Three new species of the genus Trilacuna Tong & Li, 2007 (Araneae, Oonopidae) from Yunnan Province, China Author Ma, Jimeng https://orcid.org/0009-0008-4579-3506 Life Science College, Shenyang Normal University, Shenyang 110034, Liaoning, China Author Bian, Dongju https://orcid.org/0000-0002-9324-8026 Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Author Tong, Yanfeng https://orcid.org/0000-0002-4348-7029 Life Science College, Shenyang Normal University, Shenyang 110034, Liaoning, China tyf68@hotmail.com Author Yang, Zizhong https://orcid.org/0000-0002-2143-8226 National-Local Joint Engineering Research Center of Entomoceutics, Dali University, Yunnan Dali, 671000, China yangzzh69@163.com Author Zhang, Zhisheng https://orcid.org/0000-0002-9304-1789 Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Life Sciences, Southwest University, Chongqing 400715, China zhangzs327@qq.com text ZooKeys 2023 2023-08-14 1174 289 300 http://dx.doi.org/10.3897/zookeys.1174.106130 journal article http://dx.doi.org/10.3897/zookeys.1174.106130 1313-2970-1174-289 FC99CBBB53534F81B6F807A6E8ACCBF3 72D6CE1BE1E0538384A228AE97DE1D46 Trilacuna wumanshan Tong, Yang & Zhang sp. nov. Figs 3 , 4 , 8 Type material. Holotype ♂ (SYNU-661): China, Yunnan Province, Lincang City, Cangyuan Wa Autonomous County, Banhong township, Wuman Hill, 23°15′15″N , 99°05′52″E , Z. Yang leg., 13/5/2021. Diagnosis. The new species is similar to T. longtankou Tong & Li, 2020 in the shape of the male palp, but it can be distinguished by the smooth sternum (Fig. 3B ) vs sternum with two rows of paddle-shaped setae, and the large dorsal prong and the narrow lateral and dorsal branches of psembolus (Fig. 4J, K ) vs a basal branch and several broad branches of psembolus ( Huang et al. 2020 : fig. 3E, F, H). Figure 3. Trilacuna wumanshan sp. nov., male holotype A-C habitus in dorsal, ventral, and lateral views, arrow shows the elevated epigastric region D-F prosoma in dorsal, ventral, and anterior views G labium and endites in ventral view H chelicerae in slightly oblique lateral view. Abbreviations: ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm ( A-F ); 0.2 mm ( G, H ). Figure 4. Trilacuna wumanshan sp. nov., left male palp, A-F (light) and G-L (SEM) A, G prolateral view B, H dorsal view C, I retrolateral view D, J distal part of bulb, prolateral view E, K distal part of bulb, dorsal view F, L distal part of bulb, retrolateral view. Abbreviations: bsh = basal short "hairs" ; db = dorsal branch; lb = lateral branch; ldp = large dorsal prong; mb = median branch; vp = ventral projection. Scale bars: 0.1 mm ( A-C, G-I ); 0.05 mm ( D-F, J-L ). Description. Male (holotype). Body : yellow-brown, chelicerae and sternum lighter, legs yellow; habitus as in Fig. 3A-C ; body length 1.44. Carapace : 0.70 long, 0.56 wide; sides smooth, lateral margin rebordered (Fig. 3D ). Eyes : ALE largest, PME smallest; ALE separated from edge of carapace by 1.0 diameters (Fig. 3D, F ). Mouthparts : chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised; endites slender, distally not branched (Fig. 3E, G, H ). Sternum : surface finely smooth (Fig. 3E ). Abdomen : 0.72 long, 0.47 wide; booklung covers ovoid, surface smooth; dorsal scutum not fused to epigastric scutum; sperm pore situated at level of posterior spiracles; apodemes present, posterior spiracles not connected by groove; epigastric region slightly elevated (Fig. 3A-C ). Palp : orange; 0.54 long (0.16, 0.09, 0.12, 0.17); femur greatly elongated (width/length = 0.60); bulb triangle, tapering anteriorly; psembolus with large dorsal prong (ldp), a cluster of basal short "hairs" (bsh), and a small ventral projection (vp); with a broad median branch (mb), a narrow lateral branch (lb) and a dorsal branch (db) (Fig. 4 ). Female. Unknown. Etymology. The specific name is a noun in apposition taken from the type locality. Distribution. Known only from the type locality, Yunnan Province, China (Fig. 8 ).