原鯊齒鯨的外觀像現今的齒鯨,且與齒鯨有關。牠長約2.3米,及像海豚。原鯊齒鯨有長的顎骨,牙齒像恆河鱷般向外伸出,就算不張開口也能看到牙齒。牠的口內像早期的鯨魚般有三角牙齒。原鯊齒鯨像現今的鯨魚般有氣孔。
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