2 Keichousaurus fossil, with dorsal and abdominal type, the skull, and eye sockets can be clearly seen, and the animal are about 29 and 17 cm. The white wire is quartz wire. It is very rare to have two forms of fossils on the same plate. 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.