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鱼龙(拉丁语学名:Ichthyosauria,来自希腊语ιχθυ,“鱼”和σαυρο“蜥蜴”)是一种类似鱼和海豚的大型海栖爬行动物。它们生活在2.5亿年前至9000万年前的中生代,在侏罗纪时分布尤其广泛,比恐龙灭绝早约2500万年。在三叠纪中期还未能确定的陆栖爬行动物逐渐回到海洋中生活,演化为鱼龙,这个过程类似海豚和鲸的演化过程。在白垩纪时期它们作为最高的水生食肉动物被蛇颈龙取代。鱼龙的起源,目前尚缺少可靠的线索,已知最早的是早三叠世晚期的化石,因此
Ichthyosauria (Latin name: Ichthyosauria, from Greek ιχθυ, “fish” and σαυρο “lizard”) is a large marine amphibian that resembles fish and dolphins. They lived in the Mesozoic from 250 million years ago to 90 million years ago. They were particularly widespread during the Jurassic period, about 25 million years earlier than the dinosaurs were extinct. In the mid-Triassic period, the terrestrial reptiles that have not yet been identified gradually return to life in the oceans and evolved into catamarans, a process similar to the evolution of dolphins and whales. They were replaced by the plesiosaurus as the highest aquatic predator in the Cretaceous. The origin of the fish dragon, there is still no reliable clues, is known to be the earliest fossils of the early Triassic, therefore