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A new basal hadrosaurid (Dinosauria : Ornithischia) from the latest Cretaceous Kita-ama Formation in Japan implies the origin of hadrosaurids
| Title: | A new basal hadrosaurid (Dinosauria : Ornithischia) from the latest Cretaceous Kita-ama Formation in Japan implies the origin of hadrosaurids |
| Authors: | Kobayashi, Yoshitsugu Browse this author →KAKEN DB | | Takasaki, Ryuji Browse this author | | Kubota, Katsuhiro Browse this author | | Fiorillo, Anthony R. Browse this author |
| Issue Date: | 27-Apr-2021 |
| Publisher: | Nature Research |
| Journal Title: | Scientific reports |
| Volume: | 11 |
| Issue: | 1 |
| Start Page: | 8547 |
| Publisher DOI: | 10.1038/s41598-021-87719-5 |
| Abstract: | Here we describe a partial hadrosaurid skeleton from the marine Maastrichtian Kita-ama Formation in Japan as a new taxon, Yamatosaurus izanagii gen. et sp. nov., based on unique characters in the dentition. Our phylogenetic analysis demonstrates Yamatosaurus izanagii belongs to Hadrosauridae, composed of Hadrosaurus foulkii + (Yamatosaurus izanagii + (Saurolophinae + Lambeosaurinae)). The coracoid lacks a biceps tubercle as in non-hadrosaurid hadrosauroids, suggesting its presence is a key feature for the clade of Saurolophinae and Lambeosaurinae. The evolutionary rates analysis further supports that shoulder and forelimb features, which are likely to have been involved in locomotion, were important for the early evolution of Hadrosauridae. Our biogeographic analyses show that basal hadrosaurids were widely distributed in Asia and Appalachia, that the clade of Saurolophinae and Lambeosaurinae originated in Asia, and that eastern Asia may have served as a refugium of relict hadrosauroid taxa such as Plesiohadros djadokhtaensis, Tanius sinensis, and Yamatosaurus izanagii during the Late Cretaceous. The contemporaneous occurrence of basal (Yamatosaurus izanagii) and derived (Kamuysaurus japonicus) hadrosaurids during the Maastrichtian in Japan is the first record in Asia. Because of the long geographical distance between these localities, they likely did not co-exist, but instead demonstrate some level of provinciality. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/81726 |
| Appears in Collections: | 総合博物館 (The Hokkaido University Museum) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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