878. UPPER CRETACEOUS ELASMOSAURID (REPTILIA, PLESIOSAURIA) FROM HOBETSU, HOKKAIDO, NORTHERN JAPAN

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  • 878. 北海道, 穂別町の上部白亜系より産出したエラスモサウルス科(爬虫類, 鰭竜目, 長頸竜亜目)化石
  • 北海道,穂別町の上部白亜系より産出したエラスモサウルス科(爬虫類,鰭竜目,長頚竜亜目)化石〔英文〕
  • ホッカイドウ ホベツチョウ ノ ジョウブ ハクアケイ ヨリ サンシュツシタ エ

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Description

An elasmosaurian fossil is described from the Upper Yezo Group exposed along the Sanushube River, Hobetsu-cho, Hokkaido, northern Japan. Other fossils associated with the elasmosaurian specimen indicate an early Campanian age (Late Cretaceous). The specimen is represented by a partial skeleton of the trunk and parts of limb bones. The specimen exhibits a characteristic morphology of the family Elasmosauridae (Reptilia, Plesiosauria, Plesiosauroidea), but its generic and specific positions are indeterminable. The distribution pattern of the known Jurassic and Cretaceous plesiosaurians suggests that the Cretaceous Plesiosauria of northeastern Asia is a migrant from North America through the North Pacific region.

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