“We call this kind of scar a belly button, and it is smaller in humans. This specimen is the first dinosaur fossil to preserve a belly button, which is due to its exceptional state of preservation,” said Michael Pittman, one of the study’s authors and a palaeontologists from the Chinese University of Hong Kong.
The size, smoothness and location of the umbilical scar rule out trauma or infection as the cause, the study says. The abdominal scale’s pattern was uninterrupted, whereas a healed injury would have a “smooth, scale-free connective tissue over the open wound,” the authors note.Article content Psittacosaurus was a two-metre long beaked herbivore that lived in the early Cretaceous. The fossil used in this study was made public in 2002 and has led to big discoveries because of its exceptionally preserved state, complete with scales, horn and “long plumes of tail bristles,” the researchers write.
“This Psittacosaurus specimen is probably the most important fossil we have for studying dinosaur skin. But it continues to yield surprises that we can bring to life with new technology like laser imaging,” the study’s lead author Phil R. Bell from the University of New England in Armidale in Australia toldThe palaeontologists compared the length of the specimen’s femur to other Psittacosaurus to estimate its age as just shy of sexual maturity, about 6 or 7 years old.
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