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On Sat, 10 Jun 1995, James Shields wrote:
> >Does anyone know how the stegosaur plates are arranged? Is it paired,
> >alternating or flapped outward or possibly double rowed? I think
> >that they are alternating but can be flapped outward by muscles in
> >it's skin.
> The honest answer is "No, nobody does for certain."
> The problem is that the plates were held on to the bone by muscle and
> cartilege. When these rotted away, the plates just fell away. There doesn't
> seem to be a lot of agreement about exactly how they were attached (other
> than they were attached to the spine).
> I think we have a better picture of "Spiky" stegosaurs such as Kentrosaurus.
> All the reconstructions I've seen show two rows of spikes (does anyone know
> the reason for this? Are the spines more firmly attached). This is possibly
> the reasonigy behind reconstructions of Stegosaurus with two rows of plates.
> Personally I kind of favour the single row, just because it looks better
> (very scientific, eh?).
> James Shields - email@example.com - http://www.iol.ie/~jshields
> And when the ark was finished Noah said unto Elvis, "What do you reckin?"
> And Elvis checked out his own cabin and shook his head saying "poky".
> And so did they knock several walls through and install a jaccuzzi.
> And when it was all done Noah scratched his beard and said, "We don't have
> room for all the animals now."
> And Elvis perused the livestock list and in his wisdom said, "Lose the
> -Robert Rankin, The Suburban Book of the Dead
We _do_ know the arrangement of _Stegosaurus_ plates, for sure,
now! Tahnks to the 85% complete specimen we of the Denver Museum found
in '92, articulated with the plates in the correct positions, we know
that _Stegosaurus_ had two rows of alternating plates. The plates in the
new specimen partially overlap: if there were two parallel rows, they'd
entirely overlap, and if there was only one row, they would only barely
or not at all overlap. Second, there is a great deal of matrix between
the plates in the new specimen, indicating that in life they were
separated by a span of space. If the animal had only one alternating
row, the plates would overlap only slightly, and not have such a space
between them. Thus, the only solution left is that they had two
Apologies to all others on messages to which I haven't responded;
my modem was recently "zotted" by lightning, and is being repaired! I'm
on another, yucky (!) non-SLIP/PPP terminal at the moment. Be back in a
couple of days!
Jerry D. Harris
Denver Museum of Natural History