Abstract: A new species of Nothosaurus, N. rostellatus, is described from the early Middle THassic Guanling Forrnation ( Member II) in Panxian County , Guizhou Province, China. It is a medium sized species and characterized by relatively small rostrum, more than six precanine maxillary teeth, cleveloped ectopterygoid flanges, dstinct pachyostotic" shoulder" part of dorsal ribs. It represents the first record of Anisian Nothosaurus in the Eastern Tethyian faunal province.