峡东寒武纪第二期三管缠绕形壳Anabarites cf.tripartitus的螺旋手性  

Spiral chirality of three-lobes helical tube Anabarites cf.tripartitus from Cambrian Age 2 in Three Gorges area

作　　者：彭佳欣 赵晓芳 郭俊锋[1,2] 强亚琴 宋祖晨 孙洁 韩健[2] PENG Jiaxin;ZHAO Xiaofang;GUO Junfeng;QIANG Yaqin;SONG Zuchen;SUN Jie;HAN Jian(Key Laboratory of Western Mineral Resources and Geological Engineering,Ministry of Education,School of Earth Science and Resources,Chang'an University,Xi'an,Shaanxi 710054,China;Shaanxi Key Laboratory of Early Life and Environments and State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an,Shaanxi 710069,China)

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

出　　处：《地质学报》2024年第7期2025-2040,共16页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号42172016,41890844);国家重点研发计划(编号2023YFF0803601);中国科学院战略性先导科技专项(B类)项目(编号XDB26000000);现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放基金项目(编号203106)联合资助的成果。

摘　　要：在现生生物和化石记录中螺旋手性十分常见,然而,其发生机制一直悬而未决,尤其是寒武纪早期小壳化石。阿纳巴管类(anabaritids)是一类广布于寒武纪纽芬兰世地层中呈明显三辐射对称的管状化石,前人对该类化石中螺旋扭转属种的研究大多仅限于形态描述,其手性机制讨论甚少。本文依托湖北宜昌寒武系纽芬兰统岩家河组中111枚右手螺旋手性的小壳化石——Anabarites cf.tripartitus,探讨该类化石右手螺旋模式生长机制,认为螺旋扭转原因并非外部环境所致(水流变化、埋藏作用、科里奥利力),而应从生物自身因素(功能形态学、分子发育生物学)出发探究其固定的右旋不对称性机制。Helical chirality is a widespread phenomenon observed in both extant organisms and the fossil record.Despite its prevalence,this phenomenon has received comparatively little attention in scientific research,especially in the context of small shelly fossils from the Early Cambrian.Anabaritids,a group of tubular fossils exhibiting distinctive triradial symmetry,are known from the Early Cambrian strata worldwide.Previous studies on some helical anabaritid species have mostly focused on morphological descriptions,with the underlying causes for their helical chirality remaining largely unexplored.This study examines the mechanism responsible for the fixed right-handed(dextral)spiral chiralityobserved in Anabarites cf.tripartitus,based on an analysis of 111 specimensobtained from Member 5 of the Yanjiahe Formation(Cambrian Stage 2)in the Three Gorges area of Hubei Province,China.The cause of right-handed helical chirality should be inferred from the perspective of molecular genetics,considering biological factors(e.g.,functional morphology,molecular developmental biology)instead of external environmental factors(e.g.,water change,taphonomy,Coriolis force).

关 键 词：螺旋手性 功能形态学 分子发育生物学 Anabarites cf.tripartitus 寒武系第二阶 

分 类 号：P534.41[天文地球—古生物学与地层学] Q911.2[天文地球—地质学]