The micro land snail genus Diplommatina (family Diplommatinidae) is widely distributed in Southeast Asia and includes many endemic species. Three new species of Diplommatina are described from Satun Province in southern Thailand. Diplommatina bulonensissp. nov., D. laemsonensissp. nov. and D. prakaiphetensissp. nov. are distinguished from other species in the genus by their shell size and shape, the number of radial ribs on the penultimate whorl, the number of whorls, and features of the peristome. The agreement between phylogenetic tree based on analyses of COI and 16S sequences and comparative morphology support the delineation of these new species which, when compared to related species, belong to well-differentiated clades. The K2P distance between any of the three new species and other Diplommatina species included in the molecular phylogenetic analysis was at least 5.5% in COI and 3.9% in 16S. Two of the three new species (D. prakaiphetensissp. nov. and D. bulonensissp. nov.) are apparently endemic to Prakaiphet Hill and Bulon Pai Island, respectively. Additionally, we documented a new regional record for D. naiyanetri in Satun Province. These new species and records contribute to the knowledge of Thailand’s land snail biodiversity and highlight the need of conservation protections for regional karst habitats.

中文翻译：

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泰国沙敦府陆生蜗牛属 Diplommatina Benson, 1849 (Caenogastropoda, Diplommatinidae) 三个新种的首次记录和描述

微型蜗牛属 Diplommatina（Diplommatinidae 科）广泛分布于东南亚，包括许多地方性物种。泰国南部沙敦府描述了三种新的 Diplommatina。Diplommatina bulonensissp。十一月，D. laemsonensissp。十一月 和 D. prakaiphetensissp。十一月 与该属中的其他物种的区别在于它们的壳大小和形状、倒数第二个螺纹上的径向肋的数量、螺纹的数量和唇的特征。基于 COI 和 16S 序列分析的系统发育树与比较形态学之间的一致性支持对这些新物种的描述，与相关物种相比，这些新物种属于分化良好的进化枝。分子系统发育分析中包括的三个新物种中的任何一个与其他 Diplommatina 物种之间的 K2P 距离在 COI 中至少为 5.5%，在 16S 中为 3.9%。三个新物种中的两个（D. prakaiphetensissp. nov. 和 D. bulonensissp. nov.）显然分别是 Prakaiphet Hill 和 Bulon Pai Island 特有种。此外，我们还记录了沙敦府 D. naiyanetri 的新区域记录。这些新物种和记录有助于了解泰国陆生蜗牛的生物多样性，并突出了对区域喀斯特栖息地进行保护的必要性。我们在沙敦府记录了 D. naiyanetri 的新区域记录。这些新物种和记录有助于了解泰国陆生蜗牛的生物多样性，并突出了对区域喀斯特栖息地进行保护的必要性。我们在沙敦府记录了 D. naiyanetri 的新区域记录。这些新物种和记录有助于了解泰国陆生蜗牛的生物多样性，并突出了对区域喀斯特栖息地进行保护的必要性。