まとめ
低ペルミアン期の植物化石は,サイカダ族のメガスポロフィルの存在を示し,サイカダの化石の歴史は,旧生代後期まで遡る. これらの発見は,血管精子のカーペルの進化に関する洞察を提供することができる.
科学分野:
- パレオボタニーは古植物学です.
- 植物の進化 植物の進化
- パレオゾイク期の植物
背景:
- サイカッドは古代の種を産む植物で,化石記録が著しい.
- 前回のサイカドの化石の証拠は主にトライアシク後期に遡る.
- ペンシルバニアのTaeniopteris複合体は,初期の種の群れを表しています.
研究 の 目的:
- 米国南西部の下ペルミアン期の植物化石を再評価する.
- これらのペルミアン期の植物化石の系統遺伝的 afinities を決定するために.
- サイカドの既知の化石の歴史を拡張し,進化のつながりを探求する.
主な方法:
- 植物の大化石の形態学的分析.
- 化石を含む岩層のストラトグラフィック分析.
- スペルモプテリドやタニオプテリスを含む,既知の化石植物群との比較分析.
主要な成果:
- 低ペルミア層の植物化石は,サイカダリアンメガスパロフィールとして識別されました.
- これらの化石は,ペンシルバニアのTaeniopteris複合体内の精子鳥類の要素からの系統を証明しています.
- サイカドの化石記録は,現在,トライアシク後期から,さらに後期パレオゾーイク時代に遡ります.
結論:
- 下ペルミア紀の化石は,最も初期のサイカダリアンメガスパロフィール群を表しています.
- この発見は,サイカドの起源をパレオゾーイク後期に大幅に後押ししています.
- この発見は,種子植物の初期の進化と,アンジオスペルムのカーペルの発達との潜在的な関連について,新しい視点を提供しています.
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