鄂西奥陶系庙坡组短剑类化石新材料  

New Machaeridia materials from the Ordovician Miaopo Formation in western Hubei Province

作　　者：宋佳祺 孙智新 王凯 刘炳材 黄转丽 赵芊 薛岩 王美乐 闫绎纹 王文卉 方翔 SONG Jia-qi;SUN Zhi-xin;WANG Kai;LIU Bing-cai;HUANG Zhuan-li;ZHAO Qian;XUE Yan;WANG Mei-le;YAN Yi-wen;WANG Wen-hui;FANG Xiang(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;School of Ocean and Earth Science,Tongji University,Shanghai 200092,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China)

机构地区：[1]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,南京210008 [2]中国科学院大学,北京100049 [3]中南大学,地球科学与信息物理学院,长沙410083 [4]同济大学,海洋与地球科学学院,上海200092 [5]南京大学,地球科学与工程学院,南京210023

出　　处：《古生物学报》2024年第1期24-40,共17页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(42002009);中国地质科学院地质调查项目(DD20221829)联合资助。

摘　　要：短剑类(Machaeridia)属于环节动物(Annelida),其主要特征为个体微小且左右两侧对称,是一类相对稀少但是分布范围广泛的海相动物化石。在摩洛哥Anti-Atlas地区、中国华南、塔里木等地的奥陶系中皆有短剑类的报道,但是研究程度相对较低。本文报道并描述了产自湖北省远安县嫘祖剖面庙坡组的短剑类标本3枚,经初步鉴定为Plumulites sp. A (羽毛虫)和Lepidocoleus sp.(鳞鞘虫),这项发现拓展了短剑类在华南地区的时限和地理分布,也可看作是华南奥陶纪生物大辐射期间短剑类在扬子台地局部凹陷区域定居的反映。此外,本文还讨论了短剑类的形态特征和分类框架,认为早古生代的短剑类根据形态特征和骨片结构,可以划分为3科:羽毛虫科Plumulitidae Jell, 1979、鳞鞘虫科Lepidocoleidae Clarke, 1896、塔形壳虫科Turrilepadidae Clarke, 1896。Machaeridia is a poorly-known group of marine animals belonging to Annelida,and is characterized by a tiny,bilaterally symmetrical body.They are relatively rare,but widely distributed,and have been reported from the Ordovician System in Anti-Atlas of Morocco,South China,Tarim and some other regions.This paper reports and describes three specimens of Machaeridia from the Miaopo Formation at the Leizu section in Yuan'an County,Hubei Province.They are identified as Plumulites sp.A and Lepidocoleus sp.This finding expands the temporal and spatial distribution of Machaeridia in South China.These specimens represent the occurrence of Machaeridia in a shallow intra-platform depression during the Great Ordovician Biodiversification Event(GOBE).In addition,we discuss the morphological characteristics and classification of the Machaeridia,and propose that the early Paleozoic Machaeridia includes three families:Plumulitidae,Lepidocoleidae and Turrilepadidae.

关 键 词：嫘祖剖面 庙坡组 短剑类 羽毛虫科 鳞鞘虫科 塔形壳虫科 

分 类 号：K87[历史地理—考古学及博物馆学]