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 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 ). Figure 9. Thaiderces ngalauindahensis sp. nov., male holotype A habitus, dorsal view B habitus, ventral view. Female. Unknown. Distribution. Known only from the type locality ( Fig. 29 ). Figure 10. Thaiderces ngalauindahensis sp. nov., male holotype A palp, ventral view B palpal bulb, ventral view C palp, prolateral view D palp, retrolateral view. Abbreviations: EM, embolus, LA, lamina apophysis.