Plesiosaurs and pliosaurs were the dreaded "sea serpents" of the Jurassic and Cretaceous periods. Here are pictures, illustrations and photographs of various plesiosaurs and pliosaurs, ranging from Aristonectes to Thililua.
 Aristonectes |  Attenborosaurus |  Brachauchenius |  Cryptoclidus |
 Dolichorhynchops |  Elasmosaurus |  Futabasaurus |  Kaiwhekea |
 Kronosaurus |  Leptocleidus |  Libonectes |  Liopleurodon |
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