throat Armor?



Although, as every dinosaur knows, the fronds do have marvelous laxative
powers, Hence the common dinosaur saying, "With fronds like these, who needs
enemas?"
Scott
----- Original Message ----- 
From: <mariusromanus@aol.com>
To: <dinosaur@usc.edu>
Sent: Thursday, September 20, 2007 1:58 AM
Subject: Re: Stego Throat Armor?


> Yeah... I have to agree with Mike.  I've always envisioned stegosaurs
> having those throat osteoderms to protect the underside of the neck
> while sticking their head into pointy cycads and such. Who knows...
> maybe these guys had a taste, not for the fronds themselves, but for
> the chewy center.. sticking their heads in past the spear-tipped crown
> and using their beaks to tear into the caudex, uproot them for the
> roots, munch on the tender suckers, etc. I'm no botanist, but I think
> there's more nutritional value in the caudex and roots than in the
> fronds.
>
> Kris
> Saurierlagen@gmail.com
>
>
> -----Original Message-----
> From: Graydon <oak@uniserve.com>
> To: Dinosaur Mailing List <dinosaur@usc.edu>
> Sent: Wed, Sep 19  9:09 PM
> Subject: Re: Stego Throat Armor?
>
> On Wed, Sep 19, 2007 at 12:39:39PM -0700, T. Michael Keesey scripsit:
> > On 9/19/07, George Blasing <dinoworld@msn.com> wrote:
> > > Why would Stegosaurus, a dinosaur with its head held so low to the
> ground,
> > > have dermal armor on the underside of its throat? Were there
> predators,
> > > "crocodiles maybe?", that could actually attack it in that spot?
> The big
> > > predators, like Allosaurus and Ceratosaurus, would have grabbed it
> from
> > > above at the top of the back of the neck, right? Why have armor in
> a spot
> > > that can't be reached anyway?
> >
> > Maybe it wasn't for its predators, but for its "prey". Many
> > Jurassic-type plants tend to have a high spikiness factor.
>
> Or it had to worry about being attacked while in a tripodal feeding
> stance.
>
> Or it had to worry about being attached from the front -- even
> a very stupid theropod would want to stay away from the thagomizer --
> and being kicked, rather than bit.
>
> Or the dermal armour is a display structure and was all sorts of vivid
> colours in life, and there was rearing involved in the display.
>
> There ought to be enough general selection pressure against the
> expensive practise of growing extra bones that I'd think the assumption
> would be 'this had a purpose'.
>
> -- Graydon
>
>
>
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