ichthyosaur, stenopterygius quadriscissus swimming in the ocean, extinct marine reptile from early triassic to late cretaceous, 3d

animal aquatic carnivore carnivorous creature cretaceous dangerous dinosaur era eurhinosaurus evolution extinct fish giant huge ichthyosaur ichthyosaurus jurassic life lizard marine monsters ocean paleoart paleontologist paleontology predator prehistoric primeval rendering reptile sea shastasaurus shonisaurus stenopterygius triassic underwater vertebrate water