Fossils of the freshwater "Odontochelys semitestacea" or "half-shelled turtle with teeth", from the later Triassic, have been found in southwest China. "Odontochelys" displays a complete bony plastron and an incomplete carapace, similar to an early stage of turtle embryonic development. By the Upper Jurassic, turtles had radiated widely, and their fossil history becomes easier to read.