Using four paddle-like limbs to propel its bulky body through the water, the pliosaur made easy work of passing prey such as dolphin-like ichthyosaurs.

上龙用四根桨状的四肢推动它庞大的身体在水里游来游去，轻而易举地就能掠食形似海豚的鱼龙。

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The fossil skull of a 50-foot-long (15-meter-long) pliosaur was found in Norway in 2008.

这具颅骨化石来自于一条长达50英尺（合15米）的上龙，它在2008年发现于挪威。

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The researchers plan to excavate the second pliosaur when they return to Spitsbergen this summer.

研究者计划在这个夏季返回斯匹次卑尔根群岛挖掘第二具化石。

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Its estimated length exceeds that of another large pliosaur, dubbed "The Monster", which was uncovered in Svalbard a year earlier than this one.

BBC: Arctic sea monster's giant bite

It is thought to belong to a new species of pliosaur - a group of large, short-necked reptiles that lived at the time of the dinosaurs.

BBC: Arctic sea monster's giant bite