中文摘要：

文中详细介绍发现于我国贵州瓮安和峡东地区陡山沱组的管状微体化石Ramitubus increscens,R.de-crescens,Crassitubus costatus,Sinocylocyclicus guizhouensis,Quadratitubus orbigoniatus和Yangtzitubus semiteres等5属6种。以往,虽然对这些化石的亲缘关系有不同的认识,但大部分学者均认为这是一类后生动物化石;特别是刺丝胞动物床板珊瑚类的学术观点,更是得到多数学者的支持。文中根据管状微体化石的形态特征、分枝特点及其内部构造,对此类化石的古生态特征、生物属性和地层学意义进行详细讨论。指出具有分枝特征的Ramitubus确为底栖固着生活类型,目前将其亲缘关系解释为床板珊瑚类是合适的;但不具分枝特征的Crassitubus,Sinocy-locyclicus和Quadratitubus的古生态特征尚不清楚,虽然它们与Ramitubus大小相近,形态相似,但现有的形态学特征似乎更支持将此类化石可与丝状蓝菌联系起来。此外,Sinocylocyclicus和Quadratitubus在贵州瓮安和峡东地区均有稳定的产出层位,似乎显示出这两个属具有生物地层对比的潜力,但两地的产出层位中所共生的化石内容相差较大,因此,两属的地层学意义尚需进一步考证。

英文摘要：

This paper reviewed the tubular microfossils in some detail from the Ediacaran Doushantuo Formation in central Guizhou Province and Yangtze Gorges.These fossils include five form genera and six species types.They are Ramitubus increscens,R.decrescens,Crassitubus costatus,Sinocylocyclicus guizhouensis,Quadratitubus orbigoniatus and Yangtzitubus semiteres.All these fossils have been interpreted as metazoan fossils,especially cnidarian tabulate corals by most researchers,though some researchers considered that these fossils may be related to algae or huge filamentous cyanobacteria.Based on new material and more mophological analyses,it is suggested that the living mode of Ramitubus （with dichotomous branching） might have been benthonic colony,indicating a tabulate coral affinity of Ramitubus is reasonable.However,shapes and inner structures of Crassitubus,Sinocylocyclicus and Quadratitubus indicate that they are more similar to filamentous cyanobacteria.In addition,the stratigraphic significance of tubular microfossils is not clear though both genera Sinocylocyclicus and Quadratitubus occur at a stable stratigraphic horizon in Weng＇an,Guozhou Province and in Yangtze Gorges.