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Humerus of Mesodermochelys undulatus ウミガメ・メソダーモケリスの右上腕骨うみがめ・めそだーもけりすのじょうわんこつ

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中生代白亜紀後期カンパニアン（約8300万年〜7200万年前）前期の地層から発見された．上腕骨の大きさから甲羅は約1.5mと推定され，最大級のメソダーモケリスである．メソダーモケリスは現生オサガメの祖先と考えられている．

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Hokkaido Digital Museum

"Hokkaido Digital Museum," is a cross-search portal that aggregates information on facilities, materials, and artworks at museums and art galleries in Hokkaido

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Hokkaido governement opened to the public the "Hokkaido Digital Museum," a cross-search portal site that collects information on museums, materials, and artworks from various museums and art galleries in Hokkaido and make it available as one-stop

Last updated

July 14, 2026