article: Plesiosaur
links: Reptile Liopleurodon John Edward Gray Charles Darwin Styxosaurus Kronosaurus Triassic Jurassic Coast Cretaceous Dakota County, Minnesota Animal K/T extinction event Mary Anning Elasmosaurus Jurassic Animal shell Chordate Order (biology) Mosasaur Sauropterygia Upper Cretaceous Dorset Tylosaurus Ocean Plesiosaurus Pliosauroidea