The DNA-barcoding and chromosomal study of the eastern water bat, Myotis petax Hollister, 1912, from the earlier unexplored localities in the Russian Far East are carried out. The COI barcoding obtained for 18 from a total of 19 individuals captured in five localities in the Russian Far East showed the low nucleotide variability with the prevalence of the central, the most abundant haplotype. The chromosomal characteristics of eight M. petax specimens (2n = 44, NFa = 52) in the Russian Far East are clarified. The number and localization of NOR in karyotype of M. petax is described at the first time and differ from distributional patterns of NOR in the sibling species M. daubentonii Kuhl, 1819 that can be used as diagnostic feature. The considerable intraspecific variability in the distribution of heterochromatin material revealed is not typical of the genus Myotis, but it has been found in other species of the family Vespertilionidae.

中文翻译：

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DNA 条形码和有关俄罗斯远东地区鼠耳蝠（翼手目、鼠蝠科）核型的新数据

对来自俄罗斯远东地区早期未开发地区的东部水蝠 Myotis petax Hollister，1912 年进行了 DNA 条形码和染色体研究。从俄罗斯远东地区 5 个地点捕获的总共 19 个人中获得的 18 个人的 COI 条形码显示，核苷酸变异性较低，且中心、最丰富的单倍型普遍存在。阐明了俄罗斯远东地区 8 个 M. petax 标本（2n = 44，NFa = 52）的染色体特征。首次描述了 M. petax 核型中 NOR 的数量和定位，与兄弟物种 M. daubentonii Kuhl, 1819 中 NOR 的分布模式不同，可用作诊断特征。所揭示的异染色质物质分布的相当大的种内变异性在鼠耳蝠属中并不典型，但在鼠耳蝠科的其他物种中也发现了这种情况。