Liphistius choosaki Sivayyapram & Warrit, 2024

Sivayyapram, Varat, Kunsete, Chawakorn, Xu, Xin, Smith, Deborah R., Traiyasut, Prapun, Deowanish, Sureerat, Aung, Mu Mu, Ono, Hirotsugu, Li, Daiqin & Warrit, Natapot, 2024, Seven new species of the segmented spider genus Liphistius (Mesothelae, Liphistiidae) in Thailand and Myanmar, ZooKeys 1189, pp. 201-229 : 201

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.

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).

Figures

Figure 1. Map showing the localities of the new Liphistius species described.

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).