As the calendars show the year 2004, an oosaur remnant was discovered on a small island off the south coast of Japan. Hadrosaur (duck-billed ozor)
Studies on this fossil, which is determined to belong to the family, have continued until today. Today, it has been announced that the fossil belongs to a previously undiscovered species. New genre “ Yamatosaurus izanagii ”was given the name.
This discovery, which expands the family tree of the hardosaur family, discovered a species in the same family named Kamuysaurus in 2019. by the same team was performed. The previous fossil discovered with the last fossil is also the first to be discovered in Japan from the late Cretaceous period. This sheds light on which oosaurs lived in Japan at the end of the hard age.
An ozor that points to evolution from two-legged to four-legged:
There are some features that make the Yamatosaurus newcomer to the hardosaur family unique in the family. Yamatosaurus compared to other species a different tooth structure. Hardosaurs had hundreds of teeth they carried on their cheeks, replacing as they wore or fell. The number and development of teeth in Yamatosaurus differ noticeably. Your genre therefore compared to other genres feeding on different plant species under consideration.
- Illustration of Yamatosaurus
In addition, scientists have evolution from two-legged to four-legged made another discovery that sheds light. on the shoulders and forelimbs of the hard an unexpected development ‘. This unexpected development also pointed out that the ozor was in an evolutionary process. The new species of the Hardosaur family, which was abundantly found in the Cretaceous period, thus created a new question mark in the scientific world.
As for how oosaurs migrated between two continents, scientists say that hardosaurs are from Asia (Japan belonged to Asia 15 million years ago) to present-day Alaska. Bering land bridge that it may have spread over almost the whole of North America.