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科学家经过12年的研究，在澳洲北部海域发现4种“走路鲨”，使该属的物种数增加至9种。

这4种新发现的鲨鱼属于天竺鲨科的其中一属，这些“走路鲨”以小型甲壳类与软体动物为食，平均体长不到1公尺，对人类没威胁。

研究团队透过活捉样本的DNA，找到它们与原有的5种天竺鲨之间的关系，该科物种最早可以追溯至6600万到1亿年前的白垩纪晚期。

这4种“走路鲨”很可能是原种来到新区域后又进化发展出的新种，预计新种鲨鱼从200万年前开始出现在澳洲北部与纽几内亚之间的热带珊瑚礁海域，它们最大的特色是能在低氧的环境中用鱼鳍行走。

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