According to evolutionary science, the earliest animal that could be called an ichthyosaur was ''Utatsusaurus'', which allegedly lived in the early Triassic Period some 245-250 million years ago. It has been claimed that ichthyosaurs evolved from this species, becoming some 80 or so species and thriving throughout the Mesozoic Era, only to become extinct at the end of the Cretaceous along with [[dinosaur]]s and flying reptiles. | According to evolutionary science, the earliest animal that could be called an ichthyosaur was ''Utatsusaurus'', which allegedly lived in the early Triassic Period some 245-250 million years ago. It has been claimed that ichthyosaurs evolved from this species, becoming some 80 or so species and thriving throughout the Mesozoic Era, only to become extinct at the end of the Cretaceous along with [[dinosaur]]s and flying reptiles. |