A recent study challenges the depiction of predatory dinosaurs like Tyrannosaurus rex with exposed teeth, suggesting they had scaly, lizard-like lips instead. By examining tooth structure, wear patterns, and jaw morphology of reptile groups, researchers concluded that theropod mouth anatomy resemble
A juvenile Edmontosaurus disappears into the enormous, lipped mouth of Tyrannosaurus. Credit: Mark Wittonwith exposed teeth, suggesting they had scaly, lizard-like lips instead. By examining tooth structure, wear patterns, and jaw morphology of reptile groups, researchers concluded that theropod mouth anatomy resembles lizards more than crocodiles. The findings imply that many popular dinosaur depictions, including the iconic, are incorrect.
Study co-author Derek Larson, Collections Manager and Researcher in Palaeontology at the Royal BC Museum in Canada, said: “Palaeontologists often like to compare extinct animals to their closest living relatives, but in the case of dinosaurs, their closest relatives have been evolutionarily distinct for hundreds of millions of years and today are incredibly specialised.
“Curiously, there was never a dedicated study or discovery instigating this change and, to a large extent, it probably reflected preference for a new, ferocious-looking aesthetic rather than a shift in scientific thinking. We’re upending this popular depiction by covering their teeth with lizard-like lips.
“As any dentist will tell you, saliva is important for maintaining the health of your teeth. Teeth that are not covered by lips risk drying out and can be subject to more damage during feeding or fighting, as we see in crocodiles, but not in dinosaurs,” said co-author Kirstin Brink, Assistant Professor of Palaeontology at the University of Manitoba.
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