WASHINGTON — They probably did not smile, frown or snarl, but T. rex and its relatives almost certainly had the dinosaur equivalent of lips – a new finding by…
These dino lips would have been a scaly counterpart to the kind with which people pucker up. They also would not technically be called lips, but rather “labial scales.”
“Living monitor lizards like Komodo dragons are perfect living analogs – flesh-eating active predators with surprisingly similar teeth to that of dinosaurs,” said paleontologist and study co-author Robert Reisz of the University of Toronto Mississauga.
An examination of the relationship between tooth size and skull size undercut the idea that large theropods simply had teeth too big to be covered by lips. The study identified large lizard species with lips alive today that possess teeth proportionally bigger than T. rex, relative to skull size. Finally, an examination of theropod skulls found evidence of small pits along the upper jaws that house nerves and blood vessels to supply lips and gums, structures lacking in crocs.
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