Two new species of the genus Trilacuna (Araneae: Oonopidae) from Jinyun Mountain of Chongqing, China Author Huang, Ying 7FB9DDA5-BFC3-4E8D-9CBF-7ABD84306930 Life Science College, Shenyang Normal University, Shenyang 110034, China. CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang 110016, China. Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Life Sciences, Southwest University, Chongqing 400715, China. Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. 345232897@qq.com Author Bian, Dong-Ju 45B9F05A-435A-4627-B8EA-C7D210C97EED biandongju@163.com Author Tong, Yan-Feng F8825B06-6F62-464F-A525-B186D386B829 Life Science College, Shenyang Normal University, Shenyang 110034, China. CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang 110016, China. Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Life Sciences, Southwest University, Chongqing 400715, China. Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. Author Zhang, Zhi-Sheng B3A56DD2-41DD-4C80-A749-19AAC88A5E4A lisq@ioz.ac.cn Author Li, Shu-Qiang 03E71F9A-5676-4D54-8266-50B00709BE44 Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. lisq@ioz.ac.cn text European Journal of Taxonomy 2021 2021-04-29 748 1 14 http://dx.doi.org/10.5852/ejt.2021.748.1337 journal article 7152 10.5852/ejt.2021.748.1337 5f641674-ff3f-402a-958a-001031667efc 2118-9773 5542519 9BCE8FEC-8EE0-403D-AC83-14D3EF398589 Trilacuna jiuchi Tong, Zhang & Li sp. nov. urn:lsid:zoobank.org:act: 40D388B1-B955-48EA-860B-01C7D9A6EBD2 Figs 4C–D, G–H , 5–8 Differential diagnosis Males of this new species are similar to the males of Trilacuna angularis Tong & Li, 2007 and T. rastrum Tong & Li, 2007 , but can be distinguished by the nine-teeth-rake like sclerite and the fork like sclerite of the embolus system ( Fig. 6E–H ). Males of T. angularis and T. rastrum both have a four-teeth-rake like sclerite but lack the fork like sclerite ( Tong & Li 2007 : figs 5–10, 15–18). Females of this new species are similar to the females of Trilacuna rastrum Tong & Li, 2007 , but can be separated by the wormshaped structure of the endogyne, which is not present in T. rastrum ( Tong & Li 2007 : fig. 6). Etymology The specific name is derived from the Chinese pinyin, 'jiuchi', which means 'nine teeth', referring to the nine-teeth-rake like sclerite of the male embolus system. Material examined Holotype CHINA • ♂ ; Chongqing Municipality , Beibei District , Jinyun Mountain , Caijiagou ; 29°50ʹ19.368ʺ N , 106°21ʹ47.142ʺ E ; 15 Oct. 2014 ; Yanfeng Tong and Songyu Lv leg.; SYNU-300 . Paratypes CHINA • 2 ♂ , 3 ♀♀ ; same collection data as for holotype; SYNU-301 to 305 • 2 ♂ , 4 ♀♀ ; Jinyun Mountain , Baiyunguan Temple ; 20 Mar. 2010 ; Zongxu Li , Luyu Wang , Hupeng Wang and Kaiyi Xu leg.; SYNU-306 to 311 • 2 ♂ , 26 ♀♀ ; Jinyun Mountain ; 7 Jun. 2011 ; Zhisheng Zhang , Zhong Li and Luyu Wang leg.; SWUC-T-OO-02-1 to 28 • 2 ♂ , 15 ♀♀ ; Jinyun Mountain ; 10 Apr. 2010 ; Zongxu Li , Luyu Wang and Kaiyi Xu leg.; SYNU-340 to 356 . Other material CHINA • 2 ♂ , 1 ♀ ; Jinyun Mountain , Caijiagou ; 12 Dec. 2010 ; Zhisheng Zhang et al. leg.; SYNU- 357 to 359 • 3 ♀♀ ; Jinyun Mountain , Canal Protection Station ; 4 Dec. 2010 ; Zhong Li and Zongxu Li leg.; SYNU-360 to 362 • 1 ♂ , 1 ♀ ; Jinyun Mountain ; 16 Oct. 2011 ; Zongxu Li , Zhong Li , Luyu Wang , Dong Wang and Mingxin Liu leg.; SYNU-363 to 364 • 1 ♀ ; Jinyun Mountain , Canal Protection Station ; 11 May 2008 ; Zhisheng Zhang leg.; SYNU-365 • 1 ♀ ; Jinyun Mountain , Jinyun Village , bamboo forest ; 28 Jun. 2009 ; Luyu Wang and Hupeng Wang leg.; SYNU-366 • 1 ♀ ; Jinyun Mountain , Caijiagou ; 12 Dec. 2010 ; Zhisheng Zhang leg.; SYNU-367 • 1 ♀ ; Jinyun Mountain ; 3 Nov. 2011 ; Luyu Wang and Mingxin Liu leg.; SYNU-368 . Description Male ( holotype ) BODY. Yellow; habitus as in Fig. 5A–C ; body length 1.70. CARAPACE ( Fig. 5D, F–G ). 0.86 long, 0.73 wide; sides granulate; lateral margin rebordered. Fig. 5. Trilacuna jiuchi Tong, Zhang & Li sp. nov. , holotype, ♂ (SYNU-300). A–C . Habitus in dorsal, ventral, and lateral views. D–G . Prosoma in dorsal, ventral, lateral, and anterior views. Abbreviations: ehb = elevated hair base; ldi = labium deep incision; sdb = strongly curved distal branch. Scale bars: 0.4 mm. Fig. 6. Trilacuna jiuchi Tong, Zhang & Li sp. nov. , left male palp, SEM, holotype, ♂ (SYNU-300). A–B , G . Prolateral, retrolateral, and dorsal views. C–D . Palpal bulb in prolateral and retrolateral views. E–F , H . Distal part of palpal bulb in prolateral, retrolateral, and dorsal views. Abbreviations: bp = basal protrusion; fls = fork like sclerite; lb = lateral branch; mb = median branch; rls = nine-teeth-rake like sclerite. Fig. 7. Trilacuna jiuchi Tong, Zhang & Li sp. nov. , paratype, ♀ (SYNU-303). A–C . Habitus in dorsal, ventral, and lateral views. D–G . Prosoma in dorsal, ventral, lateral, and anterior views. Abbreviations: ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm. EYES ( Fig. 5D, G ). Well developed, arranged in a compact group; ALE largest, PLE smallest; ALE– PLE separated by less than ALE radius, PME touching each other; posterior row recurved from above, procurved from front. CLYPEUS ( Fig. 5G ). Nearly straight in frontal view, ALE separated from edge of carapace by about 1.3 times their diameter. MOUTHPARTS ( Fig. 5E, G ). Chelicerae straight; labium rectangular, anterior margin deeply incised; endites slender, distally strongly curved branched. STERNUM ( Fig. 5E ). With radial furrows between coxae I–II, II–III, III–IV; surface reticulated. ABDOMEN ( Fig. 5A–C ). 0.91 long, 0.64 wide; booklung covers ovoid, surface smooth; apodemes present, posterior spiracles not connected; sperm pore oval, situated between anterior spiracles. LEG SPINATION (all spines longer than segment width). Legs I–II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. PALP ( Figs 6 , 4C–D ). Orange; 0.64 long (0.18, 0.15, 0.17, 0.14); femur strongly elongated (width/ length = 0.81); bulb oval shaped, tapering apically; embolus system ( Fig. 6E–F, H ) with a protrusion on Fig. 8. The type locality of the two new species, Jinyun Mountain, Chongqing. base (bp) and a fork like sclerite (fls) in prolateral view, a broad median branch (mb) and a nine-teethrake like sclerite (rls) in dorsal view, and a lateral long curved branch (lb) in retrolateral view. Female (SYNU-303) Same as male except as noted; slightly larger than male. Body: length 2.05; habitus as in Fig. 7A– C . Carapace: 0.91 long, 0.72 wide. Endites: unmodified. Abdomen: 1.22 long, 0.82 wide. Epigaster ( Figs 4G , 7B ): sclerotized recurved arches (sar) between posterior spiracles (psp) visible. Endogyne ( Fig. 4H ): with broad, transverse sclerite (tsc), a very long, nearly worm-shaped structure (wss) and an anterior sclerite (as), stick-shaped; transverse bar (tba) with two lateral apodemes (ap). Distribution China ( Chongqing ) ( Fig. 8 ).