Dicymbium pingqianense, 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 : 13-17

Dicymbium pingqianense sp. nov. (前双舟蛛)

urn:lsid:zoobank.org:act:D0705FE9-9526-49A9-ABE1-8F74EEEAE35F

Figs 7–9

Differential diagnosis

The new species resembles Dicymbium sinofacetum Tanasevitch, 2006 in having the tibia with similar retrolateral tibial apophysis, anterior redical process and epigyne with similar ventral and dorsal plates ( Figs 7–8 ; Song & Li 2008: figs 1–3, 12), but can be distinguished by the embolus with two loops in new species ( Fig. 7B ), whereas with one loop in D. sinofacetum ( Song & Li 2008: fig. 2); tailpiece oval in new species ( Fig. 7A ), whereas with foot-shaped in D. sinofacetum ( Song & Li 2008: fig. 3); spermathecae head separated by a minimal distance in new species ( Fig. 8D ), whereas the gap between spermathecae relatively large in D. sinofacetum ( Song & Li 2008: fig. 10).

Etymology

This epithet derives from the type locality.

Type material

Holotype CHINA ♂; Chongqing, Wushan County, Guanyang Town, Pingqian Management Station ; 31°22′22.75″ N, 109°56′17.25″ E; elev. 1832 m; 6 Oct. 2020; L.Y. Wang, X.W. Zhou, T.Y. Ren, J.X. Zhao and L. Xiao leg.; SWUC-T-LIN-05-01 .

Paratypes CHINA • 2 ♂♂, 4 ♀♀; same collection data as for holotype; SWUC-T-LIN-05-02–07 • 1 ♂; Wushan County, Dangyang Town , Congping Mountain ; 31°23′47.16″ N, 110°2′28.04″ E; elev. 2150 m; 3 Oct. 2020; L.Y. Wang, X.W. Zhou, T.Y. Ren, J.X. Zhao and L. Xiao leg.; SWUC-T-LIN-05-08 .

Description

Male (holotype, Figs 7 , 9A )

MEASUREMENTS. Total 1.76 long; carapace 0.87 long, 0.67 wide; abdomen 0.99 long, 0.67 wide. Eye sizes and interdistances: AME 0.03, ALE 0.08, PME 0.07, PLE 0.07, AME–AME 0.02, PME–PME 0.03, AME–ALE 0.05, PME–PLE 0.04, ALE–ALE 0.31, PLE–PLE 0.33, ALE–PLE 0.01, AME–PME 0.10.

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

CHELICERAE. With five promarginal and five retromarginal teeth.

LEG. Legs long, yellow, covered with fine spines. Length of legs: I 2.51 (0.74, 0.81, 0.54, 0.42), II 2.33 (0.70, 0.74, 0.51, 0.38), III 2 (0.59, 0.62, 0.45, 0.34), IV 2.69 (0.79, 0.91, 0.58, 0.41). Leg formula IV-I-II-III. TmI 0.41 and TmIV absent. Tibial spine formula: 2-2-1-1.

ABDOMEN. Oval, light gray, densely covered with fine spines, ventral side light gray.

PALP ( Fig. 7 ). Patella as long as tibia, relatively broad at distal end. Tibia narrowed distally; with vimineous bifurcate prolateral tibial apophysis strongly curved to retrolateral side; with complicated retrolateral tibial apophysis composed of triangular upper and nether part; with two retrolateral and one prolateral tibial trichobothria. Paracymbium sclerotized, distal arm hook-shaped ( Fig. 2 ). Protegulum reduced or absent. Suprategulum with two apophyses, marginal suprategular apophysis arc-shaped with blunt end; distal suprategular apophysis trifurcate, the small branch of which is mostly covered by the outer two large branches. Anterior radical process long and narrow, with membranous lower surface. Tailpiece curved upwards, oval in prolateral view. Embolus two loops, with a narrow membrane along the inner margin.

Female (paratype, SWUC-T-LIN-05-02, Figs 8–9B )

MEASUREMENTS. Total 2.03 long; carapace 0.85 long, 0.66 wide; abdomen 1.25 long, 0.84 wide. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.07, PLE 0.06, AME–AME 0.01, PME–PME 0.03, AME–ALE 0.04, PME–PLE 0.04, ALE–ALE 0.27, PLE–PLE 0.28, ALE–PLE 0.01, AME–PME 0.10.

CEPHALOTHORAX. Same as in male. Clypeus 0.12 high.

CHELICERAE. With five promarginal and five retromarginal teeth.

LEG MEASUREMENTS. Legs long, yellow, covered with fine spines. Length of legs: I 2.58 (0.75, 0.85, 0.54, 0.44), II 2.33 (0.68, 0.76, 0.48, 0.41), III 1.99 (0.57, 0.65, 0.44, 0.33), IV 2.70 (0.82, 0.92, 0.57, 0.39). Leg formula IV-I-II-III. TmI 0.39 and TmIV absent. Tibial spine formula: 2-2-1-1.

ABDOMEN. Same as in male.

EPIGYNE ( Fig. 8 ). Elliptical with a longitudinal fissure in the center. Dorsal plate triangular, with posterior margins turned up. A pair of semicircular depressions present along the posterior margins of epigyne. Spermathecae oblong and separated by a minimal distance. Copulatory ducts expanded at the beginning to be sac-shaped and followed by a broad loop before entering into spermathecae. Fertilization ducts posteriorly orientated and C-shaped.

Distribution

Known from type locality.

Figures

Fig. 7. Dicymbium pingqianense sp. nov., ♂ holotype left palp (SWUC-T-LIN-05-01). A. Prolateral view. B. Retrolateral view. C. Dorsal view. D. Ventral view.

Fig. 8. Dicymbium pingqianense sp. nov., ♀ (paratype, SWUC-T-LIN-05-02). A, C. Epigyne, ventral view. B. Epigyne, lateral view. D. Vulva, anterior view.

Fig. 9. Dicymbium pingqianense sp. nov., habitus, dorsal view. A. Holotype, ♂ (SWUC-T-LIN-05-01). B. Paratype, ♀ (SWUC-T-LIN-05-02).

Fig. 2. Agyneta orthogonia sp. nov., ♀ (one of paratypes, SWUC-T-LIN-03-02). A, C. Epigyne, ventral view. B. Epigyne, lateral view. D. Epigyne, dorsal view. E. Vulva, anterior view.