[B-PT25] 地球生命史

[BPT25-P01] モンゴル国ゴビ砂漠上部白亜系産の巨大オビラプトロサウルス類（恐竜類：獣脚類）について

*對比地 孝亘¹、渡部 真人²、バルスボルド リンチェン³、ツォクトバートル キシグジャブ³ (1.東京大学理学系研究科地球惑星科学専攻、2.大阪市立大学理学部地球教室、3.モンゴル古生物学センター)

キーワード：モンゴル, ゴビ砂漠, オビラプトロサウルス類, 白亜紀, 恐竜

A large, isolated symphyseal region of fused contralateral dentaries belonging to a caenagnathid oviraptorosaurian was found in the lower Upper Cretaceous Bays Shire Formation cropping out at Tsagaan Teg in the Mongolian Gobi Desert. This specimen is comparable in size and morphology to the gigantic caenagnathid Gigantoraptor erlianensis known from the Iren Dabasu Formation in China, and may be closely related to the latter species. The occurrence of the specimen of a possible affinity with G. erlianensis in the Bays Shire Formation is consistent with the hypothesized correlation between the Bayn Shire and Iren Dabasu formations proposed based on vertebrate fossils, especially turtles.