Early Cambrian phosphatized blastula- and gastrula-stage animal fossils from southern Shaanxi  

作　　者：HUAHong CHENZhe ZHANGLuyi 

机构地区：[1]KeyLaboratoryofContinentalDynamics,MinistryofEducation.NorthwestUniversity,Xi'an710069,China [2]NanjingInstituteofGeologyandPalaeontology,ChineseAcademyorSciences,Nanjing210008,China [3]Xi'anInstituteofGeologyandMineralResources.MinistryofLimdandResources,Xi'an710054,China

出　　处：《Chinese Science Bulletin》2004年第5期487-490,共4页

摘　　要：Marine invertebrate animal embryos and their early developmental products are of great significance to the study of taxonomy and phylogeny of early animals. A great number of phosphatized globular fossils were collected fromthe early Cambrian Kuanchuanpu Member (upper Dengying Formation), southern Shaanxi, and a nearly complete develo-pmental sequence—from a fertilized egg, via blastodisc formation, blastula development, blastodisc enlargement toward gastrulae, to tissue differentiation—can be discerned in this collection. This discovery provides unmatchable material for studies on the origin, taxonomy, radiation, and ontogeny of early metazoans.Marine invertebrate animal embryos and their early developmental products are of great significance to the study of taxonomy and phylogeny of early animals. A great number of phosphatized globular fossils were collected from the early Cambrian Kuanchuanpu Member (upper Dengying Formation), southern Shaanxi, and a nearly complete developmental sequence——from a fertilized egg, via blastodiscformation, blastula development, blastodisc enlargement toward gastrulae, to tissue differentiation——can be discerned in this collection. This discovery provides unmatcha-ble material for studies on the origin, taxonomy, radiation, and ontogeny of early metazoans.

关 键 词：寒武纪 动物化石 囊胚期 原肠胚期 

分 类 号：Q915.2[天文地球—古生物学与地层学]