Fossils
Online ISSN : 2424-2632
Print ISSN : 0022-9202
ISSN-L : 0022-9202
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Volume 113
Displaying 1-9 of 9 articles from this issue
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  • A plesiosaur (Reptilia: Sauropterygia) from the Upper Cretaceous (Campanian) Izumi Group of Higashi Kagawa City, Kagawa Prefecture, South Western Japan
    Daisuke Nakatani, Hideo Nakaya
    2023 Volume 113 Pages 5-16
    Published: March 31, 2023
    Released on J-STAGE: April 14, 2023
    DOIhttps://doi.org/10.14825/kaseki.113.0_5
    JOURNAL FREE ACCESS
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    Plesiosaur fossils are only scarcely known from the Upper Cretaceous of southwestern Japan. Here, we describe a plesiosaur fossil from the Upper Cretaceous Izumi Group of Kagawa Prefecture, southwestern Japan. The fossil is identified as the diaphysis of a left propodeal, and it belongs to an adult individual because the tuberosity or trochanter is differentiated from the capitulum (sense Brown, 1981). The preaxial margin is concave, and the tuberosity or trochanter is narrow and posteriorly located in dorsal view. This combination is observed in some specimens of the Elasmosauridae and Leptocleidia, but preservation of the described propodial is insufficient to identify even at the family level. Therefore, the specimen is identified as an indeterminate Xenopsaria, which is a clade that include the Elasmosauridae and Leptocleidia. Although fragmentary, the specimen is an important record as the first confirmed adult individual of a plesiosaur recorded in this area.
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