Oilinyphioides triangularis Irfan, Zhang & Peng, sp. n.
Creators: name: Irfan, Muhammad
name: Zhou, Gu-Chun
name: Peng, Xian-Jin
name: Zhang, Zhi-Sheng
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Oilinyphioides
Oilinyphioides triangularis

description: Oilinyphioides triangularis Irfan, Zhang & Peng, sp. n.
(三ssx奥me)
Figure 184–186, 307, 315
Types. Holotype ♂ (HNU–HN– IV–1735), CHINA, Hunan Prov.: Changde City, Taoyuan Co., Shaping Town, Saiyang Vill., Wuyunjie NNR, 28.61471°N, 110.40767°E, 208 m, 06.VIII.2017, X.J. Peng et al. leg. Paratypes: 3♀ with same data as for holotype male (HNU–HN– IV–1735); 1♀, Huaihua City, Huitong Co., Tuanhe Town, Diaotang Vill., Yingzuijie NNR, 26.89206°N, 109.93273°E, 168 m, 30.X.2017, G.C. Zhou leg. (HNU–HN– IV–1770); 6♀, Xiangxi Co., Xiaoxi Town, Xiaoxi Vill., Xiaoxi NNR, 28.81125°N, 110.27326°E, 697 m, 02.VIII.2017, X.J. Peng et al. leg. (HNU–HN– IV–1724); Chongqing: 1♀, Pengshui Co., Mowei MSS, 29.16067°N, 108.03687°E, 1548 m, 23.V.2017, G.C. Zhou et al. leg. (HNU–CQ– IV– 1702); 1♀, Nanchuan Co., Dayou Town, 28.99736°N, 107.33591°E, 1021 m, 13.VIII.2015, X.J. Peng et al. leg. (HNU–CQ– IV–1508).
Etymology. The specific epithet is derived from the Latin adjective “triangularis ”, meaning “triangular” and referring to the triangular distal arm of paracymbium in male.
Diagnosis. See the diagnosis of Oilinyphioides gen. n..
Description. Male (holotype, Figs 186A, B): Total length: 1.33. Carapace 0.62 long, 0.55 wide, dark brown, round posteriorly, the ocular region narrows, with long thick setae. Clypeus 0.21 high. Chelicerae with one promarginal and two retromarginal teeth. Sternum shield-like, black with microsetae. Eyes: AER recurved, PER slightly recurved. Eye sizes and interdistances: AME 0.08, ALE 0.09, PME 0.07, PLE 0.07, AME–AME 0.01, PME–PME 0.08, AME–ALE, 0.03, PME–PLE 0.06, AME–PME 0.07, ALE–ALE 0.35, PLE–PLE 0.36, ALE– PLE contiguous. Length of legs: I 1.73 (0.46, 0.56, 0.41, 0.30), II 1.71 (0.47, 0.53, 0.42, 0.29), III 1.4 (0.37, 0.44, 0.34, 0.25), IV 1.71 (0.49, 0.52, 0.39, 0.31). TmI 0.36 and TmIV 0.29. Tibial spine formula: 2-2-2-2. Opisthosoma 0.85 long, 0.55 wide, oval, black, adorned with ridges and papillae.
Palp (Figs 184A–D): Femur unmodified, as long as patella, tibia and cymbium. Patella shorter than tibia, dorsally with long spine, mesally grooved. Tibia conic, with one reterolateral and one dorsal trichobothria, posterior margin broad in reterolateral view; cymbium small, oval, desely covered with spines; paracymbium (PC) robust, distal arm almost triangular, covers most part of the subtegulum and tegulum; protegulum absent; distal suprategular apophysis (DSA) longer than wide, sword-shaped, extends above the apex of cymbium. Embolic division: Radix (R) oval, proximal end with 3 disks, like projections stacking over one another. Terminal apophysis and median membrane absent. Embolus (E) long, filiform.
Female (one of the paratypes, Figs 186C, D): Total length: 1.76. Carapace 0.61 long, 0.62 wide, dark brown, round posteriorly, the ocular region narrows, with long thick setae. Clypeus 0.11 high. Chelicerae with two promarginal and four retromarginal teeth. Sternum shield-like, black with microsetae. Eyes: AER recurved, PER procurved. Eye sizes and interdistances: AME 0.07, ALE 0.07, PME 0.09, PLE 0.07, AME–AME 0.02, PME–PME 0.08, AME–ALE, 0.04, PME–PLE 0.03, AME–PME 0.07, ALE–ALE 0.33, PLE–PLE 0.36, ALE– PLE contiguous. Length of legs: I 2.22 (0.58, 0.68, 0.59, 0.37), II 2.14 (0.54, 0.69, 0.58, 0.33), III 1.83 (0.53, 0.56, 0.46, 0.28), IV 2.28 (0.67, 0.76, 0.52, 0.33). TmI 0.37 and TmIV 0.28. Tibial spine formula: 2-2-2-2. Opisthosoma 1.29 long, 0.88 wide, oval, brown, adorned with ridges and papillae.
Epigyne (Figs 185A–D): Ventral plate (VP) longer than wide, hook-shaped. The ventral and dorsal plates of epigyne completely separated from each other.Dorsal plate (DP) longer than wide, with a broad round scapoid (SCD) posteriorly; copulatory ducts (CD) form a longitudinal loop before entering the spermathecae. Spermathecae (S) globular, present dorso-laterally. Fertilization ducts (FD) small, extending mesally.
Distribution.Known from type localities (Chongqing and Hunan Province, Figs 307, 315).
description: Published as part of Irfan, Muhammad, Zhou, Gu-Chun, Peng, Xian-Jin & Zhang, Zhi-Sheng, 2025, Survey of Linyphiidae spiders (Arachnida: Araneae) from some Oriental Regions of China, pp. 1-248 in Megataxa 15 (1) on pages 142-146, DOI: 10.11646/megataxa.15.1.1, http://zenodo.org/record/14985176