Microneta circumacta Irfan, Zhang & Peng

Irfan, Muhammad, Zhou, Gu-Chun, Peng, Xian-Jin & Zhang, Zhi-Sheng, 2025, Survey of Linyphiidae spiders (Arachnida: Araneae) from some Oriental Regions of China, Megataxa 15 (1), pp. 1-248 : 110

publication ID	https://doi.org/10.11646/megataxa.15.1.1
DOI	https://doi.org/10.5281/zenodo.14985449
persistent identifier	https://treatment.plazi.org/id/03CD8788-8D56-FFA4-4AD1-CC93A972FB3C
treatment provided by	Plazi (2025-03-05 10:47:13, last updated 2025-03-07 18:45:59)
scientific name	Microneta circumacta Irfan, Zhang & Peng
status	sp. nov.

Treatment

Microneta circumacta Irfan, Zhang & Peng , sp. n.

(àäạe)

Figures 142 View FIGURE 142 , 143 View FIGURE 143 , 317 View FIGURE 317 .

Types. Holotype ♂ ( HNU–XZ–0004 ), CHINA, Xizang Linzhi city, Bomi Co., Gongxiang Guangde Vill. , 30.28173°N, 94.76779°E, 2238 m, 12.I.2017, Q. Cai leg. GoogleMaps

Etymology. The specific epithet is derived from the Latin adjective “circumactus” meaning “curved” and referring to curved embolus in male palp.

Diagnosis. Microneta circumacta sp. n. resembles M. acutalis sp. n. and M. viaria in having the similar paracymbium ( Figs 142A–D View FIGURE 142 ; Figs 139A–D View FIGURE 139 ; Wiehle 1956, figs 217–222, Zhang et al. 2022, figs 43E–G), but can be distinguished by the proximal cymbial apophysis about half the width of proximal end of tibia in M. circumacta sp. n. ( Fig. 142D View FIGURE 142 ; vs. almost as wide as proximal end of tibia in M. acutalis sp. n. and about more than half the width of proximal end of tibia in M. viaria ); the tip of embolus away from tip of tegulum, perpendicular to the distal arm of paracymbium in prolateral view in M. circumacta sp. n. ( Figs 142A, B View FIGURE 142 ), vs. almost touches the tegulum, parallel to the distal arm of paracymbium in M. acutalis sp. n. and touches both the tip of tegulum and the distal arm of paracymbium in prolateral view in M. viaria ).

Description: Male ( Figs 143A, B View FIGURE 143 ): Total length: 2.52; carapace 1.17 long, 0.95 wide, yelowish brown, fovea, cervical and radial grooves distinct. Clypeus 0.29 high. Chelicerae with two promarginal and four retromarginal teeth. Sternum longer than wide, brown with microsetae. Eyes: AER recurved, PER straight and slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.07, PLE 0.08, AME–AME 0.03, PME–PME 0.05, AME–ALE, 0.03, PME–PLE 0.04, ALE–ALE 0.31, PLE–PLE 0.34, ALE–PLE 0.02. Length of legs: I 3.57 (1.01, 1.17, 0.80, 0.59), II 3.21 (0.94, 1.03, 0.74, 0.50), III 2.75 (0.76, 0.92, 0.64, 0.43), IV 3.87 (1.06, 1.31, 0.94, 0.56). TmI and TmIV present. Tibial spine formula: 2-2- 2-2. Opisthosoma 1.44 long, 0.96 wide, oval, greenish black.

Palp ( Figs 142A–D View FIGURE 142 ): Femur unmodified, almost longer than both patella and tibia. Patella as long as tibia, ventrally grooved. Tibia conic, with two retrolateral and one dorsal trichobothria; cymbium truncated, retrolateral margin with a shallow depression at the base, proximal cymbial apophysis (PCA), quadrate, with blunt end; paracymbium (PC) apical pocket (appo) long, anterior pocket (apo) curved, posterior pocket short and curved, the basal part with spines. Pit hook ( PH) basally broad leaf-shaped distally with curved pointed end. Radix (R) with a small projection at the base of embolus, with sclerotized curved tip; median membrane (MM) well-developed with serrated margin, lamella characteristica (LC) with two spikes and ending in a large prong; terminal apophysis (TA) flap-like, widened at distal end, tip with several teeth; embolus (E) crescent shaped with pointed tip, perpendicular to the cymbium; thumb (TH) reaching below the embolus.

Female: Unknown.

Distribution: Known only from the type locality (Xizang Province, Fig. 317 View FIGURE 317 ).

References

Wiehle, H. (1956) Spinnentiere oder Arachnoidea (Araneae). 28. Familie Linyphiidae - Baldachinspinnen. Die Tierwelt Deutschlands, 44, 1-337.

Zhang, F., Peng, J. Y. & Zhang, B. S. (2022) Spiders of Mt. Xiaowutai. Science Press, Beijing, 387 pp.

Figures

FIGURE 139. Microneta acutalis sp. n., male holotype. A Palp, prolateral view; B Palp, retrolateral view; C Palp, ventral view; D Palp, dorsal view. Abbreviations: apo—anterior pocket of paracymbium; appo—apical pocket of paracymbium; E—embolus; LC—lamella characteristica; MM—median membrane; PC—paracymbium; PCA—proximal cymbial apophysis; PH—pit hook; R—radix; ST—subtegulum; T—tegulum; TA—terminal apophysis.

FIGURE 142. Microneta circumacta sp. n., male holotype. A Palp, prolateral view; B Palp, retrolateral view; C Palp, ventral view; D Palp, dorsal view. Abbreviations: apo—anterior pocket of paracymbium; appo—apical pocket of paracymbium; E—embolus; LC—lamella characteristica; MM—median membrane; PC—paracymbium; PCA—proximal cymbial apophysis; PH—pit hook; R—radix; ST—subtegulum; T—tegulum; TA—terminal apophysis.

FIGURE 143. Microneta circumacta sp. n., male holotype. A Habitus, dorsal view; B Habitus, ventral view.

FIGURE 317. Distribution of Linyphiidae species in Xizang: 1. Microneta circumacta sp. n.; 2. Oilinyphia daxuensis sp. n.; 3. Walckenaeria furcillata (Menge, 1869).