ジュラ紀の陸生動物から生まれた新種の鳥類であるセロポッド
Liming Xu1, Min Wang2, Runsheng Chen1
1Fujian Institute of Geological Survey, Fuzhou, China.
Nature
|September 6, 2023
まとめ
中国で発見された ジュラ紀の鳥の化石は 独特な特徴を明らかにしています この発見は ジュラ紀後期における 初期の鳥類の進化とその多様な生活様式に 光を当てています
科学分野:
- 古生物学
- 進化生物学
- 脊椎動物 古生物学
背景:
- 鳥の起源は 飛べないセロポッド恐竜から 進化論の研究の重要な分野です
- 初期の鳥類の化石記録は稀で 初期の鳥類の進化の理解を制限している.
- 初期鳥類の正確な起源と多様化について 系統遺伝学的な論争がある.
研究 の 目的:
- 地理的に,また地層学的に重要な初期の鳥類の化石を記述する.
- 進化のモザイク主義を 深い鳥類の系統学で調査する
- ジュラ紀後半の河動物群の古環境と生態系を再構築する.
主な方法:
- 福建ヴェネーター・プロディジオスの形状の説明
- 中生期の鳥類と非鳥類のセロポッドとの比較分析
- 地上放射性同位体年代測定と地層調査により,年代的枠組みが確立される.
主要な成果:
- 中国で発見されたフジヤンヴェネタール・プロディジオサス (Fujianvenator prodigiosus)
- F. prodigiosusは 長い後肢を含む 特徴のユニークな組み合わせを示しています
- 河動物は148~150万年前のもので 水生・半水生脊椎動物も含まれている.
結論:
- F. prodigiosusは初期の鳥の進化における 進化的なモザイク主義を示唆している.
- F. prodigiosusの陸上または水上適応は,他の初期の鳥類の樹上/空間の適応と対照的です.
- ジュラ紀後半の陸生生態系と脊椎動物の多様性について 重要な洞察を与えてくれます
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