Keichousaurus hui is one of the most representative small marine reptiles of the Late Triassic. Birgeria: These fish had slender bodies, pointed snouts, and sharp teeth, and were upper-level predators at the time. Location: Guanling-Xingyi area, Guizhou Province, China Environment: Shallow marine lagoon sediments Description: Keichousaurus hui and Birgeria lived in the same shallow marine ecosystem, occupying different dietary levels. The former preyed on small fish and shrimp, while the latter was a medium-sized predator. They are very rarely found buried together! Highly collectible!