Two male, a female Keichousaurus and Asialepidotus fossil, with dorsal pressure facing upward, the skull, and eye sockets can be clearly seen, The lengths of Keichousaurus are 24, 23 and 18 cm respectively and the fish is about 21 cm. The white wire is quartz wire. It is rare for these two species to come together to form fossils. 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.