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Re: News story: Did We Get Dinosaurs' Noses Wrong?
From: "Michael Hanson" <email@example.com>
What!!!! No lips?!?!?!? Or even a fleshy
Just because lizards have lips and crocodiles don't doesn't mean >dinosaurs
did not have lips!!!
I would imagine that phylogenetic bracketing would indicate otherwise. But
It seems that dinosaurs have small holes in the bottom and outside
>surfaces of their maxillary bones and pre-maxillary bones as well as >the
tops and outside surfaces of their lower jaw and that these holes >had
blood vessels running through them.
Yup. And Bakker argues that these foramina must have been used to feed
nutrients to the dinosaurian lips. This is not true. Why?
Firstly, the foramina of the dentary would have been completely covered by
the upper teeth, and according to HP Ford's paper, are too high on the
dentary to be of any use to the lips. As Ford points out, these foramina
are used in lizards to feed the labial glands and the superior alveolar
nerve and maxillary artery. What's more, it is believed that Bakker's "lip
holes" actually served to supply veins and nerve tracks to the teeth, which
helped with the growth of the teeth and helped the gums while the teeth were
If there were blood vessels running through these holes, then there >would
be some kind of fleshy covering over the teeth!
I think I should point out here that the maxillary teeth of the _T. rex_
known as "Stan" were so large that the so-called lips of the lower jaw would
have had to have wrapped under and over the upper teeth - something
fantastical, if you ask me.
Dinosaurs HAD LIPS!!!!!!!!!!!!!!!
Respectfully: nope! :)
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