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パレオセンのジュラ紀後期の哺乳類のような爬虫類
R C Fox1, G P Youzwyshyn, D W Krause
1Laboratory for Vertebrate Paleontology, Department of Geology, University of Alberta, Edmonton, Canada.
Nature
|July 16, 1992
まとめ
化石の発見は,後期パレオセンのセラプシドを明らかにし,これらの哺乳類のような爬虫類の既知の範囲を1億年延長しました. この発見はセラプシドの最初のケノゾイク紀の記録となり,その進化の歴史に関する我々の理解に大きな影響を与えました.
科学分野:
- パレオントロジー・パレオントロジー
- 動物学 動物学
- 脊椎動物の進化について
背景:
- 哺乳類のような爬虫類であるセラプシダは,シナプシドから哺乳類の起源を理解するために重要である.
- 以前は,セラプシドはジュラ紀中期までに絶滅したと考えられていた.
研究 の 目的:
- 以前に知られている標本よりもかなり若いセラプシド化石の発見を報告する.
- オーダー・セラプシダの既知の階層学および時間的範囲を拡大する.
主な方法:
- 化石化したセラプシドの残骸 (歯と孤立した歯) の発掘と識別.
- カナダのアルバータ州パスカプー群の化石含有床のストラティグラフィック分析.
- 関連する哺乳類のファウナの年代測定は,セラピドの発見の年齢を決定します.
主要な成果:
- 以前から認められていた絶滅の年月日から約1億年後の,旧紀末期のセラプシド化石の発見.
- 化石は,セラプシドの最初のケノゾイク期の記録を表しています.
- この新分類は,セラプシドの層図の範囲を大幅に拡大している.
結論:
- テラプシドは,以前に理解されていたよりもずっと後にケノゾーイクに存在し続けました.
- この発見は,セラピシドの絶滅のタイムラインの見直しを必要とする.
- この発見は,脊椎動物の進化に関する私たちの理解を再構成する新しい化石の証拠を発見する可能性を強調しています.
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