蛇颈龙类在儿童与神秘动物学方面非常普及，出现在许多的儿童书籍与几部电影里，并在儒勒·凡尔纳（Jules Verne）的小说《地心游记》（Journey to the Center of the Earth）里与一只鱼龙类一起出现。然而，在凡尔纳的小说里，蛇颈龙类比牠实际体型还大，并有类似乌龟的壳。在1899年的奇特短篇小说《The Monster of Lake LaMetrie》里，一个男子的大脑被装入一个蛇颈龙类的身体里。
牠们也出现在关于湖中怪兽的电影，例如1995年的《水怪传奇》（Magic in the Water），或是关于尼斯湖水怪的电影，例如1996年的《尼斯水怪》（Loch Ness）。也出现在1977年日本一部由大白鲨启发的电影《Legend of the Dinosaurs》。
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