NEW MOSCOVIAN IDIOGNATHODUS(CONODONT,PENNSYLVANIAN)SPECIES FROM THE NAQING SECTION,GUIZHOU,SOUTH CHINA  

华南贵州纳庆剖面宾夕法尼亚亚纪莫斯科期牙形类Idiognathodus属新种

作　　者：HU Keyi QI Yuping WEI Shengze 胡科毅;祁玉平;魏胜泽(关键地球物质循环与成矿全国重点实验室,南京大学地球科学与工程学院,南京210023;古生物学与油气地层应用全国重点实验室,中国科学院南京地质古生物研究所,南京210008)

机构地区：[1]State Key Laboratory of Critical Earth Material Cycling and Mineral Deposits,School of Earth Sciences and Engineering,Nanjing University,163 Xianlin Avenue,Nanjing 210023,China [2]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《微体古生物学报(中英文)》2025年第1期30-41,共12页Acta Micropalaeontologica Sinica

基　　金：supported by the National Natural Science Foundation of China(grant No.42172002).

摘　　要：The conodont genus Idiognathodus is one of the most important taxa in Pennsylvanian biostratigraphy.However,numerous unnamed species prevent us from understanding the evolutionary history of the genus and lower the potential of Idiognathodus species in the biostratigraphic correlation.New species I.anteparallelus sp.nov.,I.prosonimius sp.nov.,and I.zhuotingi sp.nov.from the Naqing section,southern Guizhou,South China are systematically described in this paper.The three new species are short-ranging taxa found in the I.podolskensis to Swadelina sp.A zones of the middle−late Moscovian.They are characterized by symmetrically paired P1 elements with a long carina,loosely space transverse ridges,and restricted accessory lobes,which are not commonly seen in the coeval I.podolskensis group.By gradually modifying adcarinal ridges,the three species constitute an evolutionary lineage.In addition,based on the new conodont data and hypotheses proposed by other researchers previously,the early evolution of the genus Idiognathodus is also discussed briefly.Species assigned to the genus Idiognathodus currently may be a polyphyletic group that evolved from different ancestors in the Bashkirian.牙形类Idiognathodus属是宾夕法尼亚亚纪生物地层学中最重要的分类单元之一。然而由于该属中存在大量未命名的种,我们对该属的演化历史了解有限,同时也降低了该属分子在生物地层对比中的潜力。本文对产自华南贵州纳庆剖面的新种I.anteparallelus sp.nov.,I.prosonimius sp.nov.和I.zhuotingi sp.nov.进行了系统描述。这三个新种延限较短,位于莫斯科期中晚期的I.podolskensis到Swadelina sp.A带中。它们的特征为:P1分子镜像对称,具较长的隆脊,宽间距的横脊和受限的齿叶,这些特征在同时期的I.podolskensis类群中并不常见。通过前缘脊形态的逐渐演变,这三个种构成了一个演化谱系。基于这一新发现,结合其他学者之前提出的假说,本文还简要讨论了Idiognathodus属的早期演化,认为当前被划分到Idiognathodus属的物种可能是一个多系群,它们源自巴什基尔期的不同祖先。

关 键 词：CONODONTS Idiognathodus new species Moscovian CARBONIFEROUS South China 

分 类 号：Q915[天文地球—古生物学与地层学]