陕南西乡生物群早寒武世Quadrapyrgites化石  

Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province

作　　者：刘云焕[1,2] 邵铁全[1] 段少帅[1] 胡厚攀[1] 白佳[1] 张文娟[1] 杨飞[1] 张宁[1] 李秀敏[1] 任萌[1] 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室,江苏南京210008

出　　处：《地球科学与环境学报》2013年第3期39-43,共5页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(41072012);中央高校基本科研业务费专项资金项目(CHD2012ZD017);现代古生物学和地层学国家重点实验室开放课题(113115);西部矿产资源与地质工程教育部重点实验室项目;长安大学第八届“挑战杯”大学生课外学术科技作品组委会项目

摘　　要：早寒武世早期梅树村期生物类群大规模辐射,身体构型快速革新,形成与前寒武纪生物群明显不同的面貌。最近在陕南西乡县张家沟发现了大量下寒武统宽川铺组的微骨骼化石,其中以产出大量不同成长阶段的刺细胞动物——四方塔形壳Quadrapyrgites和其他大量形态特异的微骨骼化石为特色,据此建立西乡生物群。基于此,对四方塔形壳生长模式进行了讨论,并对Quadrapyrgites个体演化序列进行了完善。双胚层刺细胞动物的出现,标志着地球生命史的真后生动物演化开端,在生物起源演化历程中占据着关键位置。陕南西乡生物群Quadrapyrgites及其他微骨骼化石的大量获得,为研究真后生动物起源演化、体型构建提供了丰富的实证材料。The Meishucun stage is a crucial interval in Cambrian explosion, when an evolutionary radiation and innovation of eumetazoa bauplan took place. Recently, a large number of small shelly fossils （SSF） from Kuanchuanpu Formation of Lower Cambrian were discovered in Zhangjiagou of Xixiang county, southern Shaanxi province. A lot of cnidarias in different stages including square pyramid-sharp shell Quadrapyrgites and other small shelly fossils with different morphologies were developed, so a new boita ＂Xixiang Boita＂ was established. The growth model for square pyramid-sharp shell was discussed, and individual evolutionary sequence was improved. The results show that the appearance of diploblastic cnidaria marks the beginning of eumetazoa evolutionary, and it is important for the origin and evolutionary of organisms. Quadrapyrgites fossil and other small shelly fossils in Xixiang Boita of southern Shaanxi province provide new evidence for studying the origin, evolution and bauplan of eumetazoa.

关 键 词：西乡生物群 早寒武世 宽川铺组 微骨骼化石 刺细胞动物 个体演化序列 

分 类 号：Q913.2[天文地球—古生物学与地层学]