埃迪卡拉纪是新元古代最后一个纪,是新元古代雪球地球事件与寒武纪生命大爆发之间地质历史最重要的转折时期,在研究地球早期生命演化方面具有举足轻重的地位。我国华南三峡地区埃迪卡拉系陡山沱组中下部的地层中,发现了大量的以具刺疑源类为主的微体化石,其中有两个形态简单、分布广泛的类型——分别是以光面、球状为特征的Leiosphaeridia和光面囊胞状、具开裂特征的Schizofusa。本文通过对这两种化石材料的细致观察与统计,对两者间的亲缘关系进行了详细探讨,认为Schizofusa开裂之前应为光面球体,即Schizofusa是某些光面球的发展演化后期阶段。 Eddie Kaji is the last Neoproterozoic epoch, the most important turning point in the geological history between the Neoproterozoic snowball events and the Cambrian explosion, and plays an important role in studying the evolution of early Earth life. In the strata of the middle and lower part of the Doushantuo Formation of the Edicala Formation in the Three Gorges area of ​​China, a large number of microfossils are found mainly in the areas of predatory source, of which two are simple and widely distributed types Leiosphaeridia, a smooth, globular, and Schizofusa, a smooth cystic, dehiscing character. Through detailed observation and statistics on these two kinds of fossil materials, this paper discusses the genetic relationship between them in detail, and thinks that Schizofusa should be a smooth sphere before cracking, that is, Schizofusa is the late stage of evolution of some smoothballs.