Abstract: Three early vertebrates (galeaspids Sanqiaspis zhaotongensis Liu 1975, Lungmenshanaspis yunnanensis sp. nov., and an undetermined osteolepid), were described from the Early Devonian of Bianqinggou, Zhaotong District, northeastern Yunnan. It is argued that the fish-bearing formation could be directly correlated with the Posongchong Formation in Guangnan and Wenshan, southeastern Yunnan, and might be named as the Posongchong Formation, rather than the "Cuifengshan Formation". The Posongchong Formation of Bianqinggou yields abundant remains of early vertebrates including galeaspids, antiarchs, petalichthyids and sarcopterygians. Four genera of galeaspids have been described from this formation, i.e., Sanqiaspis (Liu, 1975; this paper), Qingmenaspis (Pan & Wang, 1981), Zhaotongaspis (Wang & Zhu, 1994), Lungmenshanaspis. As to the galeaspids, the Posongchong Formation of Zhaotong District is most similar to the Pingyipo Formation of Jiangyou, Sichuan. Both Lungmenshanaspis and Sanqiaspis are exclusively found in these two regions, indicating the presence of biogeographic connection.

摘要： 本文记述了发现于云南昭通篙门沟箐门水库附近的几件早期脊椎动物化石，其中包括盔甲鱼类一新种，层位是下泥盆统坡松冲组。新种云南龙门山鱼(Lungmenshanaspis yunnanensis sp. nov)与属型种江油龙门山鱼在纹饰上存在明显差异。其头甲侧凹应为自然边缘，龙门山鱼侧背孔并不存在。本文描述的骨鳞鱼类为目前所知层位最低的骨鳞鱼类化石，其额筛甲前端向下强烈弯曲，具分离的前上颌骨，具有杨氏鱼的一些特征。其眼眶凹非常大且深，下颌垂直凹线的位置十分靠前，k/m值在已知的骨鳞鱼目种类中为最大。昭通三歧鱼