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 xiaoheishan Tong, Yang & Zhang sp. nov. Figs 5 , 6 , 7 , 8 Type material. Holotype ♂ (SYNU-653): China, Yunnan Province, Baoshan City, Longling County, Xiaoheishan Natural Reserve, Z. Li & L. Wang leg., 17/2/2011; Paratypes 1 ♂ (SYNU-654),1 ♀ (SYNU-655), 2 ♀ (SYNU-656-657), same data as holotype. Diagnosis. Males of the new species are similar to those of T. werni Eichenberger, 2011 in the shape of the male palp, but they can be distinguished by the branch of psembolus with row of combs (Fig. 6D, J ) vs a groove with row of lobes ( Eichenberger and Kranz-Baltensperger 2011 : fig. 12A, B, E, I), and the unfused abdominal dorsal and ventral scuta (Fig. 5C ) vs dorsal scutum fused to the epigastric scutum ( Eichenberger and Kranz-Baltensperger 2011 : fig. 11C). Females can be distinguished from the other Trilacuna species by the curved posterior margin of epigastric scutum (Fig. 7F, G ) vs roundly bent. Figure 5. Trilacuna xiaoheishan 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, anterior view. Abbreviations: ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm ( A-F ); 0.2 mm ( G, H ). Figure 6. Trilacuna xiaoheishan 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: brc = branch with row of combs; sdb = short dorsal branch; lcb = lateral curved branch; tmb = thin median branch; wfb = distally widened flat branch. Scale bars: 0.1 mm ( A-C, G-I ); 0.05 mm ( D-F, J-L ). Figure 7. Trilacuna xiaoheishan sp. nov., female paratype A-C habitus in dorsal, ventral, and lateral views D, E prosoma in dorsal and ventral views F abdomen in ventral view G, H copulatory organ in ventral and dorsal views, arrow shows the curved posterior margin. Abbreviations: ap = apodemes; as = anterior sclerite; glo = globular structure; psp = posterior spiracle; sar = sclerotized, recurved arches; tsc = transverse sclerite. Scale bars: 0.4 mm ( A-F ); 0.2 mm ( G, H ). Description. Male (holotype). Body : reddish-brown, chelicerae and sternum lighter, legs yellow; habitus as in Fig. 5A-C ; body length 2.37. Carapace : 1.08 long, 0.89 wide; sides smooth, lateral margin rebordered (Fig. 5D ). Eyes : ALE largest, PME smallest; ALE separated from edge of carapace by 0.93 diameters (Fig. 5D, 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. 5E, G, H ). Sternum : surface strongly rugose (Fig. 5E ). Abdomen : 1.36 long, 0.92 wide; booklung covers ovoid, surface smooth; apodemes present; sperm pore situated at level of anterior spiracles; posterior spiracles connected by groove (Fig. 5A-C ). Palp : orange; 0.79 long (0.24, 0.15, 0.17, 0.23); femur greatly elongated (width/length = 0.61); bulb triangle, tapering anteriorly; psembolus with a long distally widened flat branch (wfb), with a row of combs (brc) at basal half of the branch and numerous "hairs" on distal half of the branch; with a retrolateraly long curved branch (lcb), a short dorsal branch (sdb) and a thin median branch (tmb) (Fig. 6 ). Female (paratype, SYNU-655). Body : habitus as in Fig. 7A-C ; slightly larger than male; body length 2.57. Carapace : 1.09 long, 0.91 wide. Mouthparts : endites unmodified. Abdomen : 1.60 long, 1.13 wide. Epigastric area : middle part of posterior margin of epigastric scutum curved, with sclerotized recurved arches (sar) between posterior spiracles (psp) (Fig. 7F, G ). Endogyne : with narrow, transversally elongated sclerite (tsc); anterior T-shaped sclerite (as) and posterior small globular structure (glo) (Fig. 7G, H ). 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 ). Figure 8. Distribution records of three new species from Yunnan, China. 1. Trilacuna cangshan sp. nov.; 2. Trilacuna wumanshan sp. nov.; 3. Trilacuna xiaoheishan sp. nov.