Ryojius simplex, Irfan & Wang & Zhang, 2023

Irfan, Muhammad, Wang, Lu-Yu & Zhang, Zhi-Sheng, 2023, Survey of Linyphiidae spiders (Arachnida: Araneae) from Wulipo National Nature Reserve, Chongqing, China, European Journal of Taxonomy 871, pp. 1-85 : 53-56

Ryojius simplex sp. nov. (Ȓ良ǿ蛛)

urn:lsid:zoobank.org:act:3798EECE-5A0C-4578-8754-8D5DF908B300

Figs 43–45

Differential diagnosis

The new species resembles Ryojius nanyuensis (Chen & Yin, 2000) ( Figs 43–47 ; Tu et al. 2006: figs 15–23) but can be distinguished by the lamella characteristca single branched in male palp in new species ( Fig. 43A–B, D ), whereas with two branches in R. nanyuensis (Tu et al. 2006: figs 15–16); distal part of paracymbium apex L-shaped in male palp in new species ( Fig. 43B ), whereas V-shaped in R. nanyuensis (Tu et al. 2006: fig 15). In epigyne, basal part of scape not covering all of the distal part in ventral view in new species ( Fig. 44A–B ), whereas covering most of it in R. nanyuensis (Tu et al. 2006: fig 21).

Etymology

The epithet is derived from the Latin adjective ‘ simplex ’ meaning ‘simple’ and referring to the lamella characteristca of the male palp being simple, with unmodified tip ( Fig. 43A–B, D ).

Type material

Holotype CHINA • ♂; Chongqing, Wushan County, Guanyang Town, Zhuxian Township , Putao Village ; 31°15′26.72″ N, 110°4′34.11″ E; elev. 1542 m; 6 Oct. 2020; L.Y. Wang, X.W. Zhou, T.Y. Ren, J.X. Zhao and L. Xiao leg.; SWUC-T-LIN-18-01 .

Paratypes CHINA • 1 ♀; Wushan County, Guanyang Town, Zhuxian Township , Putao Village ; 31°16′8.98″ N, 110°4′34.11″ E; elev. 1445 m; 6 Oct. 2020; L.Y. Wang, X.W. Zhou, T.Y. Ren, J.X. Zhao and L. Xiao leg.; SWUC-T-LIN-18-02 .

Description

Male (holotype, Figs 43 , 45A )

MEASUREMENTS. Total 2.18 long; carapace 0.98 long, 0.80 wide; abdomen 1.10 long, 0.76 wide. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.07, PLE 0.07, AME–AME 0.02, PME–PME 0.05, AME–ALE 0.03, PME–PLE 0.05, ALE–ALE 0.31, PLE–PLE 0.33, ALE–PLE contiguous, AME–PME 0.04.

CEPHALOTHORAX. Carapace yellowish-brown, cephalic region slightly elevated; fovea, cervical and radial grooves distinct. Clypeus 0.13 high.

CHELICERAE. With six promarginal and five retromarginal teeth.

LEG MEASUREMENTS. Legs long, yellow, covered with fine spines. Length of legs: I 2.75 (0.81, 0.93, 0.61, 0.40), II 2.58 (0.73, 0.88, 0.58, 0.39), III 2.23 (0.65, 0.72, 0.51, 0.35), IV 2.72 (0.79, 0.92, 0.59, 0.42). Leg formula I-IV-II-III. TmI 0.26 and TmIV absent. Tibial spine formula: 2-2-2-2.

ABDOMEN. Oval, light grey, dorsally with three cheverons posteriorly, ventral side light grey.

PALP ( Fig. 43 ). Patella short. Tibia with strongly sclerotised dorsal apophysis pointing laterally. Distal part of paracymbium with V-shaped apex, with broad blunt end. Pit hook on suprategulum long, distally arc-shaped with pointed end. Radix anterior part long, lancet-like. Lamella characteristca transparent, short, tip unmodified, apex retained below the anterior terminal apophysis. Anterior terminal apophysis thumb-shaped, with blunt end. Embolus conspicuously large, posteriorly curved about half circle, with conspicuous serrated area, embolus proper blunt, apex strongly sclerotized.

Female (paratype, SWUC-T-LIN-18-02, Figs 44 , 45B )

MEASUREMENTS. Total 1.83 long; carapace 0.82 long, 0.64 wide; abdomen 1.29 long, 0.58 wide. Eye sizes and interdistances: AME 0.04, ALE 0.06, PME 0.06, PLE 0.07, AME–AME 0.01, PME–PME 0.04, AME–ALE 0.02, PME–PLE 0.04, ALE–ALE 0.26, PLE–PLE 0.29, ALE–PLE contiguous, AME–PME 0.05.

CEPHALOTHORAX. Same as in male. Clypeus 0.12 high.

CHELICERAE. With six promarginal and five retromarginal teeth.

LEG MEASUREMENTS. Legs long, yellow, covered with fine spines. Length of legs: I 2.20 (0.64, 0.76, 0.43, 0.37), II 1.94 (0.57, 0.66, 0.39, 0.32), III 1.67 (0.49, 0.52, 0.36, 0.32), IV 2.11 (0.63, 0.70, 0.44, 0.34). Leg formula I-IV-II-III. TmI 0.24 and TmIV absent. Tibial spine formula: 2-2-2-2.

ABDOMEN. Same as in male.

EPIGYNE ( Fig. 44 ). Scape wider than long, basal part of scape posteriorly C-shaped; distal part of scape grooved with lateral pockets on inner surface. Stretcher conspicuous, tongue-shaped. Posterior median plate broad, somewhat rectangular. Spermathecae globular, situates dorso–laterally.

Distribution

Known from type locality.

Figures

Fig. 43. Ryojius simplex sp. nov., ♂ holotype, left palp (SWUC-T-LIN-18-01). A. Prolateral view. B. Retrolateral view. C. Ventral view. D. Dorsal view.

Fig. 44. Ryojius simplex sp. nov., ♀ paratype (SWUC-T-LIN-18-02). A, C. Epigyne, ventral view. B. Epigyne, lateral view. D. Vulva, dorsal view.

Fig. 45.Ryojius simplex sp. nov., habitus, dorsal view. A. Holotype ♂ (SWUC-T-LIN-18-01). B. Paratype ♀ (SWUC-T-LIN-24-02).

Fig. 46. Stemonyphantes bifurcus sp. nov., holotype ♂ (SWUC-T-LIN-19-01), left palp. A. Prolateral view. B. Retrolateral view. C. Ventral view. D. Dorsal view.

Fig. 47. Tapinopa guttata Komatsu, 1937, ♀ (SWUC-T-LIN-21-01). A, C–D. Epigyne, ventral view. B. Epigyne, lateral view. E. Vulva, anterior view.