vertebrates and ancient reptiles belong to ichthyosaurs. The body is spindle-shaped, looks like a fish, and the limbs become fin feet, which is suitable for swimming. The dorsal fin is fleshy, and the upper leaves of the caudal fin are short and the lower leaves are long. The neck is very short, the eyes are big, the kiss is long and the teeth are sharp. Living in the ocean. Fierce, feeding on animals. Viviparous Jurassic is the most prosperous. The "Tibetan Himalayan ichthyosaur" discovered by paleontologists in China on the 4,8-meter-high mountain of Mount Everest in Tibet is the highest vertebrate fossil in the world, which proves that this area was once a sea of Wang Yang. It is 1 meters long and lived in the early Triassic and became extinct in the Cretaceous. Ancient reptile name. Shaped like a fish, it was born in the ocean. The limbs are paddle-shaped and suitable for swimming. Big eyes. Long mouth, sharp teeth and meat. Viviparous It flourished in Jurassic. ?