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新しい爬虫類は,恐竜とペトロサウルスが,様々な前駆者の間で進化したことを示している
Rodrigo T Müller1,2, Martín D Ezcurra3, Mauricio S Garcia4,5
1Centro de Apoio à Pesquisa Paleontológica da Quarta Colônia, Universidade Federal de Santa Maria, São João do Polêsine, Brazil. rodrigotmuller@hotmail.com.
Nature
|August 16, 2023
まとめ
新しい化石であるヴェネトラプターガッセナは 初期の恐竜の先駆者における 猛禽類のノックと大きな爪を明らかにし 恐竜の似たような特徴は8000万年前に遡ります この発見は 鳥類の進化における 初期の形態学的多様性を強調しています
科学分野:
- 古生物学
- 脊椎動物の進化
- 中生期の爬虫類
背景:
- 恐竜とペトロサウルスはメソゾーイク時代の初期に顕著な多様性と生態学的革新を示した.
- これらのグループの前身は多様で広範囲に広がっていましたが,特に頭蓋骨や手などの保存状態の良い骨格が残っていません.
研究 の 目的:
- ベネトラプター・ガッセーナという 保存状態の良い 新種のラガーペティドの化石についてです
- 初期の恐竜とペトロサウルスの 頭蓋骨の形状,生態,進化の位置について 新しい洞察を提供するためです
主な方法:
- 頭蓋骨と手の要素を含む部分骨格の発掘と詳細な解剖分析.
- 他の既知の恐竜とペトロサウルスの前体との比較解剖分析.
主要な成果:
- ヴェネトラプター・ガッセナエは 鋭い 猛禽獣のくちばしと 長い爪を持つ大きな手を持ちました これはこれらの系統における 強制的な四足歩行の喪失を示しています
- 先駆者の形態的差異はトライアスクのプテロサウルと比べられ,トライアスクの恐竜よりも大きいことが判明した.
結論:
- 恐竜とペトロサウルスの"成功"は,より広い範囲のエコモルフォロジカルバリエーションの間の 差異的な生存から生じた.
- オルニトジラの形態的多様性は,恐竜やペトロサウルスの出現後だけではなく,早期の異なった系統に由来しています.
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