贵州东部寒武纪黔东世杷榔组腕足动物的新材料  

NEW MATERIAL OF BRACHIOPODS FROM THE QIANDONGIAN(LOWER CAMBRIAN) BALANG FORMATION,EASTERN GUIZHOU,SOUTH CHINA

作　　者：彭进[1,2] 赵元龙[1] 秦琴[1] 闫旭[1] 马海涛[1] 

机构地区：[1]贵州大学资源与环境工程学院,贵阳550003 [2]现代古生物学和地层学国家重点实验室,南京210008

出　　处：《古生物学报》2010年第3期365-379,共15页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(40762001;40672018);贵州省国际科技合作重点项目(黔科合外"G"字2008:700110);贵州省科技特别基金(黔科机字200724004);国家重点基础研究发展规划项目(2006CB806401);现代古生物学和地层学国家重点实验室基金(083107);深圳市仙湖植物园基金联合资助成果

摘　　要：贵州寒武纪黔东世杷榔组腕足动物由3属3种组成,其中含2新种,均属舌形贝亚门,包括舌形贝类的Lingulellotreta malongensis(Rong,1974)、博茨傅徒贝类的Diandongia circularis sp.nov.和隐孔贝类的Askepasma transversalis sp.nov.。化石产自黔东地区凯里市、剑河交榜、台江革一等地杷榔组中Arthricocephalus chauveaui-Changaspis elongata三叶虫组合带。杷榔组腕足动物组合与云南黑林铺组和乌龙箐组腕足动物组合较为相似,均含有舌形贝类、博茨傅徒贝类和神父贝类的代表。起源于早寒武世筇竹寺期的Lingulellotreta malong-ensis不仅延伸进入了沧浪铺期,还出现在较深水的陆棚斜坡环境,其演化在区域和时代分布上具有一定的继承性。杷榔组Diandongia circularis sp.nov.的发现是云南早寒武世Diandongia腕足动物辐射演化适应更宽环境的结果。Askepasma Laurie,1986仅见于澳大利亚中部Amadeus盆地Todd河早寒武世白云岩中,杷榔组该属化石的发现,可扩展其地理分布,增加该属动物分类学的新信息。Brachiopods from the Cambrian （Qiandongian：Lower Cambrian） Balang Formation consist of 3 species （2 new species）,referred to 3 genera （Lingulata,Linguliformea）.The brachiopod assemblage comprises the lingulid Lingulellotreta malongensis（Rong 1974）,the botsfordiid Diandongia circularis sp.nov.and the cryptotretid Askepasma transversalis sp.nov.The Brachiopod fauna is located in the Arthricocephalus chauveaui-Changaspis elongata Assemblage Zone of the Balang Formation.The brachiopod assemblage from the Balang Formation is similar to that of the Heilinpu and Wulongjin formations of the Lower Cambrian from Eastern Yunnan,China.The Heilinpu,Wulongjin and Balang formations all contain abundant Lingulellotreta malongensis and Diandongia.Lingulellotreta malongensis originally described from the Chiungchssuan age （Early Cambrian） not only ranges into Tsanglangpuan age but also occurs in deeper water environments of the shelf-slope,on which the Balang Formation was deposited.Among these taxa,Lingulellotreta malongensis has an unique time-spatial distribution.The discovery of Diandongia circularis sp.nov.in the Balang Formation indicates radiation of the Early Cambrian Diandongia into to a broader ecological environments.Previously,Askepasma Laurie,1986 had only been reported in the Early Cambrian Todd River dolomite,in the Amadeus Basin of central Australia.The discovery of Askepasma in the Balang Formation extends its geographical distribution and provides additional taxonomic information on the taxon.Together,these new findings from the Balang Formation provide additional information on the taxonomy and geographic distribution of brachiopod faunas in the Early Cambrian of Guizhou,South China.

关 键 词：腕足动物 杷榔动物群 杷榔组 黔东统(下寒武统) 贵州 

分 类 号：Q915[天文地球—古生物学与地层学]