Shinobius yulong Zhang, Yu & Zhang 2024, sp. nov.
Creators: name: Zhang, Haibin
name: Yu, Kun
name: Zhang, Feng
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Trechaleidae
Shinobius
Shinobius yulong

description: Shinobius yulong Zhang, Yu & Zhang sp. nov. (ṮŽ侵Ʀ)
Figs 1–5
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.
Paratype: 1♀ (MHBU-ARA-2023-814-2), with same data as holotype.
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) vs. less than half the width (Sierwald 1993: figs 20, 22); 2) copulatory openings semicircular, located at posterior edge of epigyne (Figs 4A–C) vs. circular, located in the middle of epigyne (Sierwald 1993: fig. 15); 3) stalk of spermatheca bent inwards (Fig. 4B) vs. bent upwards (Sierwald 1993: fig. 16). It differs from S. cona in: 1) the median apophysis divided into two branches (Figs 2, 3A, C) vs. unbifurcated (Wang et al. 2024: figs 2A, 3A); 2) the outer margin of membrane between tegulum and median apophysis relatively smooth (Figs 2A, 3C) 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) vs. cylindrical, half hidden behind the stalk of spermatheca (Wang et al. 2024: figs 2D, 3G).
Description. Male holotype (Figs 1A, D, F, 2, 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). Color in ethanol (Fig. 1A): 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): 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, 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). Coloration (Figs 1B–C) like male, but opisthosoma without chevron-like white stripes.
Epigyne (Figs 4A, C–D): epigynal plate trapezoid, with a pair of lateral folds. Vulva (Fig. 4B): head of spermatheca spherical, significantly enlarged; accessory spermathecae finger-shaped; stalk of spermatheca C-shaped; copulatory ducts short and wide.
Distribution. China (Xizang).
description: Published as part of Zhang, Haibin, Yu, Kun & Zhang, Feng, 2024, The third species of the genus Shinobius Yaginuma, 1991 from Asia (Araneae, Trechaleidae), pp. 141-146 in Zootaxa 5537 (1) on pages 141-146, DOI: 10.11646/zootaxa.5537.1.8, http://zenodo.org/record/14239399