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).