脳構造は,アノマロカリジド付属体のセグメンタル・アフィニティを解決する
Peiyun Cong1, Xiaoya Ma2, Xianguang Hou1
1Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China.
Nature
|July 22, 2014
まとめ
この研究は,古代の節足類の親戚であるLyrarapax unguispinusがセグメント化された脳を持っていたことを明らかにしています. この発見は,アノマロカリジドが幹群ユーアートロポッドであり,前頭付属体がラブラムに進化することを支持しています.
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
- 神経科学は神経科学である.
背景:
- アノマロカリジドは,カンブリア紀の著名な化石で,転移する動物 (エクディゾーア) の間の進化的関係が不明である.
- 以前の研究では,幹群のエウアートロポッド,冠群のエウアートロポッド,または明確な正面付属体のホモロジーがないため,別々の系統として配置について議論されました.
研究 の 目的:
- 新しい種であるLyrarapax unguispinus.の神経解剖学を調べることで,アノマロカリディド (ラディオドンタ) の親和性を調査する.
- アノマロカリジド頭部のセグメンタル組織と,その前頭部の付属体の起源を明確にするために.
主な方法:
- カンブリア初期チェンジャング生物群のLyrarapax unguispinusの記述,軟組織を保存する.
- 化石化した脳組織における炭素に富んだ領域を分析し,神経組織と付属体の接続を推論する.
主要な成果:
- Lyrarapax unguispinusは,前頭部付属体に結びついたペアリングされた前前頭脳ガンジアと,背面のセグメント化された脳を示しています.
- 神経解剖学的証拠は,サイクロネウラル類と異なる放射性歯類と節足類の同盟を支持しています.
- 脳組織はオニコフォラと並行しており,眼前前頭部付属体は,ユーアートロポッドとオニコフォランスの祖先の特徴であることを示唆しています.
結論:
- ラジオドントは,エウアートロポッドの幹系統に配置されています.
- アノマロカリジド類のペア状の正面付属体は,冠群のエウアートロポッド類のラブラムに同型である.
- この研究は,アノマロカリジド頭部のセグメンタル組成とその関節足類の進化への影響について直接的な証拠を提供します.
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