Since 1999,12 geneus and 17 species of marine reptiles,including the first placodont and the first thalattosaur of China have been reported from the Upper Triassic of Guanling in Guizhou Province.For the reasons of preserve situation and the difficulty of preparation,there are a lot of synonym and the nomen dubium in the published taxa.According to the published data,there are 5 valid geneus and 6 species in all.They are:Qianichthyosaurus zhoui Li,1999;Anshunsaurus huangguoshuensis Liu,1999;Sinocyamodus xinpuensis Li,2000;Psephochelys polyosteoderma Li & Rieppel,2002;Xinpusaurus suni Yin in Yin et al.,2000;Xinpusaurus bamaolinensis Cheng,2003.Besides,two new types of large,short-rostrumed ichthyosaur and thalattosaur are recognized.