贵州剑河八郎寒武系清虚洞组拜如尼亚虫Byronia Mathew,1899的发现

摘要

剑河八郎松山寒武系黔东统都匀阶清虚洞组主要由泥岩、灰岩组成,下部以灰岩为主,上部为泥岩、灰岩互层,顶部为中层白云岩.上部含有大量的莱德利基虫类、耸棒头虫类和褶颊虫类三叶虫及带软躯体动物多门类化石.本文报道的拜如尼亚虫Byronia Mathew,1899产于清虚洞组中部及中上部,分异度低,仅1属1相似种,即原生拜如尼亚虫(相似种)Byronia cf.annulata Liu,1986.原生拜如尼亚虫(相似种)Byronia cf.annulata化石保存较好,管壁保存有横脊.剑河八郎松山清虚洞组的拜如尼亚虫是贵州杷榔组和凯里组之后另一个产出层位,它的发现不仅丰富了清虚洞组生物群的组成,同时亦为贵州乃至全球寒武系拜如尼亚虫Byronia的演化、埋藏特征等研究提供了新的素材.%The Tsinghsutung Formation (Qiandongian Series,Cambrian) of Songshan Section near Balang village,Jianhe County,Guizhou Province is mainly composed of mudstone and limestone,interbeded by mudstone and limestone at the upper part and topped by middle layer of grayand dolomite.The upper part of Tsinghsutung Formation is rich in Redlichiaids,Ptychopariids,Oryctocephalids,soft-body fossils and other phyla.So far only 1 species,Byronia cf.annulata Liu,1986 has been found in the middle and middle-upper part of Tsinghsutung Formation.The Byronia fossils described in this paper are well preserved and even the transverse ridges on the wall tube can be identifiable.These fossils not only enrich the assemblage of Tsinghsutung Formation biota,but also provide new materials for taphonomy,as well as the systematic evolution of the Early Cambrian Byтonia's in China.