巨大なオルニトミモサウル (Deinocheirus mirificus) の長年の謎を解明する
Yuong-Nam Lee1, Rinchen Barsbold2, Philip J Currie3
1Geological Museum, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, South Korea.
Nature
|October 23, 2014
まとめ
新しい化石は,大きなオルニトミモサウル恐竜であるDeinocheirus mirificusが,重体型のメガオムニボアであったことを明らかにしています. この発見は,その神秘的な系統遺伝的地位を解決し,そのユニークな解剖学と生態学への洞察を提供します.
科学分野:
- パレオントロジー・パレオントロジー
- 脊椎動物の古生物学について
- 恐竜族 (Dinosauria) とは
背景:
- 断片的な遺骸から知られているDeinocheirus mirificusは,その異常な前肢の形態学と不確実な系統遺伝的配置のために謎めいたものでした.
- オルニトミモサウルとオルニトミモサウル以外の特徴を混ぜたホロタイプは,何十年もの間,その分類を複雑にした.
研究 の 目的:
- Deinocheirus mirificusの新種を記述し,重要な解剖学的情報を提供する.
- オーニソミモサウリア内のDeinocheirusの系統遺伝的地位を解明する.
- Deinocheirusの古生物学と生活様式を再構築する.
主な方法:
- モンゴルから新たに発見された2つの標本 (MPC-D 100/127とMPC-D 100/128) の記述.
- 系統遺伝的関係を決定するためのクラディスティック分析.
- 頭蓋骨の特徴,胃石,胃の内容物のエコモルフォロジック分析.
主要な成果:
- Deinocheirusは,独特な骨格の特徴を持つ,最大の知られているオルニトミモサウルスの存在が確認されています.
- 証拠によると,Deinocheirusは,メガオムニボリーに適応した,体型が重く,カーソリアルではない動物であった.
- 胃の内容物 (魚の残骸) と胃石の分析は,メシック環境での食事と生息地を示している.
結論:
- Deinocheirus mirificusは,オルニトミモサウリアのユニークな,大きな体型,オムニヴォーラなメンバーを表しています.
- 新しい化石の証拠は,その解剖学,系統遺伝的位置,そして古生態学的役割を明らかにする.
- この研究は,この珍しい恐竜を取り巻く長年の謎を解明しています.
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