Sarcopterygians from the Lochkovian(Lower Devonian)of Nanning,Guangxi,China  

广西下泥盆统的肉鳍鱼类化石

作　　者：LI Mao-Kun CUI Xin-Dong ZHU Min QIAO Tuo 李懋坤;崔心东;朱敏;乔妥(中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室,北京100044;中国科学院大学,北京100049;北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京100871)

机构地区：[1]Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044 [2]University of Chinese Academy of Sciences,Beijing 100049 [3]Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871

出　　处：《古脊椎动物学报(中英文)》2025年第1期1-19,共19页Vertebrata Palasiatica

基　　金：国家自然科学基金(批准号:92255301);云南省张弥曼院士工作站(202205AF150002)资助。

摘　　要：Here we report a left cheek plate of Psarolepis,a postparietal shield of Youngolepis,a skull of Diabolepis,and a scale of Styloichthys from the Lianhuashan and Nahkaoling formations(Lochkovian,Lower Devonian)of Nanning,Guangxi.This marks the first report of Diabolepis and Styloichthys beside Qujing,Yunnan,and the latest occurrence of Psarolepis to date.The fossil community displays significant similarities to the Xujiachong Assemblage,and provides new data for the Lower Devonian stratigraphic correlation between southwestern China and northern Vietnam.Given the latest dating constraint based on the conodont evidence,we regard that the Xujiachong Assemblage has a much longer range than previously supposed,extending from the latest Lochkovian to the end of Pragian.We propose that the transition of the Nahkaoling and Lianhuashan formations in Nanning might correspond to the Guijiatun Formation in Qujing.The relatively large size of fish individuals from Guangxi is probably attributed to the increase in the oxygen content of the ocean.记述了广西南宁下泥盆统莲花山组和那高岭组中发现的早期肉鳍鱼类化石,材料包括一件斑鳞鱼(Psarolepis)的左侧颊板骨,一件杨氏鱼(Youngolepis)的后顶甲,一件奇异鱼(Diabolepis)的颅顶甲和一枚蝶柱鱼(Styloichthys)鳞片。其中颊板骨标本代表了目前已知最晚的斑鳞鱼化石记录,奇异鱼和蝶柱鱼标本则是这两个属在云南曲靖以外的首次报道。这些材料丰富了徐家冲组合的生物面貌,为广西、云南和越南北部下泥盆统的地层对比提供了重要化石证据。根据最新的牙形石证据,广西南宁地区的徐家冲组合可能最早在晚洛霍考夫期就已出现,比其他地区该组合的出现时间更早。广西南宁的莲花山组与那高岭组的过渡地层可能与曲靖地区的桂家屯组时代相当。同时,南宁地区的鱼类化石标本较云南曲靖地区的有明显大型化趋势,可能与当时南宁地区鱼类的生活环境中氧含量高有关。

关 键 词：Nanning Guangxi Lochkovian Lower Devonian Xujiachong Assemblage Lianhuashan Formation Nahkaoling Formation Sarcopterygians 

分 类 号：Q915.862[天文地球—古生物学与地层学]