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初期の哺乳類における白亜紀のユートリコノドントとの進化
Thomas Martin1, Jesús Marugán-Lobón2,3, Romain Vullo4
1Steinmann-Institut für Geologie, Mineralogie und Paläontologie, Universität Bonn, Nussallee 8, 53115 Bonn, Germany.
Nature
|October 16, 2015
まとめ
スペインの"億2,500万年前の哺乳類の化石は 毛皮や皮膚のような 中世哺乳類の特徴を明らかにしています この発見は 恐竜の絶滅前の 早期の哺乳類の多様性と適応を 強調しています
科学分野:
- 古生物学
- 進化生物学
- 哺乳類の進化
背景:
- メソゾイク時代には初期の哺乳類の生態学的多様性が顕著であった.
- 恐竜の絶滅後の成功にとって 重要な哺乳類の特徴が この期間中に進化しました
- 多くの現代の哺乳類のような形態は哺乳類の歴史の初期に独立して進化した.
研究 の 目的:
- スペインの1億2,500万年前の哺乳類の化石を報告する
- この中生期の哺乳類の 皮膚と皮の保存を記録します
- メソゾーイク時代まで 哺乳類の重要なの特徴の記録を拡張する.
主な方法:
- 化石の発見と毛皮の特徴の分析
- 軟組織 (肺,肝臓) と骨格構造の保存の検査
- 現存する哺乳類のと骨格の特徴の比較分析.
主要な成果:
- 皮膚と毛皮の保存が 素晴らしい 125万年前の哺乳類の発見
- 毛皮,毛皮,皮皮,原骨,複合毛皮を含む哺乳類の特徴の識別.
- 肺と肝臓と 筋肉状の腹膜の証拠 歯の入れ替えと 脊椎関節の証拠
結論:
- この化石はメソゾーイク時代に 哺乳類の重要なの特徴が 存在していたことを示しています
- その皮膚の構造は,現存する哺乳類に似た変異を持つ他の冠哺乳類で独立して見られる特徴の組み合わせを示している.
- 骨格と軟組織の特徴は,現存するクセナートラン哺乳類との収束進化を示唆し,移動のための適応を示唆する.
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