Thaiderces haima Li & Chang sp. nov. Figs 1L, 2I, 20, 21, 28C, 29

Types.

Holotype: ♂ (IZCAS), Thailand, Tak Province, Uaphang District, Umphang Subdistrict, Huai Lao Poo Cave, 15°57.680'N, 98°52.510'E, 534 m, 16.XI.2016, Zhao H., Li Y., Chen Z. Paratype: 1♀ (IZCAS), same data as holotype.

Etymology.

The species name is a noun in apposition derived from the Chinese pinyin hăIimă (seahorse) and refers to the distal bending of bulb that resembles the head of a seahorse.

Diagnosis.

See diagnosis of T. fengniao sp. nov.

Description.

Male (holotype). Total length 1.80; carapace 0.60 long, 0.70 wide; abdomen 1.20 long, 0.90 wide. Carapace round and brown, with three longitudinal dark brown bands, lateral bands two times wider than the median band (Fig. 20C). Chelicerae brown (Fig. 28C). Clypeus dark brown medially and light brown laterally. Endites light brown. Labium dark brown. Sternum with dark brown pattern. Abdomen elongated, dorsum with indistinct brown pattern, posterior with brown stripes, anteroventrally with dark brown semi-circle, posterior part with pair of pale yellow vertical dotted lines laterally and a funnel-shaped mark medially. Legs uniformly brown; measurements: I missing, II missing, III 4.78 (1.28, 0.25, 1.38, 1.25, 0.62), IV 7.12 (1.75, 0.31, 2.12, 2.00, 0.94). Palp (Fig. 21 A–D): femur 3 times longer than patella; patella not swollen, tibia almost equal in length to femur; cymbium scattered with purplish spots anteriorly, 1/4 the length of femur; bulb brown, lanceolate with bent distal part, presence of embolic stubble on embolic stalk, embolic stalk 1/3 the width of the bulb, embolus short, arises distally, resembles the head of a seahorse (Fig. 21A).

Female (paratype). General features and coloration similar to that of the male (Fig. 20D, E). Measurements: total length 1.60; carapace 0.50 long, 0.63 wide; abdomen 1.10 long, 0.70 wide. Leg measurements: I missing, II 4.29 (1.09, 0.16, 1.25, 1.09, 0.70), III 4.92 (1.25, 0.16, 1.41, 1.30, 0.80), IV missing. Endogyne: two pairs of circular spermathecae, lateral spermathecae embedded with ovoid duct (Fig. 20A).

Distribution.

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