Taxonomic study on Mysmenidae spiders (Mysmenidae, Araneae) from Xishuangbanna of Yunnan, China Author Zhang, Qiuqiu Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China Author Li, Shuqiang https://orcid.org/0000-0002-3290-5416 The Sichuan Key Laboratory for Conservation Biology of Endangered Wildlife, Sichuan University, Chengdu, Sichuan 610064, China lisq@ioz.ac.cn Author Lin, Yucheng https://orcid.org/0000-0002-5054-0633 Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China linyucheng@scu.edu.cn text ZooKeys 2022 2022-10-10 1124 59 108 http://dx.doi.org/10.3897/zookeys.1124.85952 journal article http://dx.doi.org/10.3897/zookeys.1124.85952 1313-2970-1124-59 09D04DEB58C24007AA8656ACABDE7BE3 2EFCF735419B588081D1586C3D1A8827 Mengmena yulin Lin & Li sp. nov. Fig. 6 Material examined. Holotype ♀ (IZCAS) and paratypes 4♀ (IZCAS), China : Yunnan , Mengla County , Menglun Town , XTBG, the secondary tropical rainforest ( 22.036°N , 101.389°E ; 598 +/- 17 m ), 9-13.VIII.2006 , by pitfall trapping, G. Zheng leg.; 31♀ (NHMSU), same data as holotype, 1-15.VII.2007 , by searching, G. Zheng leg. Etymology. The specific name derives from the Chinese pinyin for rainforest (yǔ lin ), refers to it living in rainforest habitats. The epithet is a noun in apposition. Diagnosis. The new species is similar to Mengmena banna sp. nov. but can be distinguished by having a straight and smooth posterior brim formed by the fusion of the copulatory ducts, and the copulatory opening situated above this brim (Fig. 6E, F vs. Fig. 3H, I ). Description. Female. Measurement : total length 0.78. Prosoma 0.32 long, 0.29 wide, 0.28 high. Abdomen 0.49 long, 0.48 wide, 0.53 high. Clypeus 0.05 high. Sternum 0.21 long, 0.20 wide. Length of legs [total length (femur, patella, tibia, metatarsus, tarsus)]: I 0.92 (0.30, 0.11 0.19, 0.15, 0.17); II 0.85 (0.28, 0.10, 0.17, 0.13, 0.17); III 0.66 (0.19, 0.09, 0.12, 0.11, 0.15); IV 0.79 (0.25, 0.10, 0.16, 0.12, 0.16). Somatic characters (Fig. 6A-C ). Coloration : prosoma light-yellow centrally, deep yellow marginally. Ocular base black. Chelicera yellow. Endites, labium and sternum light-yellow. Abdomen grey dorsally, pale yellow ventrally, brown marginally. Legs yellow. Prosoma : carapace pear-shaped. Cephalic part slightly elevated. AME absent, six eyes in two rows, white, with black rings. ALE and PLE contiguous. Sternum scutiform, plump, covered with sparse setae. Legs : covered with setae and bristles, a sclerotized femoral spot present at apical ventral surface of leg I and II. Abdomen : round in dorsum. Epigyne (Fig. 6D-F ): spermathecae small, ovate, widely separated by at least four times their width (Figs 6E, F ). Fertilization ducts short, derived from inner side of the spermathecae and bent anteriorly to form an arc (Fig. 6F ). Copulatory ducts arising from ventral of spermathecae, both sides of copulatory duct fused at the midline position and forming two symmetrical peak shapes (the anterior brim of the fused copulatory ducts broad arc shape, the posterior brim of the fused copulatory ducts near straight) (Fig. 6E, F ). Copulatory opening inconspicuous, situated above the straight brim (Fig. 6E, F ). Male. Unknown. Distribution. Known only from the type locality.