Male Keichousaurus fossil, the animal is about 28 cm long. The general situation is abdominal type. The details are clear. The white line is quartz line. The Matrix was repaired after being broken, but the fossils are entirely natural. This marine reptile is also relatively large. No reserve price! 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.