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Re: A Whole Bunch Of Questions
From: "Ivan Kwan" <firstname.lastname@example.org>
1) Sail or Muscle???
In _Suchomimus_, there seem to be some pretty tall neural spines on the
vertebrae above its hips... is there evidence for either a sail or for a
hump of muscles? It does seem interesting that most of us still prefer to
see our spinosaurs & ouranosaurs with sails instead of humps... what
evidence is there for these dinosaurs not to have humps? (I still prefer
mine with sails thank you.)
Same with _Acrocanthosaurus_... would it have a low sail along its neck &
back or just a huge bunch of muscles?
I was just discussing this very same topic with Jaime the other day...
As it turns out, neither are very big fans of the hump hypothesis. While
Jack Bailey makes a decent argument for muscular humps in tall-spined
dinosaurs, I'm not so sure he's all too convincing. Jaime pointed out that
the neural spines, for example, bare no muscle scars, that the distal ends
are not incrassate, etc.
I've also seen arguments that say _Spinosaurus_ could not have had a dorsal
hump, otherwise the weight of the hump would have forced the animal down
onto its front legs; the hands and wrists of which were not built for
4) Hadrosaur necks
I've noticed a few hadrosaur restorations where thelong thin neck is buried
under this thick neck just like that of a horse's. I've also seen this
trend in a few of Greg Paul's artwork and in the silhouettes of his
skeletal reconstructions. Personally, I think my hadrosaurs look better
with thin necks, but hey, what do I know? But anyway, does the evidence
point towards thin necks, thick ones, or somewhere in between. Does
Leonardo the _Brachylophosaurus_ tell us anything?
From what I've heard, Leonardo supports the idea of neck somewhere in
between the swan-like and horse-like reconstructions we're used to seeing.
5) Hadrosaur skin
I often notice that many restore hadrosaurs with a thin frill of skin along
their necks & backs. I've also seen an equal number of hadrosaur
restorations with a row of bumps or spines along the back. Do the hadrosaur
mummies or skin impressions point to either one being more plausible than
the other? I've always thought that a dorsal frill would be subject to much
damage through abrasion, sharp vegetation as well as failed predator
I think that "dorsal frill" you refer to has been attributed to an
_Edmontosaurus_ specimen. I'd be curious to know more about this, too.
While we're on hadrosaur skin, is there actually evidence that
_Parasaurolophus_ possessed a flap of skin that extended from the end of
its crest down along its neck or is it purely conjecture (& a stroke of
Still artistic licence, so far as I know.
Undergraduate Student, Carleton University
Vertebrate Paleontology & Paleoecology
AIM: jslice mallon
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