Fourteen new species of the spider genus Thaiderces from Southeast Asia (Araneae, Psilodercidae) Author Chang, Wan-Jin Author Li, Shuqiang text ZooKeys 2019 869 103 146 http://dx.doi.org/10.3897/zookeys.869.35546 journal article http://dx.doi.org/10.3897/zookeys.869.35546 1313-2970-869-103 AFF62E384FD44E5D9D923EC97E4A4368 C2F78CD4117E5B31B633483BA4168206 Thaiderces chujiao Li & Chang sp. nov. Figs 22 , 28A , 29 Types. Holotype : ♀ (IZCAS), Thailand, Chiangmai Province, Mae Cham District, Jeep track, 18°31.677'N , 98°29.963'E , 1649 m, 14.X.2014, Zhao H., Li Y., Chen Z. Etymology. The species name is a noun in apposition derived from the Chinese pinyin chujiăo (antenna) and refers to the structure of the spermathecae that resembles two pairs of clavate antennae ( Fig. 22A ). Diagnosis. Thaiderces chujiao sp. nov. can be distinguished from other species by the two pairs of tubular spermathecae resembling two pairs of clavate antennae, lateral pair half the length of the median pair ( Fig. 22A ) (vs. circular spermathecae with with ovoid duct in T. haima sp. nov.). Description. Female (holotype). Total length 1.62; carapace 0.60 long, 0.70 wide; abdomen 1.02 long, 0.60 wide. Carapace round and brown, with three longitudinal dark brown bands, lateral bands three times wider than the median band. Chelicerae brown ( Fig. 28A ). Clypeus dark brown medially and light brown laterally. Endites brown. Labium dark brown. Sternum with dark brown pattern. Abdomen elongated, with dark brown pattern ( Fig. 22C ), anteroventrally with semi-circular light brown epigastric area medially, posterior part with pair of light brown vertical dotted lines laterally and a V-shaped mark medially ( Fig. 22D ). Legs uniformly brown; measurements: I 4.84 (1.25, 0.31, 1.41, 1.09, 0.78), II 3.87 (1.00. 0.20, 1.10. 0.94, 0.63), III 3.31 (0.88, 0.25, 0.88, 0.80, 0.50), IV 4.46 (1.09, 0.25, 1.25, 1.12, 0.75). Endogyne: two pairs of tubular spermathecae, lateral pair half the length of the median pair, median pair curved and opposing one another, half the width of lateral pair ( Fig. 22A ). Figure 22. Thaiderces chujiao sp. nov., female paratype A endogyne, dorsal view B epigastric area, ventral view C habitus, dorsal view D habitus, ventral view. Abbreviation: SP, spermatheca. Male . Unknown. Distribution. Known only from the type locality ( Fig. 29 ).