SMU and Japanese paleontologists find second hadrosaurid species


This artist’s illustration of Yamatosaurus izanagii (center) represents its ancestry to more advanced hadrosaurs (in the background).  Artwork by Masato Hattori. (download image)
The right dentary of Yamatosaurus izanagii distinguishes it from other known hadrosaurs. It has just one functional tooth in several battery positions and no branched ridges on the chewing surfaces, suggesting that it evolved to devour different types of vegetation than other hadrosaurs. (download image)
This map of Japan shows the locations of Yamatosaurus izanagii on Awaji Island (green star) and Kamuysaurus in Mukawa Town (blue star). The locations of other hadrosaurids found on Awaji Island are marked with the red star. In the stratigraphic sections, the location of Yamatosaurus izanagii is marked with a green star and the location of Kamuysaurus is marked with a blue star. (download image)