Plesiosaurs The LongNecked Lords of the Mesozoic Seas

The Plesiosauria[a][4] or plesiosaurs are an order or clade of extinct Mesozoic marine reptiles, belonging to the Sauropterygia. Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rhaetian stage, about 203 million years ago. [5] They became especially common during the Jurassic Period, thriving until their disappearance due to the Cretaceous-Paleogene extinction event.. Plesiosaurus pictures and facts Plesiosaurus was a plesiosaur, a type of marine reptile. It was not a dinosaur, though it coexisted with many dinosaurs. The first Plesiosaurus fossil was discovered in 1821. Plesiosaurus was an aquatic reptile of the Jurassic period.

Browse 258 authentic plesiosaur stock photos, high-res images, and pictures, or explore additional dinosaur or plesiosaurus stock images to find the right photo at the right size and resolution for your project.. As you can tell from Plesiosaurus pictures it makes them look very much like a combination of a snake and a turtle. One of the most interesting facts about Plesiosaurus is that these reptiles probably weren't very good swimmers.