晚元古代早期淮南生物群中蠕虫状化石的生物学特性研究

3Abstract: During the researches, 6 new genera characterized by the three-dimensional preserved Huaiheina, Moltinodus, Solidimura and other worms and new trace fossils types characterized by the Monilichnus were found. A major breakthrough has been acquired on the studies of the ultramicro tissues of the worms.and the megascopic alga. So it was proved that some worm-like fossils are surely the high-class metazoan worms according to the differences of the cellular compositions and the structural systems between the worms and the megascopic alga, combined.with their macro-mophological functions, behaviors and the correlative trace characters. The depositional age of the strata, in which such fossils were preserved,.was younger than 900Ma but older than 700Ma according to the isotopic characters and the geochronology of isotopes Sr and C. Most of the research findings could be used to emend the hypothesis that the metazoan origin was later than the last Neoproterozoic glaciation, which occurred about 700Ma ago. So the old hierarchy patterns, which had been established to describe the origin and the evolving process of.the metazoan, should be renewed and emended on the basis of the latest research findings on the metazoan belong to the Huainan Period and the Pre-Huainan Period.Especially, it should be pointed out that the worm-like fossils in the Huainan Biota, exhibited a relatively high level of lives after a long period of life evolution, on the basis of the characters of their tissue structures, morphological functions and behaviors. So it suggested that there should have existed a long period of evolving.process of lives before the life explosion of the Huainan Biota (or.the Huainan Period). And more thorough quests need to be carried out.

采用生态特征与形态功能分析法、遗迹化石与生物化石关系追踪法及碳质化石剖析法等，研究蠕虫状化石生物的古生态特征及其行为习性规程以及其宏观特征与组织结构之间的对应关系，揭示其生物学特征，论证其组织结构发展水平，探讨其在生物演化史中的地位。此项研究，对于揭示地球早期生命的发生发展特征及其演化规律等，都具有重要的理论意义。.