Ankylosaur Side-Body Spikes? (was TRex - Ankylosaur specialist?)

[Vlad Petnicki <bucketfoot-al@justice.com>]

Ken, if you would permit me a quick question for you -
I distinctly remember the very fine Ankylosaur mount at
the American Museum of Natural History in NYC (the
front half of the animal only) having side body spikes,
which is how all Ankylosaur reconstructions were
portrayed in the 1970s;

but all the recent reconstructions I have seen appear
to omit them - what's the story here?

On Thu, 1 Jun 2006 12:23:17 -0600, 

Ken.Carpenter@dmns.org wrote:

> 
> T rex probably ate any juvenile dumb enough to get
> within biting
> distance 
> 
> 
> Kenneth Carpenter, Ph.D.
> Curator of Lower Vertebrate Paleontology/
> Chief Preparator
> Department of Earth Sciences
> Denver Museum of Nature & Science
> 2001 Colorado Blvd.
> Denver, CO 80205
>  
> Phone: 303-370-6392
> Fax: 303-331-6492
> 
> for PDFs of some of my publications, as well as
> information of the Cedar
> Mountain Project: 
>
https://scientists.dmns.org/sites/kencarpenter/default.aspx
> ++++++++++++++++++
> 
> -----Original Message-----
> From: owner-DINOSAUR@usc.edu
> [mailto:owner-DINOSAUR@usc.edu] On Behalf
> Of bucketfoot-al@justice.com
> Sent: Thursday, June 01, 2006 12:21 PM
> To: Ken Carpenter
> Cc: dinosaur@usc.edu
> Subject: RE: T. rex as ankylosaur specialist
> 
> Actually Ken, if you consider my earlier comment that
> TRex would
> probably only go after juvenile Ankylosaurids, I think
> it would have
> been feasible for it to bite down on the neck/head
> while leveraging one
> foot on top of the Ankylosaurus (and necessary to keep
> the animal from
> thrashing out of the grip of the TRex
> Jaws.)
> 
> No TRex in its right mind would go after a full-grown
> Ankylosaurid, I
> agree completely on that.  The adults would probably
> have been close to
> impervious to attack, and you correclty point out one
> of the reasons why
> the 'frontal attack' on an adult Ankylosaur would not
> have been likely
> to succeed....
> 
> On Thu, 1 Jun 2006 12:15:42 -0600,
> Ken.Carpenter@dmns.org wrote:
> 
> > 
> > Sorry, no, it does not make sense. Both Edmontonia
> and Ankylosaurus 
> > (Hell Creek and Lance Fms) were too tall and massive
> for a T rex to 
> > hold down with one foot.
> > 
> > 
> > Kenneth Carpenter, Ph.D.
> > Curator of Lower Vertebrate Paleontology/
> > Chief Preparator
> > Department of Earth Sciences
> > Denver Museum of Nature & Science
> > 2001 Colorado Blvd.
> > Denver, CO 80205
> >  
> > Phone: 303-370-6392
> > Fax: 303-331-6492
> > 
> > for PDFs of some of my publications, as well as
> > information of the Cedar
> > Mountain Project: 
> >
>
https://scientists.dmns.org/sites/kencarpenter/default.aspx
> > ++++++++++++++++++
> > 
> > -----Original Message-----
> > From: owner-DINOSAUR@usc.edu
> > [mailto:owner-DINOSAUR@usc.edu] On Behalf
> > Of bucketfoot-al@justice.com
> > Sent: Thursday, June 01, 2006 12:13 PM
> > To: Jerzy.Dyczkowski@unibas.ch
> > Cc: dinosaur@usc.edu
> > Subject: RE: T. rex as ankylosaur specialist
> > 
> > Good point.  However I still think hat my head/neck
> > bite hypothesis
> > makes more sense...because as it bit down on the
> > neck/head of the
> > Ankylosaur the TRex could have placed one foot on
top
> > of the
> > Ankylosaur's back, pushing it down to immobilize it
> > under its own weight
> > and allowing the TRex to get a more secure death
grip,
> > which it could
> > hold til the animal died...does this makes sense to
> the
> > palaeontologists
> > out there?
> > 
> > On Thu,  1 Jun 2006 20:02:53 +0200,
> > Jerzy.Dyczkowski@unibas.ch wrote:
> > 
> > > 
> > > Quoting bucketfoot-al@justice.com:
> > > 
> > > > Well, I suppose TRex might have been able to
> 'flip'
> > a
> > > > small Ankylosaur, but a full-grown one would
have
> > been
> > > > impossible to flip given the respective centres
of
> > gravity and body 
> > > > mass
> > > 
> > > I thought that ankylosaurids were not flipped
> > completely upside down, 
> > > but just bent enough to expose sides and legs
from a
> > killing bite. 
> > > Armor of some ankylosaurids has a frill of spikes
> > pointing sideways, 
> > > clearly protecting lower body from bite from
above.
> > > 
> > > Jerzy Dyczkowski
> > > 
> > > 
> > > 
> > > 
> > > 
> > >
> >
>
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