三峡地区松林坡剖面寒武系纽芬兰统天柱山段开腔骨类化石及其微细结构  

CHANCELLORIID SCLERITES WITH THE WELL-PRESERVED MICROSTRUCTURES FROM THE CAMBRIAN TERRENEUVIAN TIANZHUSHAN MEMBER AT THE SONGLINPO SECTION OF THE THREE GORGES AREA

作　　者：赵晓芳 郭俊锋[1] 贠浩 宋祖晨 强亚琴 彭佳欣 张博耀 孙洁 ZHAO Xiaofang;GUO Junfeng;YUN Hao;SONG Zuchen;QIANG Yaqin;PENG Jiaxin;ZHANG Boyao;SUN Jie(Key Laboratory of Western Mineral Resources and Geological Engineering,Ministry of Education,School of Earth Science and Resources,Chang'an University,Changan University,Xi'an 710054;Shaanxi Key Laboratory of Early Life and Environments and State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Northwest University,Xi'an710069)

机构地区：[1]西部矿产资源与地质工程教育部重点实验室,长安大学地球科学与资源学院,西安710054 [2]陕西省早期生命与环境重点实验室,西北大学地质学系,西安710069

出　　处：《微体古生物学报》2024年第2期93-104,共12页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金项目(42172016);陕西省自然科学基金(2024JC-YBMS-231)资助。

摘　　要：本文报道了湖北宜昌松林坡剖面寒武系纽芬兰统天柱山段开腔骨类骨片化石Chancelloria cf.eros,Ch.irregularis,Chancelloria sp.和Cambrothyra ampulliformis等2属3种及一个未定种。一些骨片的基面上保存了呈同心圆状规则分布于基孔周围的凹坑状微细结构,该结构与软舌螺口盖肌肉附着结构的大小、形态极为相似,很可能代表了开腔骨类骨片的原生附着结构,起到辅助骨片和软体体壁连接的作用。因此,开腔骨动物很可能具有从表皮组织分化的表皮肌细胞,这证明开腔骨类应属于具表皮的基础真后生动物,而非海绵或海绵级别的动物类群。Abundant chancelloriid sclerites were collected from the Cambrian Terreneuvian Tianzhushan Member at the Songlinpo section of Yichang,Hubei Province.They are classified into 2 genera,3 species and an indeterminated species,including Chancelloria cf.eros,Ch.irregularis,Chancelloria sp.,and Cambrothyra ampulliformis.Wellpreserved pits microstructure can be observed on the basal facet of some sclerites,which is concentrically and regularly distributed around the foramen of each sclerite ray.The pits microstructure is morphologically similar to the muscle attachment structure on the hyolith operculum.Therefore,such microstructure is probably related to the attachment sites of the primary epithelial muscle cells of the epidermis and may make a steady connection between the sclerites and the soft body wall of chancelloriids,which further indicates that chancelloriids are the basal epitheliozoans rather than the sponge or sponge-grade metazoans.

关 键 词：开腔骨类 附着结构 天柱山段 纽芬兰统 三峡地区 

分 类 号：Q915.2[天文地球—古生物学与地层学]