Abstract: The materials dealt with in this paper were collected from the Luolou Formation of Zuodeng area, Tiandong County of Guangxi Zhuang Autonomous Region, China (Figs. 1 ,2). They include three hybodontoid species: Hybodus zuodengensis (Yang et al., 1984), H. yohi (Yang et al., 1984) and Polyacrodus tiandongensis sp. nov., and an indeterminate osteichthyan fish. The two species of Hybodus were initially identified as conodonts — Pachycladina zuodengensis and Pseudogondalella yohi by Yang et al. in 1984. This is the first report on the occurrence of marine Early Triassic Hybodontoidea in China. With the reassignment and new discovery of these fishes, a fish assemblage (Hybodus zuodengensis-H. yohi Zone) is established, which is the only Triassic fish zonation in China. The age of this zonation is Early Triassic (early Spathian of Olenekian Stage) for it makes its appearance just in the conodont Neospathodus homeri-N. t riangularis Zone.

摘要： 广西田东县作登下三叠统罗楼组产出弓鲛鱼类:作登弓鲛Hybodus zuodengensis ( Yang et al. ) 、乐氏弓鲛H. yohi ( Yang et al. ) 和田东多尖齿鱼(新种) Polyacrodus tiandongensis sp. nov. , 其中前二种化石以前曾被作为牙形类报道。这是弓鲛鱼类在中国海相早三叠世的首次报道。另外,本组还产出属种未定的硬骨鱼类化石(Osteichthyes gen. et sp. indet . ) 。建立了我国海相早三叠世第一个鱼类带化石