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ハルシジニアのオニコフォランのような爪とタクトポダのケース
Martin R Smith1, Javier Ortega-Hernández1
1Department of Earth Sciences, Downing Site, University of Cambridge, Cambridge CB2 3EQ, UK.
Nature
|August 19, 2014
まとめ
この研究では,カンブリア lobopodian Hallucigenia sparsa の爪は,現存する Onychophora (ベルベットワーム) のと爪に同類であることを明らかにしています. この発見は,幻覚性ロボポディアを初期のオニコフォランとして解明し,パナートロポッドの進化を明らかにします.
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
- 発達生物学 発達生物学について
背景:
- ロボポディア (Lobopodia) は,古生代"足の虫"の多様なグループで,派生文字の欠如のために,パナルトロポダ (Panarthropoda) の内の不明確な系統遺伝的位置を持っています.
- ロボポディアの関係を理解することは,オニコフォラ,ターディグラダ,ユーアートロポダの進化史を再構築するために極めて重要です.
研究 の 目的:
- パナートロポダ (Panarthropoda) の内のロボポディア (lobopodians) の進化的関係を調査する.
- ハルシゲニードロボポディアン,特にHallucigenia sparsa.の系統遺伝的位置を明らかにするために.
- パナートロポッドの系統形成に関する古生物学的な証拠を提供するため.
主な方法:
- Hallucigenia sparsa.の末尾の爪の詳細な形態学的分析について
- 爪の構造を,現存するオニコフォラのと爪と比較.
- パナートロポッドの頭部分割に関する発達データを含むクラディスティック分析.
主要な成果:
- Hallucigenia sparsaは,現存するオニコホーラに似た構成要素の積み重ねから作られた末尾の爪を持っています.
- クラディスティック分析では,幻覚性ロボポディアを幹群オニコフォランとして解明する.
- TardigradaとEuarthropodaの姉妹グループ関係は,古生物学的なデータによって支持されています.
結論:
- この研究は,パナートロポッド属に導いた進化的変異を明らかにしている.
- ロボポディアンは,祖先のパナートロポッドの形状を示し,初期の動物の進化に関する私たちの理解を伝えています.
- 考古学的な証拠は,TardigradaとEuarthropodaの結合を支持しています.
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