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
赵晓芳 1郭俊锋 1贠浩 2宋祖晨 1强亚琴 1彭佳欣 1张博耀 1孙洁1
作者信息
- 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
- 折叠
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,Chancelloriasp.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.
Abstract
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.Well-preserved 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Key words
chancelloriids/attachment structures/Tianzhushan Member/Terreneuvian/Three Gorges area引用本文复制引用
基金项目
国家自然科学基金项目(42172016)
陕西省自然科学基金(2024JC-YBMS-231)
出版年
2024
NETL
NSTL
万方数据