2025 biology talkshow : 哺乳動物起源與演化-從合弓綱到現代

概述哺乳動物漫長而複雜的演化史，起始於約3.2億年前從羊膜動物分化出來的合弓綱。追溯從早期具備顳顬孔的盤龍目，到肢體開始垂直排列且牙齒分化的獸孔目（特別是犬齒獸亞目）的演變，這些類群展現了朝向哺乳類發展的重要過渡特徵，如橫膈膜、可能的體毛和中耳骨的雛形。隨後，文章介紹了三疊紀晚期出現的早期哺乳類，並討論中生代繁盛卻最終滅絕的多個獨立支系，同時強調了唯一延續至今的非胎生哺乳類——單孔類——在演化研究中的獨特價值。闡述現代哺乳類兩大分支——後獸類（有袋類）與真獸類（胎盤類）——的分化與演化策略，總結哺乳動物如何透過一系列形態、生理及生殖策略的創新，從邊緣動物發展為今日全球的主宰者。 Powered by Firstory Hosting

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2025 biology talkshow : 哺乳動物起源與演化-從合弓綱到現代

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