In traditional taxonomy, species are differentiated using morphological arguments, which can be subjective and cause confusion particularly when the initial species descriptions have been inadequate. The development of DNA‐based methods has provided more objective tools to recognize and quantify species differences, as well as enabled the detection of cryptic that is morphologically indistinguishable, species. Conversely, we show here that large‐scale, genome‐wide analysis of 11 427 loci and 65 825 SNPs is mostly unable to differentiate between many of the currently valid Palearctic species of bug‐killing parasitoid flies in the genus Gymnosoma Meigen (Diptera: Tachinidae), despite the proposed morphological differences. We conclude that alongside a few well‐defined taxa with discrete morphological features and unique DNA barcodes, Palearctic Gymnosoma is likely to contain a single, highly variable and geographically widespread species.

中文翻译：

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物种之间的细红线——Gymnosoma Meigen 的基因组分化，一种在分类学上具有挑战性的寄生蝇属（双翅目：Tachinidae）

在传统分类学中，物种是使用形态学参数进行区分的，这可能是主观的，尤其是在最初的物种描述不充分时会引起混淆。基于 DNA 的方法的发展提供了更客观的工具来识别和量化物种差异，并能够检测在形态上无法区分的神秘物种。相反，我们在此表明​​，对 11 427 个基因座和 65 825 个 SNP 的大规模全基因组分析大多无法区分 Gymnosoma Meigen 属（双翅目：Tachinidae )，尽管提出了形态差异。我们得出的结论是，除了一些具有离散形态特征和独特 DNA 条形码的明确分类群，