Spots:澎湖鱷化石 肚裡有個鹿頭20070119
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澎湖鱷化石 肚裡有個鹿頭
距今1400萬年 可能是全新物種 填補台灣「中新世」時期空白 極具學術價值
澎湖民眾潘明國去年在西嶼鄉赤馬村海邊挖出一具估計距今約1400萬年前的馬來鱷化石，經國立自然科學博物館初步研究發現，這頭馬來鱷的內鼻孔呈大三角形，與一般鱷魚內鼻孔迥異，極可能是全新物種，研究人員同時在馬來鱷的腹腔發現一個完整的鹿頭骨，究竟是被鱷吞食，或是動物塚擠壓造成，仍待釐清。
科博館地質研究員程延年指出，這具化石應是1400萬到1000萬年前「中新世」時期的馬來鱷，這不僅是澎湖發現年代最早的鱷魚化石，也是台灣地區首度在地層中發現脊椎動物化石，顯示台灣與西太平洋化石生物群有關連，台灣在中新世時期空白的「失落環節」也能因此填補起來，學術價值非凡。
程延年說，科博館研究人員在修復及重組化石的過程中，還發現這具馬來鱷化石有部分很奇怪的特徵，例如一般馬來鱷的內鼻孔呈剖開梨形狀，但這頭馬來鱷的內鼻孔卻是大三角形狀，連加拿大研究人員也說：「這太奇怪了，無法解釋。」
程延年說，研究人員初步研判，這頭馬來鱷屬於馬來鱷大家族，但在分類上極可能是全新物種，但也不排除內鼻孔可能是遭受到擠壓變形或其他因素造成，研究人員將再研究資料比對。
研究人員同時在馬來鱷的胸腔與腹腔中間部位，發現一塊完整的頭骨，初步推測與馬來鱷應屬同一時期存在的哺乳類動物鹿的化石，這個發現讓研究人員覺得很有趣，如果是馬來鱷掠食鹿，那表示當時沼澤中的鱷魚也吞食陸地上的生物，不過若是吞食，如何還能保持鹿的頭骨完整，讓研究人員不解。
資料來源：聯合報記者肇瑩如／澎湖報導2007/01/19
