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thumbnail 酷研究／大陸中科院：「有臉」生物始於4億年前的魚
Oct 2nd 2013, 06:10, by service.nownews@gmail.com (nownews)

〔大陸新聞中心／綜合報導〕頜骨是脊椎動物臉部構造的關鍵特徵。從大白鯊到人類，長著上下嘴巴的脊椎動物被稱為有頜類，它們是脊椎動物演化的主幹，占現生脊椎動物物種數的99.7%。但從進化角度而言，生物究竟是從什麼時候開始有了頜骨呢？

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