Seven new species of the segmented spider genus Liphistius (Mesothelae, Liphistiidae) in Thailand and Myanmar Author Sivayyapram, Varat https://orcid.org/0000-0002-8466-0270 Center of Excellence in Entomology and Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand Author Kunsete, Chawakorn Center of Excellence in Entomology and Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand Author Xu, Xin https://orcid.org/0000-0001-5632-6622 College of Life Sciences, Hunan Normal University, Changsha, Hunan 410081, China Author Smith, Deborah R. https://orcid.org/0000-0002-2581-5009 Department of Ecology & Evolutionary Biology, Haworth Hall, 1200 Sunnyside Avenue, University of Kansas, Lawrence, KS 66045, USA Author Traiyasut, Prapun Program in Biology, Faculty of Science, Ubon Ratchathani Rajabhat University, Ubon Ratchathani, Thailand Author Deowanish, Sureerat Center of Excellence in Entomology and Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand Author Aung, Mu Mu Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin, Nay Pyi Taw, Myanmar Author Ono, Hirotsugu https://orcid.org/0000-0002-8568-4549 Department of Zoology, National Museum of Nature and Science, Tsukuba, Ibaraki 305 - 0005, Japan Author Li, Daiqin https://orcid.org/0000-0001-8269-7734 School of Life Sciences, Hubei University, Wuhan, Hubei 430062, China Author Warrit, Natapot https://orcid.org/0000-0002-6338-1782 Center of Excellence in Entomology and Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand & Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung 80708, Taiwan ich108@hotmail.com text ZooKeys 2024 2024-01-16 1189 201 229 http://dx.doi.org/10.3897/zookeys.1189.115850 journal article http://dx.doi.org/10.3897/zookeys.1189.115850 1313-2970-1189-201 7C2F288F95EB410ABF6E0C13990B472F 474DBFBFABDA59DD83E861DE6C4CDD94 Liphistius choosaki Sivayyapram & Warrit sp. nov. Figs 1 , 4 Type material. Holotype : Thailand • 1♀; Phrae, Wang Chin District, Mae Koeng; alt. 265 m; 5 October 2019; N. Warrit, V. Sivayyapram, C. Kunsete, N. Chatthanabun, P. Traiyasut leg.; ARA-2019-057. Paratype : Thailand • 1♀; same data as for the holotype; ARA-2019-056. Other materials. Thailand • 3 juveniles ; same data as for the holotype; ARA-2019-059, ARA-2019-061, ARA-2019-062 . Diagnosis. Liphistius choosaki sp. nov. is similar to L. dawei sp. nov., L. inthanon , and L. yamasakii in its uniformly dark coloration. The female of L. choosaki sp. nov. can be distinguished from those of L. dawei , L. inthanon , and L. yamasakii by the characters of vulva: pore plate distinctly wider than long with almost straight anterior margin; and by its larger body size. Description. Male. Unknown. Female (Holotype: ARA-2019-057; Fig. 4A ). Coloration (in alcohol) : carapace uniformly brown; abdominal tergites dark brown; membranous part of the opisthosoma cream color with thin mottled black marking; chelicerae bicolor, orange on proximal part and dark brown on distal part; palp and legs brown, without distinct annulations. Figure 4. Liphistius choosaki sp. nov. female, ARA-2019-057 (holotype) A dorsal view B, C vulva plate B ventral view C dorsal view. Abbreviations: CDO = central dorsal opening; GA = genital atrium; mm = millimeter; PP = poreplate; PS = posterior stalk; RC = receptacular cluster. Scale bars: 10 mm ( A ); 1 mm ( B, C ). Vulva (Fig. 4B, C ): vulva plate hexagonal, genital atrium with folded lateral margins, carrying lateral hairs; posterior stalk very wide, M-shaped posterior margin; pore plate rectangular, wider than long, lateral margin convex, anterior margin almost straight, all margins thickened and projected into a lip; receptacular cluster racemose, longer than wide; central dorsal opening wide longer than wide. Measurements : Total length 36.40; carapace 18.33 long, 16.38 wide; opisthosoma 17.94 long, 15.34 wide; ocular tubercle 1.82 long, 1.95 wide; palpal coxa 5.46 long, 3.25 wide; labium 2.08 long, 4.29 wide; sternum 9.75 long, 3.90 wide (1.95 on ventral surface); palp 29.12 long (10.66 + 5.59 + 7.02 + - + 5.85); leg I 34.71 long (12.48 + 6.50 + 7.15 + 6.24 + 2.34); leg II 36.40 long (11.96 + 5.85 + 7.41 +7.54 +3.64); leg III 40.82 long (12.74 + 6.89 + 7.67 + 9.49 + 4.03); leg IV 53.69 long (15.21 + 7.41 + 10.79 + 14.95 + 5.33). Etymology. The specific epithet choosaki honors the late Mr. Choosak Pungrusmee, father to Mr. Sarawut Pungrusmee and dedicated philanthropist to the study of biodiversity in our research laboratory. Distribution. Known only from the type locality. Comment. This new species name was mentioned as Liphistius sp. WKS in Sivayyapram et al. (2023) .