ガレアスピッドの解剖学と脊椎動物のペア付属体の起源

Zhikun Gai^1,2,3, Qiang Li^1,4, Humberto G Ferrón^5,6

¹Key CAS Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences (CAS), Beijing, China.

Nature

|September 28, 2022

まとめ

ガレアスピドには連続した腹側翼があり,の脊椎動物では胸翼と骨盤翼が別々に進化した. この羽根は受動的に持ち上げられ羽根折れ仮説を裏付けました

科学分野:

古生物学
進化生物学
脊椎動物の解剖学

背景:

ペアリングしたはのある脊椎動物の進化における重要な革新です
絶滅したのない脊椎動物は多様なペアで体の拡張を示している.
オステオストラカンは最古の胸の付属体を持っていると考えられています.

研究の目的:

オステオストラカンとの脊椎動物の姉妹群であるガレアスピドのペア付属体を調査する.
羽根の折りたたみから異なるペア羽根への進化的移行を理解する

主な方法:

チュージアアスピス・ヴィヴィダス (Silurian期,中国) の骨組み化石の分析.
他の幹のグナトストームとオステオストラカンとの比較解剖学.
計算された流体力学実験でフィン機能を評価する.

主要な成果:

ガレアスピドは,枝から尾まで連続した腹側翼を持ち,胸翼や骨盤翼は分化していなかった.
これらの腹側翼は翼折れ仮説と合致して動的に持ち上げを生成します
胸の微分化は後になってオステオストラカンとの脊椎動物へと進んだ.

結論:

ガレアスピドは,ペアリングの進化に関して,オステオストラカンとの脊椎動物の前身である.
ペアリングの羽根は先端の分化前に連続した横構造として進化した.
この進化の経路は,ペアリングされた付属体の起源と,その後の移動のための専門性を説明します.

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