贵阳奥陶系湄潭组海林檎Hemicosmitoid和Glyptocystitoid多样性及古地理分布  

Diversity and Paleogeographic Distribution of Hemicosmitoid and Glyptocystitoid in Ordovician Meitan Formation of Guiyang

作　　者：李佳乐 兰天 王约[1] Li Jiale;Lan Tian;Wang Yue(College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,贵阳550025

出　　处：《吉林大学学报（地球科学版）》2023年第5期1380-1390,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41902003)。

摘　　要：棘皮动物是最原始的动物门类之一,其多样性及古地理分布对于研究多细胞动物的起源和早期演化至关重要。本文对贵阳乌当地区湄潭组棘皮动物化石进行整理,进行了系统古生物学鉴定,并统计了奥陶纪海林檎属种的古地理分布情况。结果表明:其萼板来自于海蕾亚门(Blastozoa)孔菱海林檎目(Rhombifera)中的雕刻海林檎超科(Glyptocystitoida)和半海林檎超科(Hemicosmitoida),奥陶纪海林檎存在湄潭组Polycosmites和Macrocystella属。这一发现增加了海林檎化石的新地点和新层位记录,扩大了其在扬子板块的层位和生物古地理分布范围,同时也揭示了贵阳乌当地区棘皮动物的多样性,提供了早奥陶世棘皮动物辐射演化的新信息。Echinoderms is one of the most primitive animal groups,and its evolutionary history is crucial for understanding the origin and early evolution of multicellular animals.In this paper,some echinoderm fossils,collected from the Meitan Formation in Wudang area of Guiyang,are identified as thecal plates of the Glyptocystitoida and Hemicosmitoida in the Rhombifera,belonging to Polycosmites and Macrocystella.We also conduct a study of the Ordovician paleogeographic distribution of the two superfamilies,and find that the presence of Polycosmites and Macrocystella in the Meitan Formation expands the biogeographic distribution of the two genera in Yangtze plate.At the same time,this discovery reveals the diversity of echinoderms in Wudang area,and provides new information on the evolutionary radiation of echinoderms during the Early Ordovician.

关 键 词：棘皮动物 湄潭组 奥陶纪 古地理 贵阳 

分 类 号：P52[天文地球—古生物学与地层学]