Oia baiyunensis 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 : 128-130

Oia baiyunensis Irfan, Zhang & Peng , sp. n.

(Ɵ云伊亚e)

Figures 169–171 , 315

Types. Holotype ♂ ( HNU–HN– IV–1715 ), CHINA, Hunan Prov.: Xiangxi, Baojing Co., Maogou Town , Baiping Vill ., Baiyun MNNR , 28.61789°N, 109.40585°E, 298 m, G.C. Zhou et al. leg. Paratypes: 1♀, with same data as for holotype ( HNU–HN– IV–1715 ).

Etymology. The specific epithet is derived from the type locality; adjective.

Diagnosis. Oia baiyunensis sp. n. resembles O. imadatei in having similar thick, robust spine in male palp and ventral plate in epigyne in female ( Figs 169A– D , 170A–D ; Lv et al. 2015, figs 2A–E), but can be distinguished by the dorsal tibial apophysis short with broad distal end in O. baiyunensis sp. n. ( Figs 169A–C ; vs. two times longer than tibial apophysis of O. baiyunensis sp. n.); distal end of embolus relatively thick in O. baiyunensis sp. n. ( Figs 169A, D ; vs. filiform); copulatory openings present mid ventrally lower to anterior margin of epigynal plate in O. baiyunensis sp. n. ( Figs 170A–D ; vs. present mid ventrally at the anterior margin of epigynal plate); spermathecae kidney-shaped in O. baiyunensis sp. n. ( Figs 170A–D ; vs. round).

Description. Male (holotype, Figs 171A, B ): Total length: 1.38. Carapace 0.61 long, 0.45 wide, yellow, cephalic region elevated, ocular quad triangular, mid dorsally with three setae, cervical and radial grooves distinct. Clypeus 0.16 high. Chelicerae with five promarginal and five retromarginal teeth. Sternum longer than wider, yellowish grey with microsetae. Eyes: AER recurved, PER slightly recurved, wider than AER. Eye sizes and interdistances:AME 0.02, ALE 0.04, PME 0.03, PLE 0.04, AME–AME 0.01, PME–PME 0.01, AME– ALE, 0.01, PME–PLE 0.01, AME–PME 0.04, ALE–ALE 0.12, PLE–PLE 0.14, ALE–PLE contiguous. Length of legs: I 1.44 (0.44, 0.50, 0.24, 0.26), II 1.31 (0.39, 0.44, 0.23, 0.25), III 1.11 (0.34, 0.36, 0.20, 0.21), IV 1.43 (0.45, 0.49, 0.26, 0.23). TmI present and TmIV absent. Tibial spine formula: 1-1-1-1. Opisthosoma 0.77 long, 0.46 wide, oval, yellow.

Palp ( Figs 169A–D ): Femur unmodified, as long as both patella and tibia. Patella one and half times longer than tibia. Tibia mid dorsally with a thick, robust spine, with one retrolateral trichobothria, dorsal tibial apophysis (DTA) sclerotized, with beak-shaped in prolateral view with pointed end; cymbium unmodified, globular in ventral view; paracymbium (PC) C-shaped; distal suprategular apophysis (DSA) robust, proximally with small tooth. Median membrane (MM) arises from the ventral side of the radix, broad, oval, extending upward; embolus (E) long, thick, sclerotized, arises at 6 o’clock, slightly extending above the cymbium.

Female (one of paratype, Figs 171C, D ): Total length: 1.23.Carapace0.58long,0.42wide, yellow,cephalicregion elevated, ocular quad triangular, mid dorsally three setae, cervical and radial grooves distinct. Clypeus 0.16 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wider, yellowish grey with microsetae. Eyes: AER recurved, PER procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.02, ALE 0.04, PME 0.03, PLE 0.04, AME–AME 0.02, PME– PME 0.01, AME–ALE, 0.01, PME–PLE 0.01, AME– PME 0.04, ALE–ALE 0.15, PLE–PLE 0.17, ALE–PLE contiguous. Length of legs: I 1.22 (0.38, 0.41, 0.21, 0.22), II 1.16 (0.37, 0.39, 0.20, 0.20), III 0.95 (0.31, 0.28, 0.18, 0.18), IV 1.19 (0.37, 0.40, 0.21, 0.21). TmI present and TmIV absent. Tibial spine formula: 1-1-1-1. Opisthosoma 0.76 long, 0.43 wide, oval, yellow.

Epigyne ( Figs 170A–D ): Ventral plate (VP) longer than wide, posterior end round; copulatory opening (CO) present anteriorly on ventral plate; copulatory ducts (CD) long, sinuous; spermathecae (S) present dorso-laterally at the anterior end of epigyne; fertilization ducts (FD) small, extending mesally.

Distribution. Known only from the type locality (Hunan Province, Fig. 315 ).

Figures

FIGURE 169. Oia baiyunensis 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; DTA—dorsal tibial apophysis; E—embolus; MM— median membrane; PC—paracymbium; SPT—suprategulum; ST—subtegulum; T—tegulum.

FIGURE 170. Oia baiyunensis sp. n., female paratype. A, B Epigyne, ventral view; C, D Vulva, dorsal view. Abbreviations: CD—copulatory duct; CO—copulatory opening; DP—dorsal plate; FD—fertilization duct; S—spermatheca; VP—ventral plate.

FIGURE 171. Oia baiyunensis sp. n., male holotype (A, B) and female paratype (C, D). A, C Habitus, dorsal view; B, D Habitus, ventral view.

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..