論文

基本情報

氏名 林 昭次
氏名(カナ) ハヤシ ショウジ
氏名(英語) Hayashi Shoji
所属 生物地球学部 恐竜学科
職名 准教授
researchmap研究者コード B000005431
researchmap機関 岡山理科大学

題名

A Hadrosauroid Vertebra from the Upper Cretaceous Izumi Group, Kagawa Prefecture, Japan

単著・共著の別

共著

著者

Shoji Hayashi ,  Yasuhisa Nakajima ,  Yoshihiro Tanaka ,  Benjamin T. Breeden ,  Yoshihiro Kanazawa ,  Chinzorig Tsogtbaatar

概要

Of the four main Japanese islands, Late Cretaceous dinosaur fossils have been discovered in Hokkaido, Honshu, and Kyushu. Here, we report the first Late Cretaceous dinosaur from the remaining main island Shikoku, an isolated dorsal vertebra from the upper Campanian Hiketa Formation (Izumi Group) in Sanuki, Kagawa Prefecture. The vertebra is incomplete, comprising a robust centrum with a subrectangular profile that is generally characteristic of dinosaurs. Histological examination of the centrum reveals moderately packed trabecular bone and the complete absence of pneumatic structures, which precludes referral of the specimen to Saurischia or Pterosauria. Instead, we interpret it as a hadrosauriform ornithischian based on the slightly expanded anterior articular surface of the centrum; heart-shaped outline of the intervertebral surface, resulting from its dorsally wide and ventrally narrow shape; ventral keel; and neural canal partially embedded into the centrum. As the ventral positioning of the neural canal is common to Bactrosaurus and higher taxa within Hadrosauriformes, we tentatively refer the specimen to Hadrosauroidea. This discovery provides additional evidence that hadrosauriforms had dispersed into present-day Japan by the Campanian and highlights the potential of the Hiketa Formation to provide additional evidence to improve our understanding of the dinosaur diversity at the extreme eastern continental margin of Eurasia.

発表雑誌等の名称

The Paleontological Society of Japan

出版者

The Paleontological Society of Japan

28

4

開始ページ

442

終了ページ

251

発行又は発表の年月

2024/07

査読の有無

有り

招待の有無

無し

記述言語

英語

掲載種別

研究論文(学術雑誌)

ISSN

ID:DOI

ID:NAID(CiNiiのID)

ID:PMID

URL

JGlobalID

arXiv ID

ORCIDのPut Code

DBLP ID