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 cangshan Tong, Yang & Zhang sp. nov. Figs 1 , 2 , 8 Type material. Holotype ♂ (SYNU-660): China, Yunnan Province, Dali Bai Autonomous Prefecture, Dali City, Cangshan Mountain, post-fire forest in 1999, 25°38′30″N , 100°08′04″E , Z. Yang leg., 2/11/2009. Diagnosis. Males of the new species are similar to those of T. bawan Tong, Zhang & Li, 2019 in the shape of palp, but they can be distinguished by the reduced eyes (Fig. 1D, F ) vs normal, the smooth sternum (Fig. 1E ) vs with grooves at posterior part, and the slightly elevated epigastric region (Fig. 1B, C ) vs epigastric region strongly elevated ( Tong et al. 2019 : fig. 1A, E, G-I). Figure 1. Trilacuna cangshan sp. nov., male holotype A-C habitus in dorsal, ventral, and lateral views D-F prosoma in dorsal, ventral, and anterior views G labium and endites in ventral view H chelicerae, slightly oblique lateral view. Abbreviations: cdb = slightly curved distal branch; ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm ( A-F ); 0.2 mm ( G, H ). Description. Male (holotype). Body : yellow, legs lighter; habitus as in Fig. 1A-C ; body length 1.76. Carapace : 0.78 long, 0.67 wide; sides granulate, lateral margin rebordered (Fig. 1D, F ). Eyes : vestigial, only visible in frontal view (Fig. 1D, F ). Mouthparts : chelicerae straight, proximal region with one seta with elevated base; labium rectangular, anterior margin deeply incised; endites slender, distally branched (Fig. 1E, G, H ). Sternum : surface finely reticulated (Fig. 1E ). Abdomen : 1.01 long, 0.60 wide; booklung covers ovoid, surface smooth; dorsal scutum not fused to epigastric scutum; sperm pore situated at level of anterior spiracles; apodemes present, posterior spiracles connected by groove; epigastric region slightly elevated, with a cluster of densely short setae (Fig. 1A-C ). Palp : orange; 0.64 long (0.20, 0.13, 0.13, 0.18); femur greatly elongated (width/length = 0.64); bulb kidney-shaped, tapering apically; psembolus with basal leaf-shaped projection (blp) and ventral broad lobes (vbl); with dorsal median branch (lmb) and retrolateral, long curved branch (lcb) (Fig. 2 ). Figure 2. Trilacuna cangshan sp. nov., left male palp A-F (light) and right male palp G-L (SEM, images flipped horizontally) 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: blp = basal leaf-shaped projection; bth = basal thin "hairs" ; dth = distal thick "hairs" ; lcb = lateral curved branch; lh = lateral "hairs" ; lmb = long median branch; vbl = ventral broad lobes. Scale bars: 0.2 mm ( A-C, G-I ); 0.02 mm ( D-F, J-L ). 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 ).