云南富源中三叠世楯齿龙新材料

A New Species of Glyphoderma (Reptilia: Placodontia) of Middle Triassic from Fuyuan County,Yunnan Province,China

中国已知的豆齿龙类化石有贵州关岭晚三叠世新铺中国豆齿龙、多板砾甲龟龙及云南富源中三叠世康氏雕甲龟龙。记述了一件楯齿龙目豆齿龙亚目的新材料,产自云南富源法郎组竹杆坡段,时代为中三叠世拉丁期,标本(编号C.1924)现收藏于重庆自然博物馆,该标本保存有完整的背甲、尾椎和四肢的部分骨骼,背甲由500多枚小骨板组成,背甲整体结构与康氏雕甲龟龙相似,但背甲中部无沟和脊,背甲骨板表面无放射沟和嵴,排列更加致密,侧壁相对更为发达,由连接紧密的3~4排骨板组成,四肢骨相对于康氏雕甲龟龙来说更为粗壮。根据上述特征,认为是雕甲龟龙属的一个新种--粗壮雕甲龟龙(Glyphoderma robusta sp.nov.),这是继康氏雕甲龟龙之后在云南富源发现的第二个豆齿龙类物种。

The fossils of Cyamodontoidea known in China are Late Triassic Sinocyamodus xinpuensis and Psephochelys polyosteoderma from Guanling County of Guizhou Province,and Middle Triassic Glyphoderma kangi from Fuyuan County of Guizhou Province.This paper deals with a new specimen of Cyamodontoidea(Reptilia:Placodontia)from the Zhuganpo Member of the Latinian Falang Formation of Middle Triassic in Fuyuan County of Yunnan Province.The specimen(C.1924)is now stored at Chongqing Natural History Museum.The studied specimen is well preserved with dorsal carapace,caudal vertebrae and some bones of the four limbs.The dorsal carapace consists of more than 500 small bony plates.In general,the carapace is similar to that of Glyphoderma kangi,without any groove or ridge in its middle part though.The carapace plate is densely arranged,without any radial groove or ridge on its surface.Its side wall is relatively more developed,composed of 3 to 4 ribs with tight connections.The four limbs of the studied specimen are much sturdier than those of Glyphoderma kangi.According to the characters mentioned above,the studied specimen is considered as a new species:Glyphoderma robusta sp.nov.This is the second species of Glyphoderma found from Fuyuan County of Yunnan Province.