Previously Unknown Hadrosaurus Discovered

Y. Kobayashi et al., 2019 / Scientific Reports

Hadrosaurs, or duckbill dinosaurs ( Hadrosauridae ), are a dinosaur family that existed in the Cretaceous. These dinosaurs were herbivores, moving on two or four legs, while many of the family had a bone crest on their heads.

In a new study, scientists describe a previously unknown genus and species of dinosaurs - according to the skeleton found in Japan. This species lived approximately 72 million years ago; the specimen described by scientists was about eight meters long and weighed up to about 5.3 tons. According to scientists, the dinosaur either did not have a comb on its head, or it was very small (in connection with this, the dinosaur was assigned to the hadrosaurus subfamily - scientists just distinguish hadrosaurs that did not have a comb in this subfamily). A new genus and species was called Kamuysaurus japonicus (translated - "divine pangolin from Japan").

Y. Kobayashi et al., 2019 / Scientific Reports

Researchers note that Kamuysaurus japonicus is similar to the Laiyangosaurus hadrosaurs found in China and the Kerberosaurus found in Russia, and that it belongs to the Edmontosaurini clade (this genus includes, among others, two genera, one of which was found in Canada, the other - in Alaska). According to the researchers, Kamuysaurus japonicus and the hadrosaurs close to it probably traveled from North America to Asia via Alaska.

The work devoted to the new study was published in the journal Scientific Reports .

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