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 early era eurhinosaurus evolution extinct fish giant huge ichthyosaur ichthyosaurus jurassic large late life lizard marine monsters ocean paleoart paleontologist paleontology predator prehistoric primeval quadriscissus rendering reptile reptiles sea shastasaurus shonisaurus stenopterygius swimming triassic underwater vertebrate water