Say hello to Keichousaurus, a sleek, paddle-limbed reptile that splashed through the shallow seas of what's now southern China about 240 million years ago. Belonging to a group called nothosaurs, this ancient aquatic adventurer is a superstar of the Triassic period. With its long neck, small head, and lizard-like body, Keichousaurus was perfectly built for life in the water—zipping after small fish and making a splash in prehistoric ecosystems!

Though it wasn’t technically a dinosaur, Keichousaurus is a big deal for dino fans and fossil hunters alike. It’s one of the most complete and commonly found fossils in the world, giving scientists an incredible window into early marine life. This little reptile shows us how life was already adapting to ocean living long before the giant marine reptiles and sea creatures of later eras took over the seas!