1 Introduction The Guanling Biota is characterized by abundant, well-preserved Late Triassic fossils notably marine reptiles and crinoids, and especially complete articulated ichthyosaur skeletons of large-size up to more than 10 m and the first Chinese thalattosaurs and placodonts. This fauna is attracting more and more interest from scientists all over the world and thus the time is right for a review of the taxonomic diversity. Mu’s (1949) description of several crinoid species from Gua…