Abstract: A new galeaspid, Zhaotonggaspis janvieri (gen. et sp. nov.), from the Posongchong Formation (Early Devonian Pragian) of Zhaotong northeastern Yunnan, China is described. This genus is characterized by at least 31 pairs of branchial fossae, which is the highest number ever recorded in agnathans. Its overall morphology is suggestive of both the Polybranchiaspiformes and Huananaspiformes. A new galeaspid family, Zhaotongaspidae (fame nov.), is erected on the basis of the Zhaotong material, and suggested that Antiquisagittaspis is a possible member of the new family. It is also proposed that the Zhaotongaspidae might. have the close affinity with the Duyunaspidae.

摘要： 本文记述了在滇东北昭通早泥盆世Pragian期坡松冲组中发现的盔甲鱼类一新属种，让氏昭通鱼(Zhaotongaspis janvieri gen. et sp. nov.)，该属至少具有31对鳃穴，这是迄今为止记述过无颌类中的最高数目。基于昭通标本，建立了盔甲鱼类一新科，昭通鱼科(Zhaotongaspidae)，该科隶属于多鳃鱼目。箭甲鱼属(Antiguisagittoaspis)是新科的可能成员。文章认为，昭通鱼科与都匀鱼科(Duyunaspidae)有较近的亲缘关系。