Trilacuna jiuchi Tong, Zhang & Li, 2021

Huang, Ying, Bian, Dong-Ju, Tong, Yan-Feng, Zhang, Zhi-Sheng & Li, Shu-Qiang, 2021, Two new species of the genus Trilacuna (Araneae: Oonopidae) from Jinyun Mountain of Chongqing, China, European Journal of Taxonomy 748, pp. 1-14 : 8-13

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.

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

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 ).

Figures

Fig. 4. A–B. Trilacuna jinyun Tong, Zhang & Li sp. nov., holotype, ♂ (SYNU-291). C–D. T. jiuchi Tong, Zhang & Li, sp. nov., holotype, ♂ (SYNU-300). E–F. T. jinyun sp. nov., paratype, ♀ (SYNU- 292). G–H. T. jiuchi sp. nov., paratype, ♀ (SYNU-303). A, C. Left palp, prolateral view. B, D. Left palp, retrolateral view. E, G. Epigaster, ventral view. F, H. Endogyne, dorsal view. Abbreviations: ap = apodeme; as = anterior sclerite; pe = posterior extension; psp = posterior spiracle; rss = rectangular shaped structure; sar = sclerotized, recurved arches; sls = slender line-like structure; tba = transverse bars; tsc = transverse sclerite; wss = worm-shaped structure. Scale bars: 0.2 mm.

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.

Fig. 8. The type locality of the two new species, Jinyun Mountain, Chongqing.