Oilinyphioides triangularis 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 : 142-146

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 ).

Figures

FIGURE 184. Oilinyphioides triangularis sp. n., male holotype. A Palp, prolateral view; B Palp, retrolateral view; C Palp, dorsal view; D Palp, ventral view. Abbreviations: DSA—distal suprategular apophysis; E—embolus; PC—paracymbium; ST— subtegulum.

FIGURE 185. Oilinyphioides triangularis sp. n., female paratype. A, C Epigyne, ventral view; B Epigyne, lateral view; D Vulva, dorsal view. Abbreviations: CD—copulatory duct; CO—copulatory opening; DP—dorsal plate; FD—fertilization duct; S—spermatheca; SCD—scapoid; VP—ventral plate.

FIGURE 186. Oilinyphioides triangularis sp. n., male holotype (A, B) and female paratype (C, D). A, C Habitus, dorsal view; B, D Habitus, ventral view.

FIGURE 307. Distribution of Linyphiidae species in Chongqing: 1. Bathyphantes paracymbialis Tanasevitch, 2014; 2. Diplocephalus circularis sp. n.; 3. Frontinella zhui Li & Song, 1993; 4. Gnathonarium dentatum (Wider, 1834); 5. Gongylidioides acuminatus sp. n.; 6. Gongylidioides ensis sp. n.; 7. Gongylidium uncatum sp. n.; 8. Himalaphantes azumiensis (Oi, 1979); 9. Hylyphantes graminicola (Sundevall, 1830); 10. Indophantes wushanensis Irfan, Wang & Zhang, 2023; 11. Lepthyphantes frondeus sp. n.; 12. Wulinggone qizimeiensis sp. n.; 13. Nematogmus ligulatus sp. n.; 14. Nematogmus sanguinolentus (Walckenaer, 1841); 15. Nippononeta alpina (Li & Zhu, 1993); 16. Nippononeta coreana (Paik, 1991); 17. Oia yinae sp. n.; 18. Oilinyphia xinqiaoensis sp. n.; 19. Oilinyphioides triangularis sp. n.; 20. Prosoponoides sinensis (Chen, 1991); 21. Scotinotylus guizhouensis sp. n.; 22. Sinolinyphia henanensis (Hu, Wang & Wang, 1991); 23. Syedra yuelushanensis sp. n.; 24. Ummeliata feminea (Bösenberg & Strand, 1906); 25. Ummeliata insecticeps (Bösenberg & Strand, 1906); 26. Walckenaeria sinuosa sp. n.; 27. Wuliphantes tongluensis (Chen & Song, 1988).

FIGURE 315. Distribution of Linyphiidae species in Hunan Prov.: 1. Acanoides cornutus sp. n.; 2. Acanoides ningxiangensis sp. n.; 4. Auriculaiana yongshunensis sp. n.; 5. Baryphyma xiaoxiense sp. n.; 6. Bathyphantes paracymbialis Tanasevitch, 2014; 7. Bathyphantes pseudogracilis sp. n.; 8. Bifurcia ramosa (Li & Zhu, 1987); 9. Bolyphantes arcuatus sp. n; 10. Bolyphantes gladius sp. n.; 11. Capsulia tianmushana (Chen & Song, 1987); 12. Dicristatus cordatus sp. n.; 13. Diplocephalus circularis sp. n.; 14. Drapetisca boletus sp. n.; 15. Drapetisca nanpingensis sp. n.; 16. Drapetisca yuelushanensis sp. n.; 17. Erigone prominens Bösenberg & Strand, 1906; 18. Frontinella zhui Li & Song, 1993; 19. Gnathonarium dentatum (Wider, 1834); 20. Gnathonarium gibberum Oi, 1960; 21. Oedothorax fortis sp. n.; 22. Tapinocyba sulcata sp. n.; 23. Himalaphantes azumiensis (Oi, 1979); 24. Hylyphantes graminicola (Sundevall, 1830); 25. Kaestneria bicultrata Chen & Yin, 2000; 26. Lepthyphantes frondeus sp. n.; 27. Microlinyphia zhejiangensis (Chen, 1991); 3. Microneta acutalis sp. n.; 28. Nematogmus sanguinolentus (Walckenaer, 1841); 29. Nippononeta alpina (Li & Zhu, 1993); 30. Nippononeta coreana (Paik, 1991); 31. Oia baiyunensis sp. n.; 32. Oia lata sp. n.; 33. Oia yinae sp. n.; 34. Oilinyphioides triangularis sp. n.; 35. Paikiniana lurida (Seo, 1991); 36. Parameioneta bilobata Li & Zhu, 1993; 37. Prosoponoides sinensis (Chen, 1991); 38. Ryojius lianghekouensis sp. n.; 39. Ryojius nanyuensis (Chen & Yin, 2000); 40. Scotinotylus longiprojectus sp. n.; 41. Shaanxinus insectus sp. n.; 42. Shaanxinus longiembolus sp. n.; 43. Sinolinyphia henanensis (Hu, Wang & Wang, 1991); 44. Syedra yuelushanensis sp. n.; 45. Tenuiphantes taipingensis sp. n.; 46. Ummeliata feminea (Bösenberg & Strand, 1906); 47. Ummeliata insecticeps (Bösenberg & Strand, 1906); 48. Walckenaeria xingdouensis sp. n.; 49. Walckenaeria extenuata sp. n.; 50. Walckenaeria yanglinensis sp. n.; 51. Wuliphantes tongluensis (Chen & Song, 1988); 52. Yuelushannus diaotangensis sp. n.; 53. Yuelushannus jinyuanensis sp. n.; 54. Yuelushannus wenfengensis sp. n..