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aside from the recent study which concluded that all dinosaurs are lipless
and cheekless (whitmer, i believe...?), have their been any serious studies
and investigations into the the presence or absence of cheeks in
ornithischians, other than highly derived ornithopods (by dr david norman)?
i've seen czerkas concluded that stegosaurus did not have cheeks, but rather
a turtle-like beak extending the length of the muzzle, though i don't know
what evidence he based this on.
a cast of panoplosaurus' skull on larry whitmer's homepage shows the
presence of some kind of plate covering one side of the mouth (i don't know
if the other has been removed for comparison or just wasn't found). does
this structure give any weight to the argument for or against the presence
of some kind of cheek structure? maybe h.p. tracy ford can come out of
lurker mode and offer his insight? (i've seen his ankylosaur restorations on
pachycephalosaurs seem to be unique in that there is a very sharp,
discernable ridge on their face around the dentaries. has this ridge been
looked into in the case of dinosaur cheeks? the texture of pachycephalosaur
faces seems to suggest that it was supported a layer of keratin over the
bumps and hornlets, or at least tightly fixed skin a la crocodiles. it is
confusing trying to reconcile this with the possibility of fleshy cheeks,
but perhaps that's exactly what the ridges supported. of course, i probably
have no idea what i'm talking about here.
i want to be more informed on this subject, especially as an artist. thanks.
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