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 Key to species of the genus Trilacuna occurring in China (females of T. angularis and T. cuneata unknown) 1 (0) Males............................................................................................. 2 - Females.......................................................................................... 15 2 (1) Epigastric region strongly elevated (e.g., Fig. 6H ; Liu et al. 2019: fig. 1E; Tong et al. 2019 : figs 1I, 4I, 7I, 19I).......... 3 - Epigastric region flat................................................................................. 8 3 (2) Epigastric region with a long wedge-shaped scape (Liu et al. 2019: fig. 1E, F)................... T. cuneata Tong, 2019 - Epigastric region without the long wedge-shaped scape...................................................... 4 4 (1) Epigastric region with four long, very thick setae; sternum with many short, italic thick setae ( Tong et al. 2019 : fig. 4E, H, I)....................................................................... T. datang Tong, Zhang & Li, 2019 - Without the above-mentioned characters.................................................................. 5 5 (4) Epigastric region with a cluster of densely short seta ( Fig. 6G ).................................. T. wenfeng sp. nov. - Epigastric region without the above-mentioned character.................................................... 6 6 (5) Sternum with several grooves on posterior part ( Tong et al. 2019 : fig. 1E)............. T. bawan Tong, Zhang & Li, 2019 - Sternum without grooves on posterior part................................................................ 7 7 (6) Sternum with a cluster of short setae on posterior part; embolus system with comb-like prolateral lobes ( Tong et al. 2019 : figs 19E, 20B)............................................................... T. xinping Tong, Zhang & Li, 2019 - Sternum without cluster of short setae on posterior part; embolus system without comb-like prolateral lobes, but with rows of lobes in basal ventral groove and a large distal plate ( Tong et al. 2019 : figs 7E, 8C)..... T. fugong Tong, Zhang & Li, 2019 8 (2) Embolus system with two very long, strongly curved outgrowths ( Tong et al. 2018 : fig. 2C, D)................................................................................................. T. simianshan Tong & Li, 2018 - Embolus system without the above-mentioned character..................................................... 9 9 (8) Palpal tibia with numerous, very long, penniform setae on prolateral surface and two long, strong setae on retrolateral surface; posterior part of sternum with two elevated ridges, each covered with a row of short, strong setae ( Tong et al. 2018 : figs 6E, 7C, D)....................................................................... T. songyuae Tong & Li, 2018 - Without the above-mentioned characters................................................................. 10 10 (9) Sternum with many rows of small ridges on posterior area ( Tong et al. 2019 : figs 13E, 16E)........................ 11 - Sternum without small ridges on posterior area........................................................... 12 11 (10) Embolus system with four long, finger-like lobes and two distal broad lobes prolaterally ( Tong et al. 2019 : fig. 17B)............................................................................... T. wuhe Tong, Zhang & Li, 2019 - Embolus system with two narrow, blade-like lobes prolaterally ( Tong et al. 2019 : fig. 14B)................................................................................................ T. longling Tong, Zhang & Li, 2019 12 (10) Endites distally slightly branched; embolus system with three long, tooth-like lobes prolaterally ( Tong et al. 2019 : figs 10E, 11B, D)............................................................... T. gongshan Tong, Zhang & Li, 2019 - Endites distally strongly branched; embolus system without three long, tooth-like lobes prolaterally................. 13 13 (12) Embolus system with a broad sickle-shaped branch prolaterally ( Figs 2C , 3E )....................... T. difeng sp. nov. - Embolus system without a broad sickle-shaped branch prolaterally............................................ 14 14 (13) Base of embolus system strongly bulged prolaterally ( Tong & Li 2007 : fig. 15)............. T. angularis Tong & Li, 2007 - Base of embolus system not bulged ( Tong & Li 2007 : fig. 9)............................. T. rastrum Tong & Li, 2007 15 (1) Surface of sternum strongly rugose ( Tong et al. 2019 : fig. 6E)...................... T. datang Tong, Zhang & Li, 2019 - Surface of sternum not strongly rugose.................................................................. 16 16 (15) Surface of sternum reticulated (e.g., Fig. 4D ; Tong et al. 2018 : figs 5E, 10E).................................... 17 - Surface of sternum smooth, or slightly rugose on middle part................................................ 19 17 (16) Middle part of posterior margin of epigastric scutum strongly extended posteriorly; endogyne with a very long, nearly coneshaped structure ( Tong et al. 2018 : figs 5H, I)..................................... T. simianshan Tong & Li, 2018 - Posterior margin of epigastric scutum smoothly curved, not strongly extended posteriorly; endogyne with a small globular shaped structure (e.g., Fig. 5A, B ; Tong et al. 2018 : figs 10H, I).............................................. 18 18 (17) Epigastric region with a pair of large dark knob; globular structure of endogyne very small ( Tong et al. 2018 : fig. 10H, I).............................................................................. T. songyuae Tong & Li, 2018 - Epigastric region without large dark knob; globular structure of endogyne large ( Fig. 5A, B )........... T. difeng sp. nov. 19 (16) Surface of sternum slightly rugose on middle part ( Tong et al. 2019 : figs 15E, 18E).............................. 20 - Surface of sternum smooth........................................................................... 21 20 (19) Middle part of anterior margin of postgastric scutum smooth ( Tong et al. 2019 : fig. 24I)................................................................................................... T. longling Tong, Zhang & Li, 2019 - Middle part of anterior margin of postgastric scutum arch-shaped ( Tong et al. 2019 : fig. 25A)................................................................................................. T. wuhe Tong, Zhang & Li, 2019 21 (19) Endogyne with a posterior horseshoe-shaped sclerite ( Tong et al. 2019 : fig. 24F)........ T. fugong Tong, Zhang & Li, 2019 - Endogyne without horseshoe-shaped sclerite............................................................. 22 22 (21) Endogyne with only a transverse bar ( Fig. 5D ; Tong et al. 2019 : fig. 25D)...................................... 23 - Endogyne with two transverse sclerites, i.e., an anterior transverse sclerite and a posterior transverse bar.............. 24 23 (22) Transverse bar of endogyne nearly straight ( Fig. 5D ).......................................... T. wenfeng sp. nov. - Transverse bar of endogyne strongly curved ( Tong et al. 2019 : fig. 25D)............. T. xinping Tong, Zhang & Li, 2019 24 (22) Recurved arches of epigastric region weakly sclerotized ( Tong et al. 2019 : fig. 24G, H).................................................................................................. T. gongshan Tong, Zhang & Li, 2019 - Recurved arches of epigastric region strongly sclerotized ( Tong et al. 2019 : fig. 24A)............................. 25 25 (24) Transverse bar of endogyne straight; ALE separated by about 1.0 times their diameter; clypeus height about 1.1 times ALE diameters ( Tong et al. 2019 : fig. 3H).......................................... T. bawan Tong, Zhang & Li, 2019 - Transverse bar of endogyne curved; ALE separated by about 1.3 times their diameter; clypeus height about 2.0 times ALE diameters ( Tong & Li 2007 : fig. 5)................................................. T. rastrum Tong & Li, 2007