Abstract: A new dipnoan, Tarachomylax multicostatus sp. nov. is described from the Chuandong Formation(late Emsian, Lower Devonian) of Yunnan Province, South China. It represents the sixth dipnoan genus from the Devonian of China. The other five genera are Diabolepis(Chang and Yu,1984), Dongshanodus(Wang,1981) and Erikia(Chang and Wang,1995) from Yunnan, Sorbitorhynchus(Wang et al.,1990,1993) from Guangxi, and Chirodipterus(Song and Chang,1991) from Hunan. The associated early vertebrates include Kenichthys campbelli, Heimenia sp.(Chang and Zhu,1993; Zhu and Wang,1996) and an undescribed antiarch.

摘要： 记述了云南沾益地区下泥盆统穿洞组肺鱼化石一新种——多脊混磨鱼(Tarachomylax multicostatus sp. nov. ), 归入标本包括一件左上齿板、一块B骨、一块可能是3骨的骨片和6个零散鳞片。主要特征：齿板内侧及后侧边缘被小齿(denticles)覆盖；齿脊11—12列，齿板中缘与最后一列齿脊夹角约135。内翼骨侧凹不明显，后侧部窄小呈尖状；B骨和J骨上的前凹线沟相连；鳞片出露区与被覆压区之间有小齿瘤带。