Material examined. Holotype ♂ (IZCAS), Indonesia, Sumatra, West Sumatra Province, Payakumbuh, near exit of Ngalau Indah Cave (0º15.296′S, 100º36.256′E), elev. 626 m, 14.V.2014, leg. Z. Yao. Paratypes 2♂ 3♀ (IZCAS), same data as holotype.
Etymology. The specific name is derived from the type locality; noun.
Diagnosis. The new species is similar to S. xuanson Li & Li sp. nov., but males can be distinguished by the unmodified chelicerae (Fig. 57A) and the very long, curved associated sclerites of the male embolus (Figs 38A–B), and females by the small spermathecae (Fig. 39A). S. xuanson males have the chelicerae laterally strongly excavated, with a horn-like apophysis (Figs 57I–J), and long, straight associated sclerites of the embolus (Figs 51A–B), and the females have relatively larger spermathecae (Fig. 52A).
Description. Male. Total length 0.79; carapace length 0.40; carapace width 0.34; abdomen length 0.38; abdomen width 0.30. Prosoma: carapace broadly oval, narrowing gradually anteriorly; shiny, light yellow, suffused with purplish pattern (Fig. 39C); pars cephalica flat; fovea not visible. Sternum brown, as long as wide. Endites light yellow, suffused with purplish tinge; with serrula; labium light yellow suffused with purplish tinge. Clypeus nearly vertical; short. Chelicerae light yellow; promargin with a series of six teeth reaching the lamina; retromargin with two very small denticles (Fig. 57A). Eyes: six contiguous eyes surrounded by black pigmentation; PME, ALE and PLE nearly subequal (Fig. 39C). Opisthosoma oval; purplish. Legs light yellow; leg lengths I, II, III missing; IV 1.65 (0.45, 0.14, 0.45, 0.37, 0.24). Genitalia (Fig. 38). Palpal femur long; palpal tibia twice as long as cymbium. Cymbium conical, with a large prolateral extension basally. Bulb spherical. Embolus triangular, dark and basally with one long, curved associated sclerite; sperm duct initially wide narrowing distally (Fig. 38D).
Female. Total length 0.99; carapace length 0.42; carapace width 0.37; abdomen length 0.56; abdomen width 0.42. Similar to male in color and general features (Figs 39D–E) but larger. Leg lengths I 1.51 (0.40, 0.14, 0.44, 0.30, 0.23); II missing; III 1.23 (0.32. 0.13, 0.31, 0.28, 0.20); IV 1.61 (0.45, 0.13, 0.44, 0.35, 0.25). Genitalia. Internal genitalia with afferent spermathecae long, extending past the sides of the abdomen (Fig. 39B); spermathecae oval (Fig. 39A).
Distribution. Known only from the type locality.