Two new species of the genus Trilacuna from Chongqing Municipality, China (Araneae, Oonopidae) Author Wang, Ying 0000-0002-4824-6451 Life Science College, Shenyang Normal University, Shenyang 110034, Liaoning, China & 854874778 @ qq. com; https: // orcid. org / 0000 - 0002 - 4824 - 6451 854874778@qq.com Author Tong, Yanfeng 0000-0002-4348-7029 Life Science College, Shenyang Normal University, Shenyang 110034, Liaoning, China & tyf 68 @ hotmail. com; https: // orcid. org / 0000 - 0002 - 4348 - 7029 tyf68@hotmail.com Author Bian, Dongju 0000-0002-9324-8026 CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang 110016, China biandongju @ 163. com; https: // orcid. org / 0000 - 0002 - 9324 - 8026 Author Li, Shuqiang Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China text Zootaxa 2021 2021-02-15 4927 3 431 443 journal article 8086 10.11646/zootaxa.4927.3.6 d01e415e-f8de-47ff-96f3-b9540c2f3504 1175-5326 4542368 965C6E25-2552-4BC8-B01D-4B0F006DEEBE Trilacuna difeng Tong & Li , sp. nov. Figs 1 , 2 A–D, 3, 4, 5A–B, 9 Type material. Holotype : Male (SYNU-264), Difeng National Park ( 26º10'45.93''N , 105º28'44.886''E , elevation 1438 m ), Fengjie County , Chongqing Municipality , China , 23 October 2014 , S. Lyu and Y. Tong leg. Paratypes : 2 males (SYNU-265–266) and 3 females (SYNU-267–269), same data as holotype . Other materials examined: 1 male (SYNU-270) and 3 females (SYNU-271–273), same data as holotype . Etymology. The specific name is a noun in apposition from the type locality. Diagnosis. This new species is similar to Trilacuna gongshan Tong, Zhang & Li, 2019 , but males can be distinguished by the broad sickle-shaped branch of embolus system ( Fig. 3E, H ), and females by the large globular structure of the endogyne ( Fig. 5B ). T. gongshan males have three long, tooth-like lobes of embolus system, and females have a very small globular structure of endogyne ( Tong et al. 2019 : figs 11B, D, 24H). Description. Male ( holotype , SYNU-264). Body yellow, chelicerae and sternum lighter. Habitus as in Fig. 1A, C, E . Body length 1.97; carapace 0.93 long, 0.76 wide; abdomen 1.03 long, 0.68 wide. Carapace sides granulate; lateral margin rebordered. Six eyes, well developed, arranged in a compact group; ALE, PME and PLE subequal; ALE-PLE separated by less than ALE radius, PME touching each other; posterior row recurved from above, procurved from front ( Fig. 1B, I ). Clypeus sinuous in frontal view, anterior lateral eyes separated from edge of carapace by about 1.4 times their diameter. Mouthparts: chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised ( Fig. 1D ); endites slender, distally strongly branched ( Fig. 1D ). Sternum with radial furrows between coxae I-II, II-III, III-IV; surface medially strongly reticulated ( Fig. 1D ). Abdomen ( Fig. 1G, H ): booklung covers ovoid, surface smooth; dorsal scutum not fused to epigastric scutum; apodemes present, posterior spiracles not connected; sperm pore oval, situated between anterior and posterior spiracles. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Palp ( Figs 2 A–D, 3): orange; 0.62 long (0.19, 0.14, 0.14, 0.15); femur greatly swollen (width/length = 0.68); bulb oval, tapering apically; embolus system ( Fig. 3E, F, H ) with a broad sickle-shaped branch (ssb) in prolateral view, a median branch (mb) in dorsal view, and a lateral curved branch (lb) in retrolateral view. Female (SYNU-267): Same as male except as noted. Habitus as in Fig. 4A, C, E ; slightly larger than male. Body length 2.02, carapace 0.91 long, 0.76 wide, abdomen 1.15 long, 0.72 wide. Endites: unmodified. Epigastric area ( Figs 4G , 5A ): surface without external features. Endogyne ( Fig. 5B ): with narrow, transverse sclerite (tsc), an anterior stick-shaped sclerite (as), and a posterior large globular structure (glo); transverse bar (tba) with two lateral apodemes (ap). Distribution . Known only from the type locality ( Fig. 9 ).