这种食肉动物已被确认为一种上龙，上龙是一类已经灭绝了的水生爬行动物，有巨大的头骨，粗短的脖子，还有令它们在水里来去自如的四只脚蹼。
The predator has been identified as a new species of pliosaur, a group of extinct aquatic reptiles that had huge skulls, short necks and four flippers to power them through the water.
据说在苏格兰尼斯湖中的巨大象蛇或蛇颈龙的水生怪物。
Large aquatic animal supposed to resemble a serpent or plesiosaur of loch ness in Scotland.
另一些科学家认为蛇由沧龙进化而来，沧龙是生活在一亿四千四百万年前至六千五百万年前的一种巨型水生蜥蜴。
And others believed that snakes evolved from the mosasaurs, giant swimming lizards that lived 144 to 65 million years ago.
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