贵州剑河寒武系杷榔组Occacaris的发现和意义  

OCCACARISFROM THE CAMBRIAN BALANG FORMATION,JIANHE COUNTY,GUIZHOU PROVINCE

作　　者：文荣琴 彭进[1] 刘帅[1] 梁博焱[1] 

机构地区：[1]贵州大学资源与环境工程学院,贵阳550025

出　　处：《古生物学报》2017年第3期271-281,共11页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(41672005;41172005;4133101);国家重点基础研究发展规划项目(973项目)(2013CB835002;2015FY310100-5);贵州省科学技术厅基金(黔科合Z字[2014]4003号);中国国家地层委员会基金联合资助

摘　　要：寒武纪海洋中的双瓣壳节肢动物耙肢虾Occacaris Hou,1999曾被报导出现在云南澄江生物群和贵州凯里生物群中,延续了一个相对短的地质时间。本文报道了在贵州省剑河县辣子寨村杷榔组中上部发现的Occacaris。杷榔组的Occacaris以壳背缘和前腹边缘呈大角度相交为特征,不同于澄江生物群和凯里生物群发现的背缘和前腹边缘交角均小于90°角的O.oviformis Hou,1999和O.magnus(Yao,2009),应为一新种,命名为O.lazizhaiensis sp.nov.。O.lazizhaiensis sp.nov.在贵州杷榔组的发现表明起源于云南寒武纪早期扬子地台浅水区的Occacaris,在寒武纪早中期开始向贵州较深水区的杷榔组迁移,延续进入时代较晚的凯里组,为适应生态环境的改变,出现了体构上较大的差异。杷榔组Occacaris的发现增加了Occacaris分类学、生态学、古地理分布和演化发育的新信息。Occacaris is a representative of bivalved arthropods that lived in the Cambrian seas, only occurring in the Chengjiang and Kaili biotas, undergoing a relatively short geological history. Here, we firstly report Occacaris from the Cambrian Balang Formation, Jianhe County, Guizhou Province. New material of Occacaris show a new morphological character different from those known in the Chengjiang and Kaili biotas, which has a large angle between the anterior dorsal line and anterior ventral margin, therefore, the new material is recognized as a new species. Here, we describe it as O. lazizhaiensis sp. nov. The occurrence of Occacaris from the Balang Formation indicates that this genus originally from shallow- water platform of Yunnan migrated to a deep-water shelf slope environment of the Balang Formation of Guizhou during the early Cambrian and ranges to the younger Kaili Formation in age. The new material from the Balang Formation provides additional information on Occacaris, including a taxon record, distribution of geography, ecologic environment and evolutionary trend.

关 键 词：Occacaris lazizhaiensis sp.nov. 杷榔组 寒武系 贵州 

分 类 号：Q915[天文地球—古生物学与地层学]