We diagnose and describe three new species of the primitively segmented spider genus Liphistius from Thailand, based on male palp and female genital morphology: L.hatyai Zhan & Xu, sp. nov. (♂♀), L.keeratikiati Zhan & Xu, sp. nov. (♂♀), and L.inthanon Zhan & Xu, sp. nov. (♂♀). The classification of the three new species of Liphistius is discussed: L.hatyai sp. nov. and L.keeratikiati sp. nov. are assigned to the trang -group, and L.inthanon sp. nov. is placed in the bristowei -group according to male palp and female genital morphology.
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