Five Liphistius Schiödte, 1849 species of the primitively segmented spider family Liphistiidae are currently known from Myanmar. Here, we described a new species, Liphistius pyinoolwinsp. nov. (♂♀), which was collected from Pyin Oo Lwin, Mandalay Region, Myanmar, diagnosed based on its genital morphology. The specimens (2♂♂, 5♀♀) collected by Walter C. Sedgwick from Pyin Oo Lwin in 1982 were misidentified as L. birmanicus Thorell, 1897 and are treated here as the newly described species. Accordingly, we described the males of L. birmanicus for the first time, redescribed its female, using newly collected specimens from Yadò, Than Taung and Kalekho Atet townships, Kayin State. We also provided information on the variation in genital morphology of both species, and their relationships within the birmanicus-group of species.

中文翻译：

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来自缅甸的新种 Liphistius 和 L. birmanicus Thorell 实际雄性的描述，1897 年（Araneae、Mesothelae、Liphistiidae）

五种 Liphistius Schiödte，1849 种原始分节蜘蛛科 Liphistiidae 目前在缅甸已知。在这里，我们描述了一个新物种 Liphistius pyinoolwinsp。十一月 (♂♀)，采自缅甸曼德勒地区的彬乌伦，根据其生殖器形态进行诊断。Walter C. Sedgwick 于 1982 年从彬乌伦采集的标本 (2♂♂, 5♀♀) 被误判为 L. birmanicus Thorell, 1897，这里作为新描述的物种处理。因此，我们第一次描述了 L. birmanicus 的雄性，重新描述了它的雌性，使用了从 Kayin 州 Yadò、Than Taung 和 Kalekho Atet 镇新收集的标本。我们还提供了关于两个物种生殖器形态变化的信息，以及它们在 birmanicus 物种群中的关系。