Abundant conodonts occur in the Naqing section, southern Guizhou, South China, which has been selected as the candidate of the Carboniferous Kasimovian GSSP. Swadelina subexcelsa, Idiognathodus heckeli, I. turbatus and I. sagittalis, which are potentially index taxa for the Moscovian-Kasimovian boundary, are all recorded in the Naqing section. The lineages from their ancestors have been discussed in this paper, and furthermore, based on their lineages the conodont zonation is established for the global correlation. The provincialism of the Moscovian-Kasimovian boundary interval is also analyzed. The Tethyan and American Midcontinent provinces, can be identified to differentiate conodont faunas among major basins. The Tethyan Province can be further subdivided into the South China and Eastern European Platform subprovinces. By incorporating and evaluating varying aspects of the taxonomy, biostratigraphy and palaeobiogeography of the potential index taxa, I. heckeli might be the best marker for the base Kasimovian in term of its clear taxonomic definition and phylogenetic lineage, as well as its wide geographic range.

华南黔南那青段有丰富的牙形石，已被选为石炭纪卡西莫夫GSSP候选区。Swadelina subexcelsa , Idiognathodus heckeli , I . turbatus和我。矢状肌，它们是莫斯科-卡西莫夫边界的潜在索引分类群，都记录在纳庆剖面。本文讨论了它们祖先的谱系，此外，基于它们的谱系，牙形石分带建立了全局相关性。还分析了莫斯科-卡西莫夫边界区间的地方性。可以确定特提斯和美洲中部大陆省以区分主要盆地之间的牙形石动物群。特提斯省可以进一步细分为华南和东欧平台亚省。通过整合和评估潜在指标类群的分类学、生物地层学和古生物地理学的不同方面，I . 赫克利 就其明确的分类学定义和系统发育谱系以及广泛的地理范围而言，它可能是基础 Kasimovian 的最佳标记。