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Re: Cheekless and lipless dinosaurs...

In a message dated 10/2/98 0:38:27 AM EST, veselinka.stanisavac@siol.net

<< True for the movable jaws. However it doesn't necessarily mean they needed
mammalian herbivore cheeks to do the job. Just shortening the lip-mouth line
would help them keep their food inside their mouth. Recent herbivorous lizards
are doing just fine in chewing and digesting their plant food and there is a
lot of similarity between the jaws and teeth of say hypsilophodonts and
iguanas.  >>

This is why I said "some kind" of cheeks. Naturally, these would not have been
mammalian cheeks(!), but although of different morphology, they would have
served much the same purpose. The tooth rows of all ornithopods, and indeed,
most ornithischians, not to mention segnosaurs and a few prosauropods, are
inset from the outer edges of the jaws, and that space must have been taken up
by something.