Ryojius lianghekouens i s Irfan, Zhang & Peng, 2025

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 : 155-157

Ryojius lianghekouens i s Irfan, Zhang & Peng , sp. n.

(两Ŝ口ƋĀe)

Figures 204 , 205 , 313 , 315

Types. Holotype ♀ ( HNU–HN– IV–1718 ), CHINA, Hunan Prov.: Ningxiang Co., Huaminglou Town, Tanzi Vill. , 28.032005°N, 112.640872°E, 72 m, 09.V.2017, G.C. Zhou et al. leg. Paratypes: 1♀, Hengyang City, Nanyue District, Hengshan NNR , Guanjing Villa , 27.290263°N, 112.70072°E, 1186 m, 19.I.2018, G.C. Zhou et al. leg. ( HNU–HNHS–18–10 ); 1♀, Hengyang City, Nanyue District, Hengshan NNR , Hu Heyun Tomb , 27.26710°N, 112.71825°E, 389 m, 19.I.2018, G.C. Zhou et al. leg. ( HNU–HNHS–18–12 ); Hubei Prov.: 3♀, Enshi Co., Xuaneng, Changtanghe Town , Lianghekou Vill. , 29.99053°N, 109.73879°E, 965 m, 13.V.2017, G.C. Zhou et al. leg. ( HNU–HB– IV–1701 ); 1♀, Enshi Co., Xuaneng, Changtanghe Town , Lianghekou Vill. , 30.00166°N, 109.74093°E, 1234 m, 14.V.2017, G.C. Zhou et al. leg. ( HNU–HB– IV–1703 ); 2♀, Enshi Co., Huangjindong Town, Maliuxi Vill. , 30.03902°N, 109.14274°E, 1114 m, 19.V.2017, M. Irfan & G.C. Zhou leg. ( HNU–HB– IV–1715 ); 1♀, Xuanen Co., Shadaogou Town, Qizimei Mountain , 29.706342°N, 109.75642°E, 1155 m, 30.IV.2016, W. Liu et al. leg.

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

Diagnosis. The female of Ryojius lianghekouens i s sp. n. resembles that of R. nanyuensis in having the similar longer than wide dorsal part of scape, the stretcher and the posterior median plate of epigyne ( Figs 204A–D ; Figs 207A–D ; Tu, Saaristo & Li, 2006 fig. 18), but can be distinguished by the posterior margin of basal part of scape V-shaped in R. lianghekouens i s sp. n. ( Figs 204A– D ; vs. arch-shaped).

Description. Female (holotype, Figs 207A, B ): Total length: 1.62. Carapace 0.75 long, 0.57 wide, light brown, cervical and radial grooves distinct Clypeus 0.28 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wide, yellowish grey with microsetae. Eyes: AER recurved, PER straight, slightly wider. Eye sizes and interdistances:AME 0.04, ALE 0.05, PME 0.05, PLE 0.06, AME–AME 0.01, PME–PME 0.04, AME–ALE, 0.03, PME–PLE 0.04, AME–PME 0.04, ALE–ALE 0.22, PLE–PLE 0.26, ALE–PLE contiguous. Length of legs: I 1.95 (0.58, 0.66, 0.37, 0.34), II 1.78 (0.54, 0.62, 0.36, 0.26), III 1.59 (0.47, 0.48, 0.33, 0.31), IV 1.97 (0.59, 0.68, 0.41, 0.29). TmI 0.32 and TmIV absent. Tibial spine formula: 2-2-2-2. Opisthosoma 1.04 long, 0.68 wide, oval, pale, posteriorly with two black chevrons; ventral side pale with black patches.

Epigyne ( Figs 204A–D ): Potruding; characterised by conspicuosly wide, posteriorly projecting scape, posterior end of basal part of scape (BS) V-shaped, dorsally bearing narrow tongue-shaped stretcher (ST). Distal part of scape (DPS) longer than wide with small lateral pockects (LP). Posterior median plate (PMP) rectangular. spermathecae (S) globular, situates at the apeces.

Male. Unknown.

Distribution. Known from type localities (Hubei and Hunan Provinces, Figs 313 , 315 ).

Figures

FIGURE 204. Ryojius lianghekouensis sp. n., female holotype. A, C Epigyne, ventral view; B Epigyne, lateral view; D Vulva, dorsal view.Abbreviations: BS—basal part of scape; DPS—distal part of scape; EG—entrance groove; LP—lateral pocket; PMP— posterior median plate; S—spermatheca; ST—stretcher.

FIGURE 205. Ryojius lianghekouensis sp. n., female holotype. A Habitus, dorsal view; B Habitus, ventral view.

FIGURE 207. Ryojius nanyuensis (Chen & Yin, 2000), female. A, C Epigyne, ventral view; B Epigyne, lateral view; D Vulva, dorsal view.Abbreviations: BS—basal part of scape; DPS—distal part of scape; EG—entrance groove; LP—lateral pocket; PMP— posterior median plate; S—spermatheca; ST—stretcher.

FIGURE 313. Distribution of Linyphiidae species in Hubei Prov.: 19. Lepthyphantes ellipticus sp. n.; 20. Lepthyphantes frondeus sp. n.; 21. Linyphia songziyuanensis sp. n.; 22. Lenis longiabdominis sp. n.; 23. Wulinggone qizimeiensis sp. n.; 24. Nematogmus ligulatus sp. n.; 25. Nematogmus sanguinolentus (Walckenaer, 1841); 26. Nippononeta coreana (Paik, 1991); 27. Oedothorax collinus Ma & Zhu, 1991; 28. Paikiniana lurida (Seo, 1991); 29. Parameioneta bilobata Li & Zhu, 1993; 30. Wulingnus furcatus sp. n.; 31. Wulingnus inversus sp. n.; 32. Platyspira tanasevitchi Song & Li, 2009; 33. Prosoponoides sinensis (Chen, 1991); 34. Ryojius lianghekouensis sp. n.

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..