elasmosaurus, long-necked plesiosaur from the late cretaceous period, 3d science

elasmosaurus longnecked plesiosaur late cretaceous period 3d science illustration dinosaur dino park platyurus species creature large animal ancient primeval prehistoric jurassic underwater aquatic ocean sea monster serpent nessy palaeontology palaeontologist evolution primitive vertebrate lizard history era carnivore extinct nature reptile rendering marine one longest necked animals have ever lived