原鲸(学名:Protocetus atavus )是一种已经灭绝的古代鲸鱼,属于原鲸科。巴基鲸生活在始新世中期。原鲸身长为2.5米。
原鲸是一种相当原始的鲸鱼,仍然拥有后鳍,前鳍则长有脚趾。牠们的长下颚中长有锐利的牙齿。与更原始的巴基鲸不同的是,原鲸可以完全听见水中的声音。
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