Abstract:

The macroscopic algae fossils from Shibantan bituminous limestone of Dengying Formation in the Xiadong area, Hubei province were studied. There are one genus and three species (including two new species) and one new macroscopic algae fossils with monopodial branching character (genus and species are unidentified) from the Sixi section. Monopodial-branching type fossil represents the first macro-algae fossil with the monopodial branching discovered in the terminal Ediacaran Dengying and equivalent formations in South China. Vendotaenia sixiense new species and Vendotaenia pavimentpes new species are the algae fossils with branching and holdfast, respectively. The new discovery suggests that the morphology of macroscopic algae fossils might be more complex than previous think, and has the great significance to the evolution research of the early multicellular macroalgae.

Key words: macroscopic algae, monopodial branching, Dengying Formation, Ediacaran

摘要：

通过连续显微拍摄,对来自湖北峡东地区泗溪剖面灯影组石板滩段薄层泥质沥青灰岩中的宏体藻类化石开展详细研究,鉴定出1属3种(包括2个新种)和一种首次发现的具有单轴分枝特征的宏体藻类化石(未定属种)。以Monopodial-branching型化石和Vendotaenia paviment- pes为代表的具单轴分枝性状和固着装置的藻类化石在华南灯影组地层中的首次发现, 说明灯影期宏体藻类分枝、固着器等重要性状并没有消失。研究结果丰富了峡东地区埃迪卡拉纪末期后生藻类的多样性, 对探讨多细胞藻类的演化具有重要的意义。

关键词: 宏体藻类, 单轴分枝, 灯影组, 埃迪卡拉纪