著者

Shikama Tokio Kamei Tadao Murata Masafumi

出版者

Tohoku University

雑誌

The science reports of the Tohoku University. Second series, Geology = 東北大学理科報告. 地質学 (ISSN:0082464X)

巻号頁・発行日

vol.48, no.1/2, pp.77-A42, 1978-03-29

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A new Early Triassic ichthyosaurus, Utatsusaurus hataii gen. et sp. nov., is described. The materials were collected from the upper part of the Osawa Formation on the coast at Tatezaki, the Kitakami Massif, Northeast Japan which is correlative of the Prohungaritan-Columbitan ammonoid stages of Spath (1930, 1934). The present form is of the most primitive type of Ichthyosauria from the view point of specialization of the pectoral limb.