Conodont assemblages from the Bashkirian–Moscovian boundary interval in the Naqing section, South China have been studied in detail. A landmark‐based geometric morphometric analysis of the evolution of Diplognathodus ellesmerensis is presented. This analysis helps demonstrate that a distinct new species, D. benderi sp. nov., is the direct evolutionary ancestor of D. ellesmerensis. The potential of using the first appearance datum (FAD) of D. ellesmerensis as the Bashkirian–Moscovian boundary marker is re‐evaluated via biostratigraphic correlations of conodonts and other fossil groups between different palaeogeographical basins. The FAD of D. ellesmerensis from within the D. benderi sp. nov.–D. ellesmerensis lineage is an excellent potential marker to recognize a global Bashkirian–Moscovian boundary because of its global distribution, the abundance of supplementary marker species at similar stratigraphical levels, and the close stratigraphic proximity of the FAD to the traditional Bashkirian–Moscovian boundary, thus largely preserving the original concept of the base of the Moscovian Stage.

中文翻译：

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D. benteri sp。的牙形梁Diplognathodus ellesmerensis的进化。十一月 在华南的Bashkirian-Moscovian（宾夕法尼亚州中下部）边界

已经详细研究了华南那庆地区Bashkirian-Moscovian边界区间的牙形石组合。提出了一种基于地标的双翅目昆虫进化的几何形态计量学分析。该分析有助于证明独特的新物种D. benteri sp.。nov。，是D. ellesmerensis的直接进化祖先。通过不同古地理盆地之间牙形石和其他化石群的生物地层学相关性，重新评估了使用D. ellesmerensis的首次出现数据（FAD）作为Bashkirian-Moscovian边界标记的潜力。D. bendrieri内部的ellesmerensis FADsp。11月– D. ellesmerensis谱系是公认的全球Bashkirian-Moscovian边界的极佳潜在标志物，因为其全球分布，地层水平相似的补充标志物种类丰富，以及FAD与传统Bashkirian-Fashion地层接近莫斯科边界，因此在很大程度上保留了莫斯科舞台基础的原始概念。