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門框矽利康史前鯨魚化石揭祕「像海豹又像寶可夢」可愛到騙人

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門框矽利康鯨魚溫順又雄偉，但牠們的史前祖先，可能出乎意料地怪異、體型也不大。在澳洲海灘上偶然發現的2500萬年前化石，或許有助解開鯨魚演化之謎，研究人員將此發現的新物種命名為Janjucetus dullardi，牠有著大大的眼睛與尖牙，長相類似鯨魚、海豹，甚至還有點寶可夢裡怪奇生物的模樣。

與今日的鯨魚不同，科學家發現的幼體化石，估計小到可以放進一張單人床中，但牠尖銳的牙齒、如鯊魚一樣的口鼻以及強壯的下顎，在殘酷的海洋中，就是為了獵捕而存在。

包含耳骨、牙齒等的部分頭骨，2019年在澳洲維多利亞州海灘發現，Janjucetus dullardi是迄今確認的第四種「哺乳齒鯨類」（mammalodontids）物種，據信可長到約三公尺，是現今大型鬚鯨的早期分支祖先。

事實上，能保存下來並足以辨認的鯨魚化石實屬難得，期望對史前鯨魚如何進食、移動進一步了解，並研究古代鯨類如何適應較溫暖的海洋，也許有助研究現今海洋生物如何適應氣候變遷。

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