軛根鯨(Zygorhiza)是已滅絕的鯨魚,化石發現於美國和新西蘭。
軛根鯨與龍王鯨有關,但卻較為短小。牠約有6米長。軛根鯨的鰭可以在肘部活動。牠的後肢並不發達。牠的頭顱骨長1米,有強壯的顎骨及牙齒。軛根鯨的頸部有7節脊骨。
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