Shinobius yulong Zhang, Yu & Zhang, 2024

Zhang, Haibin, Yu, Kun & Zhang, Feng, 2024, The third species of the genus Shinobius Yaginuma, 1991 from Asia (Araneae, Trechaleidae), Zootaxa 5537 (1), pp. 141-146 : 141-146

publication ID	https://doi.org/ 10.11646/zootaxa.5537.1.8
persistent identifier	https://treatment.plazi.org/id/035B87AC-7635-5F28-FF11-F8C67404CB64
treatment provided by	Plazi
scientific name	Shinobius yulong Zhang, Yu & Zhang
status	sp. nov.

Treatment

Shinobius yulong Zhang, Yu & Zhang sp. nov. (ṮŽ侵Ʀ)

Figs 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5

Type material. Holotype ♂ (MHBU-ARA-2023-814-1), CHINA: Xizang Autonomous Region, Rigaze City , Dingkye County, Zhentang Town (27°52′29.43′′N, 87°24′54.78′′E, alt. 2271.7 m), 16 July 2023, leg. Xiangbo Guo and Haibin Zhang. GoogleMaps

Paratype: 1♀ (MHBU-ARA-2023-814-2), with same data as holotype GoogleMaps .

Etymology. The specific name refers to Hongshan Jade Dragon, a national cultural relic of China, whose C- shape resembles this species spermatheca. Noun in apposition.

Diagnosis. The new species resembles S. orientalis and S. cona in the shape of palpal bulb and conductor, and absence of RTA (see Sierwald 1993; Wang et al. 2024), but it can be distinguished from S. orientalis by: 1) the width of the median apophysis over half that of the bulb in ventral view ( Fig. 2A View FIGURE 2 ) vs. less than half the width ( Sierwald 1993: figs 20, 22); 2) copulatory openings semicircular, located at posterior edge of epigyne ( Figs 4A–C View FIGURE 4 ) vs. circular, located in the middle of epigyne ( Sierwald 1993: fig. 15); 3) stalk of spermatheca bent inwards ( Fig. 4B View FIGURE 4 ) vs. bent upwards ( Sierwald 1993: fig. 16). It differs from S. cona in: 1) the median apophysis divided into two branches ( Figs 2 View FIGURE 2 , 3A, C View FIGURE 3 ) vs. unbifurcated ( Wang et al. 2024: figs 2A, 3A); 2) the outer margin of membrane between tegulum and median apophysis relatively smooth ( Figs 2A View FIGURE 2 , 3C View FIGURE 3 ) vs. arched ( Wang et al. 2024: figs 2A, 3A, C); 3) the head of spermatheca spherical, visible in the dorsal view of vulva ( Fig. 4B View FIGURE 4 ) vs. cylindrical, half hidden behind the stalk of spermatheca ( Wang et al. 2024: figs 2D, 3G).

Description. Male holotype ( Figs 1A, D, F View FIGURE 1 , 2 View FIGURE 2 , 3 View FIGURE 3 ). Total length 4.28; carapace 2.13 long, 1.75 wide; opisthosoma 2.37 long, 1.67 wide. Eye sizes and interdistances: AME 0.11, ALE 0.10, PME 0.14, PLE 0.15; AME‒AME 0.09, AME‒ALE 0.05, ALE‒ALE 0.40, PME‒PME 0.09, PME‒PLE 0.16, PLE‒PLE 0.63, ALE‒PLE 0.24. OAW 0.84, CRW 0.99, OAW/ CRW 0.85, MOA 0.36 long, anterior width 0.29, posterior width 0.40. CH 0.13, CH /AME 1.18. Labium 0.35 long, 0.38 wide. Sternum 1.11 long, 1.12 wide. Leg measurements: Ⅰ 7.80 (2.16, 0.62, 2.06, 1.91, 1.05), II 7.79 (2.23, 0.71, 1.97, 1.97, 0.91), III 6.87 (2.03, 0.62, 1.69, 1.70, 0.83), IV 8.08 (2.27, 0.70, 1.90, 2.31, 0.90); leg formula 4123. Leg spination: Ⅰ: Fe d3, Ti pv3 rv3, Mt pv3 rv3; II: Fe d3, Ti pv3 rv3, Mt pv3 rv3; III: Fe d3, Ti pv3 rv3, Mt pv3 rv3; IV: Fe d3, Ti pv3 rv3, Mt pv3 rv3. Chelicerae promargin with three teeth, retromargin with three teeth ( Fig. 1D View FIGURE 1 ). Color in ethanol ( Fig. 1A View FIGURE 1 ): carapace brownish-yellow, radial furrows blackish-brown and median fovea reddish-brown. Legs pale-yellow with brown rings on femur, tibia and metatarsus. Opisthosoma black-grey with irregular white marking and several chevron-like white stripes posteriorly.

Palp ( Fig. 2 View FIGURE 2 ): RTA absent, replaced by a sclerotized hood; median apophysis heavily sclerotized, with broad base and two tips, dorsal division hook-shaped; conductor finger-shaped, membranous; sperm duct meandering; embolus arcshaped, behind the median apophysis, tip slightly curved towards the dorsal side.

Female paratype ( Figs 1B–C, E View FIGURE 1 , 4 View FIGURE 4 ). Total length 5.35; carapace 2.38 long, 1.97 wide; opisthosoma 3.27 long, 2.45 wide. Eye sizes and inter-distances: AME 0.12, ALE 0.11, PME 0.15, PLE 0.14; AME ‒ AME 0.10, AME ‒ ALE 0.10, ALE ‒ ALE 0.46, PME ‒ PME 0.13, PME ‒ PLE 0.24, PLE ‒ PLE 0.76, ALE ‒ PLE 0.29. OAW 1.01, CRW 1.22 , OAW/ CRW 0.83, MOA 0.38 long, anterior width 0.33, posterior width 0.45. CH 0.13, CH / AME 1.18 . Labium 0.43 long, 0.46 wide. Sternum 1.19 long, 1.24 wide. Leg measurements: I 8.07 (2.31, 0.78, 2.09, 1.91, 0.98), II 8.16 (2.37, 0.75, 2.18, 1.98, 0.88), III 7.49 (2.25, 0.76, 1.78, 1.84, 0.86), IV 8.60 (2.46, 0.71, 1.97, 2.45, 1.01), leg formula 4213. Leg spination and chelicerae teeth on each of retro- and pro-margin as in male ( Fig. 1E View FIGURE 1 ). Coloration ( Figs 1B–C View FIGURE 1 ) like male, but opisthosoma without chevron-like white stripes .

Epigyne ( Figs 4A, C–D View FIGURE 4 ): epigynal plate trapezoid, with a pair of lateral folds. Vulva ( Fig. 4B View FIGURE 4 ): head of spermatheca spherical, significantly enlarged; accessory spermathecae finger-shaped; stalk of spermatheca C-shaped; copulatory ducts short and wide.

Distribution. China (Xizang).