OREANDA-NEWS Scientists came to this conclusion in a study published in Scientific Reports. Scientists called the dinosaur Kamuysaurus japonicus. Its partial tail was first discovered in the deposits of the outer shelf in the Khobetsu area. Further excavations uncovered an almost complete skeleton, which is the largest dinosaur skeleton ever found in Japan. It was named Mukavaryu in honor of the excavation site.

A group of researchers led by Professor Yoshitsugu Kobayashi from the Museum of Hokkaido University conducted a comparative and phylogenetic analysis of 350 bones and 70 taxa of adrosaurides. Such work led to the discovery: the dinosaur belongs to the Edmontosaurus and is closely associated with the Kerberosaurus, discovered in Russia, and the Layangosaurus, found in China. According to the team's histological study, the dinosaur was an adult aged 9 years or older. Its length is 8 meters, and this giant weighed 4 tons or 5.3 tons. Weight depended on whether he walked on two or four legs.

The study also shed light on the origin of the genus Edmontosaurini and how it could migrate. His last common ancestors spread widely throughout Asia and North America. The results of the analysis conducted by the research group indicate the possibility that the ancestors of the adrosaurides and their subfamilies preferred to inhabit areas near the ocean. This suggests that the coastal environment was an important factor in the diversification of adrosaurides in the early stages of their evolution, especially in North America.

Hadrosaurus was first described in 1858 from headless skeleton fragments from North America, found 20 years before the word "dinosaur"appeared. Hadrosaur fossils are now known on all continents except Australia. The remains are found mainly in North America, Asia, less often-in Europe. More than 40 species have been found. In Russia hadrosaurs were found on the territory of modern Belgorod and Amur regions, on Sakhalin. The largest location of hadrosaurs in Russia is Kundur.

The first Russian hadrosaurs were manjunatha. His bones were collected by the expedition of the Geological Committee of Russia, held in 1916 and 1917. It was the first expedition in Asia to search for dinosaurs. Now the field belongs to China and is known as Longwang — "Mountain bones of the Dragon."