Thaiderces ngalauindahensis Li & Chang sp. nov. Figs 1B, 9, 10, 27F, 29

Types.

Holotype: ♂ (IZCAS), Indonesia, Sumatra, West Sumatra Province, Pavakumbuh, Ngalau Indah Cave, 00°15.296'S, 100°36.256'E, 626 m, 14.V.2014, Yao Z.

Etymology.

The species name is an adjective referring to the type locality.

Diagnosis.

Thaiderces ngalauindahensis sp. nov. is similar to T. rimbu, but males can be distinguished by lamina connected to the embolus (Fig. 10D) (vs. the absence of lamina connected to the embolus in T. rimbu) and the embolic stalk is slanted at a 30° incline (Fig. 10D) (vs. embolic stalk rather round and curved in T. rimbu).

Description.

Male (holotype). Total length 1.16; carapace 0.54 long, 0.55 wide; abdomen 0.62 long, 0.31 wide. Carapace round and brown, with three longitudinal dark brown bands, median band with distinct patch centrally, lateral bands four times wider than the middle band (Fig. 9A). Chelicerae brown (Fig. 27F). Clypeus dark brown medially and light brown laterally. Endites light brown. Labium dark brown. Sternum with dark brown pattern. Abdomen elongated, dorsum with dark brown complicated veined pattern (Fig. 9A), ventrum dark brown with indistinct pattern (Fig. 9B). Legs uniformly brown; measurements: I missing, II 3.35 (0.90, 0.20, 0.93, 0.78, 0.54), III missing, IV missing. Palp (Fig. 10 C–D): femur four times longer than patella; patella not swollen, tibia almost equal in length to femur; cymbium with concentrated purplish spots, 1/2 the length of femur; bulb light brown, with 30° inclined embolic stalk, embolic stalk half the width of the bulb, lamina attached to embolus; embolus short and dark, arising distally (Fig. 10).

Female. Unknown.

Distribution.

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