摘要
陡山沱藻Doushantuophyton Chen et Xiao是湖北秭归庙河埃迪卡拉系陡山沱组及安徽休宁埃迪卡拉系蓝田组中常见的种群,该属先后建立了5个种:D.lineare Chen et Xiao,1991;D.rigidulum,Chen1994;D.sinuolatum Hu,1996;D.quyuaniChen,Xiao and Yuan,1994,emend.Xiao et al.,2002和D.cometa Yuan et al.,1999。本文对贵州凯里组苗板坡剖面和乌溜-曾家崖剖面的30多块标本进行了详细描述,并与湖北庙河陡山沱组和安徽休宁蓝田组的陡山沱藻进行对比,结果表明,该属的模式种D.lineare Chen et Xiao和D.cometa Yuan et al.的时代可延伸到寒武纪第3世(原中寒武世)凯里生物群,并成为凯里生物群宏观藻类中的重要种群之一。也反映从埃迪卡拉纪陡山沱期至寒武纪第3世,经历了近5千多万年,特别是埃迪卡拉纪末期的生物灭绝事件,这2种的形态结构特征没有发生明显变化,说明陡山沱藻有些种具有较强的生存竞争能力以及遗传上的稳定性,从而表现出演化上的保守性和环境上的适应性。
Doushantuophyton Chen et Xiao （algae） is very common in the Ediacaran age Miaohe Biota and Lantian Flora, including five species, D. lineare Chen et Xiao, 1991; D. rigidulum Chen, 1994; D. sinuolatum Hu, 1996; D. quyuani Chen, Xiao and Yuan, 1994, emend. Xiao et al., 2002 and D. cometa Yuan et al. Among the species of Doushantuophyton, D. lineare Chen et Xiao and D. cometa Yuan et al. are found in the Cambrian age Kaili Biota and are important species in this area. The Genus spans a range of about 50 Ma from the Ediacaran Doushantuoian to Cambrian Epoch 3. Doushantuophyton Chen et Xiao, 1991 survived the extinction event of the terminal Ediacaran. Moreover, the characteristics of thallus morphology exhibit minimal change. Its survival probably indicates a wide ecological tolerance and flexibility and its conserved morphology may reflects a greater fitness for competition and a high degree of inherent genetic stability.
出处
《高校地质学报》
CAS
CSCD
北大核心
2010年第3期317-326,共10页
Geological Journal of China Universities
基金
国家自然科学基金项目(40672018)
国家创新研究群体科学基金项目(40621002)
国家973重大项目(2006CB804601)
贵州省科技特别基金(黔科机字[2007]4004)
深圳市仙湖植物园基金联合资助
