Thaiderces jiazi Li & Chang sp. nov. Figs 2G, 15, 27I, 29

Types.

Holotype: ♀ (IZCAS), Thailand, Satun Province, Khuang Kalong District, Khao Wang Cave, 06°56.3167'N, 100°1.3083'E, 127 m, 17.X.2015, Zhao Q., Zhou G., Chen Z.

Etymology.

The species name is a noun in apposition derived from the Chinese pinyin jiázǐ (clamp) and refers to the spermathecae structure which resembles a face clamp (Fig. 15A).

Diagnosis.

Thaiderces jiazi sp. nov. can be distinguished from other species by the unique pattern on the carapace, with trident purplish stripes medially and purplish stripes laterally (Fig. 15C), a pair of spermathecae that resemble a face clamp (curved perpendicularly and oppositely directed), attached to a funnel-shaped structure posteriorly (Fig. 15A) (vs. stalked spermathecae with oblong heads connected by a horizontal arched duct in T. zuichun sp. nov.).

Description.

Female. Total length 1.47; carapace 0.54 long, 0.62 wide; abdomen 0.93 long, 0.65 wide. Carapace round and pale yellow, with trident purplish stripes medially and purplish stripes laterally. Chelicerae brown (Fig. 27I). Clypeus brown medially. Endites purple. Labium yellow. Sternum with purplish pattern. Abdomen elongated, pale yellow, almost plain without distinct pattern (Fig. 15C), ventrum with purplish and yellowish indistinct pattern, with medial epigastric area semi-circular (Fig. 15D). Legs uniformly brown; measurements: I missing, II 5.27 (1.40, 0.25, 1.50, 1.37, 0.75), III 4.23 (1.12, 0.20, 1.20, 1.09, 0.62), IV 4.12 (1.09, 0.20, 1.20, 1.09, 0.54). Endogyne: a pair of stalked spermathecae curved perpendicularly and oppositely directed, stalk length is eight times the width of the spermathecae, spermathecae connected by stalks to funnel-shaped base, ratio of the width of funnel to the width of a stalked spermatheca 1: 10 (Fig. 15A).

Male. Unknown.

Distribution.

Known only from the type locality (Fig. 29).