Ten new species of the spider genus Sinoderces Li & Li, 2017 from China, Laos and Thailand (Araneae, Psilodercidae) Author Bai, Zilong Author Li, Fengyuan Author Li, Shuqiang text ZooKeys 2019 886 79 111 http://dx.doi.org/10.3897/zookeys.886.39212 journal article http://dx.doi.org/10.3897/zookeys.886.39212 1313-2970-886-79 FF4F3062D2834B5D80C3AEFC6361CE39 FE26EDCBAAAE55D9AF310A7BFBD1FD85 Sinoderces khanensis Li & Li sp. nov. Figs 1 , 2 , 21 , 22 Types. Holotype : ♂, Khan Cave, 5.35 km west of Viengkieo Village, Vang Vieng District, Vientiane Province, Laos, 18°55.592'N , 102°23.718'E , 270 m, 01.XI.2012, Yao Z. leg. Paratypes : 1♂2♀, same data as holotype. Etymology. The specific name refers to the cave where type material was collected; adjective. Diagnosis. Male Sinoderces khanensis sp. nov. can be recognized by the overall slender configuration of the palp, with two spines on the cymbium ( Fig. 1B ). The male clypeus has two apophyses ( Fig. 2E ). In the female, the spermathecae are extraordinarily elongated and shaped like the front of headband worn by the Chinese mythological Monkey King, Sun Wukong-two blunt ends that meet and curl upward ( Fig. 2A ). Description. Male (holotype). Total length 2.33; carapace 1.02 long, 0.75 wide; abdomen 1.28 long, 0.70 wide. Clypeus light brown, with two apophyses. Carapace round, light yellow, with brown lateral margins and a wide median brown band, which is noticeably broader in the mid-section ( Fig. 2E ). Cheliceral promargin with one tooth, connected to a lamina, retromargin with a small tooth ( Fig. 21A ). Labium light brown. Sternum brown. Legs brownish yellow, with dark brown joints. Leg measurements: I missing, II 7.82 (2.20, 0.20, 2.33, 2.17, 0.92), III 5.54 (1.60, 0.20, 1.80, 1.52, 0.42), IV 8.52 (2.56, 0.20, 2.64, 2.28, 0.84). Abdomen elongated, with small black stripes, the color tone darkens progressively from front to back ( Fig. 2E ). Spinnerets black. Figure 1. Sinoderces khanensis Li & Li, sp. nov., male holotype A left palp, ventral view B left palp, prolateral view C left palp, retrolateral view D right palpal bulb, prolateral view. Abbreviation: EM embolus. Male palp ( Fig. 1 A-D ): The overall color is pale yellow. Bulb light yellow, conical. Needle-like embolus arising distally from bulb, straight; no conductor. Tibia with numerous long setae and two conspicuous spines. Long femur with sparse hairs. Female (one of the paratypes). Size and color similar to male ( Fig. 2C, D ). Total length 1.92; carapace 0.63 long, 0.72 wide; abdomen 1.29 long, 0.76 wide. Clypeus dark brown. Carapace round, darker than that of the male. Labium and sternum dark brown, a white spot in the middle of sternum. Legs brownish yellow, with darkish brown joints. Leg measurements: I missing, II 6.06 (1.56, 0.19, 1.94, 1.56, 0.81), III 4.71 (1.25, 0.19, 1.38, 1.20, 0.69), IV 7.14 (2.03, 0.20, 2.19, 1.84, 0.88). Abdomen elongated, dorsum color tone darkens progressively towards the posterior end; and ventrum with numerous white spots and other markings. Spinnerets dark brown. Epigyne ( Fig. 2A, B ): Shaped like a mouth with a thick lip ( Fig. 2B ). It has two pairs of spermathecae: a pair of small and spherical spermathecae connected to a pair of highly elongated and looped spermathecae. The spermathecae conjure an image of the headband worn by the Chinese mythological Monkey King with two blunt ends that meet and curl upward ( Fig. 2A ). Distribution. Known only from the type locality ( Fig. 22 ). Natural history. Collected at a cave's entrance at an elevation of 270 m. Figure 2. Sinoderces khanensis Li & Li, sp. nov., male holotype and female paratype A internal genitalia, dorsal view B female epigastric furrow, ventral view C female habitus, dorsal view D female habitus, ventral view E male habitus, dorsal view. Abbreviation: SP spermathecae.