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.

摘要： 作为三叠纪海生爬行动物的重要分子，幻龙属化石主要发现于欧洲、中东和中国西南地区的中三叠世海相地层，且主要集中分布于安尼期晚期和拉丁期晚期(Edinger, 1921; Haas, 1980; Rieppel, 2000)。我国目前已报道的幻龙属化石有两种：杨氏幻龙(Li and Rieppel, 2004)和幻龙属未定种(Rieppel, 1998), 它们均产于贵州省兴义地区的法郎组竹杆坡段，时代为中三叠世拉丁期。最近在贵州省盘县地区关岭组II段地层中也发现了数量较多的幻龙骨骼化石，证明中三叠世早期东特