中国の白亜紀初期に生息していた基礎型トロオドンチド
Xing Xu1, Mark A Norell, Xiao-lin Wang
1Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China. xxu@midwest.com.cn
Nature
|February 15, 2002
まとめ
新しい基礎型トロドンチド恐竜,シノヴェネーター・チャンギは,マニラプトラ進化の初期の鳥類のような特徴を明らかにしている. この発見は,以前の系統遺伝学的な位置づけに異議を唱え,恐竜の初期の鳥のような改変を強調しています.
科学分野:
- パレオントロジー・パレオントロジー
- 進化生物学の進化生物学について
- 脊椎動物学 脊椎動物学
背景:
- トロオドンチド恐竜は,鳥類のような特徴を示しているが,その進化的関係は依然として論争の的だ.
- 以前の分類は,トロオドンチドを様々なコエルロサウルスの系統と結びつけ,複雑な系統遺伝の歴史を示していた.
研究 の 目的:
- 中国の下部Yixian Formationの新しい基礎型トロドンチド恐竜,Sinovenator changiiを記述するために.
- シノヴェネーターの独特の形態学的特徴の系統学的意味を分析する.
主な方法:
- Sinovenator changii.の化石の残骸について説明する.
- マニラプトラ族の特徴分布に関する系統遺伝学的分析.
主要な成果:
- Sinovenator changiiは,ドロメオサウリドやアビアランと共通する特徴を持ち,より派生したトロオドンチドとは異なる.
- この発見は,鳥の飛行のための重要な構造的適応が,マニラプトラの進化の初期に進化したことを示唆している.
結論:
- Sinovenator changiiは,Troodontidaeの基礎的メンバーを代表し,初期のマニラプトラ進化の洞察を提供します.
- 初期のマニラプトランは,高度なトロドンチドの多様化より前の,重要な鳥のような特徴を獲得しました.
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