Twenty-eight new species of the spider genus Merizocera Fage, 1912 (Araneae, Psilodercidae) from South and Southeast Asia Author Chang, Wan-Jin Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China & Southeast Asia Biological Diversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar & University of Chinese Academy of Sciences, Beijing 100049, China Author Yao, Zhiyuan Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China https://orcid.org/0000-0002-1631-0949 Author Li, Shuqiang Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China & University of Chinese Academy of Sciences, Beijing 100049, China https://orcid.org/0000-0002-3290-5416 lisq@ioz.ac.cn text ZooKeys 2020 961 41 118 http://dx.doi.org/10.3897/zookeys.961.53058 journal article http://dx.doi.org/10.3897/zookeys.961.53058 1313-2970-961-41 B5627BFE56A242B3B3A596BAE07724F4 C1D92F70C65F53668E36B8CF62DB4D8A Merizocera wui Li sp. nov. Figures 47 , 48 , 53 Type material. Holotype : male (IZCAS), Roadside between Wasadum and Ziradum ( 27°32.31'N , 97°7.54'E , elevation 978 m), Putao, Kachin State , Myanmar , 12 December 2016, J. Wu leg. Paratypes : 1 male and 2 females (IZCAS), same data as holotype. Etymology. The specific name is a patronym in honour of the collector Jianglang Wu; noun (name) in genitive case. Diagnosis. Diagnosis features of males and females are discussed in M. wenshan sp. nov. Males with a spherical bulb, thin narrow embolus (Fig. 47B ), and a narrow cymbial protrusion (Fig. 47D ). Females with angled clavate spermathecae (Fig. 48A ). Figure 47. Merizocera wui sp. nov., holotype ( A, C, D ) and paratype ( B ) male. A Bulb, dorsal view B bulb, prolateral view C palp, prolateral view D palp, retrolateral view. Abbreviations: CO = conductor, CP = cymbial protrusion, EM = embolus. Description. Male (holotype). Total length 1.53; carapace 0.67 long, 0.57 wide; abdomen 0.84 long, 0.79 wide. Carapace circular, brownish, with dark brown radiating marks (Fig. 48C ). Fovea shallow. Thoracic region distinctly elevated medially. Clypeus, labium and Sternum dark brown. Abdomen ovoid, dark brown but dark grey dorso-medially. Legs light brown; measurements: I missing, II 4.34 (1.18, 0.22, 1.27, 1.10, 0.57), III 3.37 (0.88, 0.20, 0.95, 0.86, 0.48), IV 4.79 (1.19, 0.23, 1.45, 1.21, 0.71). Palp (Fig. 47A-D ): femur slender, five times longer than patella; patella not swollen; tibia not swollen, half as long as femur; cymbium with distal protrusion, length ratio of dorsal elongation and cymbium 0.92; bulb spherical, with embolus and conductor arising distally; embolus slender and upright, twice longer than tegular; conductor needle-like, adjacent and basally connected to embolus. Figure 48. Merizocera wui sp. nov., holotype male and paratype female. 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. Female (paratype). Similar to male in colouration and general features but slightly larger (Fig. 48D, E ). Measurements: total length 1.42; carapace 0.70 long, 0.58 wide; abdomen 0.75 long, 0.60 wide. Leg measurements: I 4.11 (1.06, 0.21, 1.25, 0.99, 0.60), II missing, III 3.40 (0.89, 0.21, 0.97, 0.82, 0.51), IV 4.16 (1.06, 0.22, 1.24, 0.99, 0.65). Epigastric area (Fig. 48B ): dark brown oval patch, medially with a pale brown slit. Endogyne (Fig. 48A ) with a pair of clavate spermathecae, slightly angled toward each other, ratio of the width of a spermatheca to the interdistance of spermathecae 1:5. Distribution. Known only from the type locality (Myanmar; Fig. 53 ).