中国新疆下のトライアスク時代のジューカイユアン群のジューカイユアン群 (Therocephalia) の追加素材
Jun Liu1,2, Fernando Abdala3,4
1Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China.
Anatomical record (Hoboken, N.J. : 2007)
|August 30, 2025
まとめ
中国から発掘された新化石は 型頭型動物である Jiucaiyuangnathus confusus の幼い標本です これらの発見は急速な成長を示唆し,未成年の特徴に基づいた以前の遺伝学的な解釈に異議を唱えます.
科学分野:
- 古生物学
- 脊椎動物 古生物学
- セラプシダ エボリューション
背景:
- Jiucaiyuangnathus confususは,バウリオイド型セロケファリアンであり,以前は中国新疆の下トライアスク Jiucaiyuan 形成から記述されていた.
- 新疆のターパンで同じ地質学的な地平線から新しい標本が追加解剖学的および組織学的データを提供しています.
研究 の 目的:
- 新しく採集された Jiucaiyuangnathus confusus の標本を記述し,参照する.
- ヒストロジカルな特徴と アナトミックな変異を分析する.
- オントジェネティックな年齢に基づいて 系統遺伝的特徴を再評価する.
主な方法:
- 頭蓋骨と部分骨格を含む,新たに収集された化石標本の記述.
- 年齢と成長パターンを決定する骨構造の組織学的分析.
- 既存のセロセファリアン分類と比較した解剖学的分析
主要な成果:
- 新しく紹介された標本には,歯の数と腹膜の長さなど,全型から変化が見られます.
- ヒストロジカル・エビデンスは,迅速な骨形成と1歳未満の死亡を示しています.
- プロオティクスの報告されていない特徴は,中間プロセスと折りたたまれた横面を含む.
- Jiucaiyuangnathus confususの改訂された診断特征には,上関節の関節と5〜6つの上部切歯器が含まれています.
結論:
- 小型犬のサイズなどの幼少期の特徴は,テロセファリアンにとって信頼性の高い遺伝学的な特徴ではありません.
- Jiucaiyuangnathus confususは,パンゲア北から最も広く知られているバウリオイドです.
- パンゲア南部のエリチオラセータ・パーヴァとの類似性は,共通の初期のオントジェネティック年齢によるものである.
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