Shaanxinus kuankuoshui Irfan, Rehman, Wang & Zhang, 2026, sp. nov.

Shaanxinus kuankuoshui sp. nov. Figs 4 A – D, 10 F, 10 G, 11 Chinese name. 宽阔水陕蛛. Type material. Holotype: • ♂, China: Guizhou Province, Kuankuoshui Reservoir, Kuankuoshui Nature Reserve Central Management Station, 28°12.473'N, 107°10.378'E, alt. 1435 m, 2010-06-04, Li Zongxu, Wang Luyu leg. (SWUC -T-LIN-41-01). Etymology. The specific epithet is derived from the type locality. Diagnosis. Male of Shaanxinus kuankuoshui sp. nov. resembles S. longiembolus Irfan, Zhang & Peng, 2025 in having a similar paracymbium and anterior radical apophysis (Fig. 4 B; Irfan et al. 2025: fig. 218), but it can be distinguished by the lateral extension of radix tip being arc-shaped in retrolateral view (Fig. 4 B), vs thumb-shaped in S. longiembolus (Irfan et al. 2025: fig. 218 B). Description. Male (holotype, Fig. 10 F, G): total length: 3.09. Carapace 1.49 long, 1.08 wide, yellowish brown, cephalic lobe 0.60 high with many microsetae; sulci present below the anterior eye row; fovea, cervical and radial grooves distinct. Clypeus 0.37 high. Chelicerae with 5 promarginal and 4 retromarginal teeth. AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.05, ALE 0.08, PME 0.08, PLE 0.08, AME – AME 0.03, PME – PME 0.10, AME – PME 0.07, AME – ALE 0.07, PME – PLE 0.06, ALE – ALE 0.37, PLE – PLE 0.41, ALE – PLE 0.01. Length of legs: I 4.99 (1.49, 1.72, 1.15, 0.63), II 5.15 (1.52, 1.68, 1.31, 0.64), III 3.37 (1.11, 1.10, 0.78, 0.38), IV 4.33 (1.25, 1.31, 1.16, 0.61). Leg II longer than I. TmI 0.26. Tibial spine formula: 2-2 - 2 - 2. Abdomen 1.49 long, 1.10 wide, oval, grey dorsally with 6 transverse chevrons, ventral side black. Pedipalp (holotype, Fig. 4 A – D). Patella slightly shorter than tibia, ventrally grooved. Tibia with 2 retrolateral and 1 dorsal trichobothria, posterior margin with long, thick spines. Paracymbium C-shaped, distal arm margin wavy in retrolateral view. Tegulum extending retrolaterally, possessing a small membranous protegulum. Distal suprategular apophysis disc-shaped, with bifurcated end. Radix with anterior radical process small, strongly sclerotised with pointed end; lateral extension of radix slightly curved, apical end robust arc-shaped projection in retrolateral view; tailpiece small, triangular, with pointed end; median membrane present; embolus sclerotised, semicircular, terminal part ends in the apex of lateral extension of radix. Female. Unknown. Distribution. Known only from the type locality (Fig. 11).