Female Keichousaurus fossil, the animal is about 19 cm. The general situation is dorsal type. The details are clear. The white line is quartz line. Please note that the middle matrix has broken and then reassembled. No reserve price and free shipping! Keichousaurus (key-cho-saurus) is a genus of marine reptile in the pachypleurosaur family which went extinct at the close of the Triassic in the Triassic-Jurassic extinction event. The name derives from Kweichow (now Guizhou Province) in China where the first fossil specimen was discovered in 1957. They are among the most common sauropterygian fossils recovered and are often found as nearly complete, articulated skeletons, making them popular among collectors.