Abstract: The Lower Devonian strata of the Wenshan Distinct in southeastem Yunnan are well exposed and can be subdivided into Posongchong, Pojiao and Bajiaoqing formations in ascending Older. As a typical non-marine stratum，the Posongchong Formation bears abundant fossils of plants, spores and early vertebrates, including antiarchs，sarcopteryglans and galeaspids such Kwangnanaspis subtriangularis (Cao, 1979), Gantarostrataspis gengi, (Wang and Wang, 1992) and Macrothyraspis longicornis (Pan, 1992) . Recently, new galeaspid specimens were collected from the lower part of the Posongchong Formation in Gumu, Wenshan (Fig. 1). They are referred to Wenshanaspis zhichangensis gen. et sp. nov., Sanqiaspis rostrata (Liu, 1975) and M. longicornis (Pan, 1992) respectively. All of these fossils show that the Posongchong Formation is of Pragian in age, like the Xujiachong Formation in Qujing, eastern Yunnan and the Pingyipu Formation in Jiangyou, Sichuan. Gantarostrataspis gengi and Sanqiaspis rostrata exclusively found in these three regions indicate their biogeographic connection.

摘要： 描述了采自云南东南部文山地区下泥盆统坡松冲组下部的无颌类化石，建立了盔甲鱼类的一新属、新种——纸厂文山鱼(Wenshanaspis zhichangensis gen. et sp. nov. )，同时修订了两个盔甲鱼类的旧属、旧种）——长吻三歧鱼(Sanqiaspis rostrata)及长角大窗鱼(Macrothyraspis longicornis)。迄今为止，长吻三歧鱼仅在四川江油雁门坝的平驿铺组中部发现并记述过，长角大窗鱼也仅有一件采自云南广南坡松冲组中的正型标本，而纸厂文山鱼为滇东南文山地区首