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 shuzi Li & Chang sp. nov. Figs 1J , 2M , 3 , 4 , 27C , 29 Types. Holotype : ♂ (IZCAS), Thailand, Prachuap Kiri Khan Province, Hua Hin District, Nong Phiap Subdistrict, Dao Cave, 12°35.449'N , 99°43.692'E , 123 m, 30.X.2014, Zhao H., Li Y., and Chen Z. Paratype : 1♀ (IZCAS), same data as holotype. Etymology. The species name is a noun in apposition derived from the Chinese pinyin shūz ǐ (comb) and refers to the serrated stubble on the embolic stalk that resembles a comb. Diagnosis. Males of T. shuzi sp. nov. can be distinguished from all other species of the genus by the unique structure of the male bulb with a long embolic stalk bearing serrated embolic stubble ( Fig. 4A ) that resembles a comb (vs. absence of serrated embolic stubble in congeners); females can be differentiated from congeners by two pairs of stalked spermathecae with globose distal parts ( Fig. 3A ) (vs. one pair of spermathecae or spermathecae without stalk in congeners). Figure 3. Thaiderces shuzi sp. nov., male holotype and female paratype A endogyne, dorsal view B female epigastric area, ventral view C male habitus, dorsal view D female habitus, dorsal view E female habitus, ventral view. Abbreviation: SP, spermatheca. Description. Male (holotype). Total length 1.78; carapace 0.78 long, 0.70 wide; abdomen 1.00 long, 0.70 wide. Carapace round and pale yellow ( Fig. 3C ). Chelicerae brown ( Fig. 27C ). Clypeus pale yellow. Endites pale yellow. Labium light brown. Sternum with purplish pattern. Abdomen elongated, dorsum with 3 distinct brown spots medially ( Fig. 3C ), anteroventrally with a pair of circular purplish patches, posterior part with a pattern ranging from light purple to dark purple. Legs uniformly brown; measurements: I 5.29 (1.40, 0.20, 1.56, 1.25, 0.88), II 7.36 (2.00, 0.20, 2.19, 1.88, 1.09), III 5.27 (1.56, 0.31, 1.40, 1.30, 0.70), IV 7.25 (2.00, 0.25, 2.20, 1.80, 1.00). Palp ( Fig. 4 A-D ): femur slender, 5 times longer than patella; patella not swollen, tibia almost equal in length to femur, basally swollen (length/width = 2.30); cymbium pale, three times shorter than femur; bulb light yellow, spatulate, with a long embolic stalk bearing serrated stubble, embolic stalk almost equal in length to the bulb, 2/3 the width of the bulb; embolus straight and short apically ( Fig. 4B ). Figure 4. Thaiderces shuzi sp. nov., male holotype A palp, ventral view B palpal bulb, ventral view C palp, prolateral view D palp, retrolateral view. Abbreviations: EM, embolus, ST, stubble. Female (Paratype). General features and coloration similar to that of male ( Fig. 3 D-E ). Measurements: total length 2.00; carapace 0.70 long, 0.70 wide; abdomen 1.30 long, 1.00 wide. Leg measurements: I‒II missing, III 4.54 (1.28, 0.25, 1.25, 1.13, 0.63), IV 4.51 (1.25, 0.25, 1.25, 1.13, 0.63). Endogyne: two pairs of stalked spermathecae bearing globose distal parts, lateral spermathecae directed horizontally, medial spermathecae pointed vertically, width of globose part ca. 3 times wider than stalk. ( Fig. 3A ). Distribution. Known only from the type locality ( Fig. 29 ).