Shaanxinus ovatus 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 : 169-172

Shaanxinus ovatus Irfan, Zhang & Peng , sp. n.

(Ɓ圆ọe)

Figures 222–225 , 315

Types. Holotype ♂, CHINA, Hunan: Mangshan NNR , 24.9517333°N, 112.9500167°E, 1294 m, 13.VIII.2014, H.Q. Yin et al. leg. Paratypes: 2♂ 11♀, with same data as for holotype.

Etymology. The specific epithet is derived from the Latin adjective “ovatus ” meaning “oval” and referring to the oval form of dorsal plate in epigyne.

Diagnosis. The male of Shaanxinus ovatus sp. n. resembles that of S. rufus in having the similar paracymbium ( Figs 222A–D , 223A–C ; Lin et al. 2019, figs 7A–C, Tanasevitch 2006, figs 51–58), but can be distinguished by the distal suprategular apophysis distal somewhat triangular with blunt end in S. ovatus sp. n. ( Figs 222A–C ; vs. flat, membranous apically); anteriao radial process somewhat quadrate in S. ovatus sp. n. ( Figs 222A–C ; vs. triangular). The female resembles those of S. ovatus sp. n. in having the similar copulatory ducts ( Figs 224A–C , 220A–C ), but can be distinguished by the copulatory ducts not extending on dorsal plate in S. ovatus sp. n. ( Figs 224A–C ; vs. posteriorly extending above the dorsal plate in S. longiembolus sp. n.).

Description. Male (holotype, Figs 225A–C ): Total length: 2.28. Carapace 0.99 long, 0.77 wide, brown, cephalic region strongly elevated 0.39 high; ocular region protruding forward with thick setae; fovea, cervical and radial grooves distinct. Clypeus 0.41 high. Chelicerae with four promarginal and five retromarginal teeth. Sternum longer than wide, brownish grey with microsetae. Eyes: AER straight, PER procurved. Eye sizes and interdistances: AME 0.04, ALE 0.06, PME 0.05, PLE 0.05, AME–AME 0.06, PME–PME 0.05, AME–ALE, 0.03, PME–PLE 0.05, AME–PME 0.08, ALE–ALE 0.25, PLE–PLE 0.27, ALE–PLE contiguous. Length of legs: I 4.02 (1.12, 1.29, 1.03, 0.58), II 3.95 (1.11, 1.29, 1.01, 0.54), III 2.99 (0.93, 0.88, 0.80, 0.38), IV 3.54 (1, 1.13, 0.89, 0.52). Tibial spine formula: 2-2-2- 2. TmI 0.83 and TmIV present. Opisthosoma 1.29 long, 0.75 wide, oval, blackish grey with irregular light grey patches.

Palp ( Figs 222A–D , 223A–C ): Femur unmodified, almost longer than patella and tibia. Patella shorter than tibia, mesally slightly curved. Tibia with two reterolateral and one dorsal trichobothria and posterior margin with long thick spines, prolateral tibial apophysis (PTA) slightly curved with blunt end; cymbium unmodified, retrolateral margin membranous, with a shallow depression at the base, broad at distal end; paracymbium (PC) U-shaped, lower margin of distal arm wave-like in ventral view; tegulum (T) possess small protegulum (PT); distal suprategular apophysis (DSA) sclerotized, with pointed end. Embolic division: Radix (R) somewhat triangular; anterior radical process (ARP) sclerotized with pointed end protruding upward; anterior radical scaly (ARS) part wider than long, retained below both of the anterior radical process and cymbium; lateral extension of radix (LER) thumb-shaped, slightly curved, covering terminal part of embolus; tailpiece (TP) relatively sharp with pointed tip; embolic membrane absent; embolus (E) sclerotized, arch-shaped, terminal part ends in anterior radical process.

Female (one of the paratypes, Figs 225D–F ): Total length: 2.48. Carapace 1.22 long, 0.90 wide, brown, cephalic region slightly elevated; fovea, cervical and radial grooves distinct. Clypeus 0.27 high. Chelicerae with four promarginal and five retromarginal teeth. Sternum longer than wide, dark brownish grey with microsetae. Eyes: AER recurved, PER straight, slightly wider. Eye sizes and interdistances: AME 0.06, ALE 0.07, PME 0.06, PLE 0.07, AME–AME 0.03, PME–PME 0.08, AME–ALE, 0.03, PME–PLE 0.05, AME–PME 0.05, ALE–ALE 0.31, PLE–PLE 0.35, ALE–PLE contiguous. Length of legs: I 4.55 (1.31, 1.50, 1.13, 0.61), II 4.43 (1.28, 1.48, 1.14, 0.53), III 3.16 (0.94, 0.97, 0.81, 0.44), IV 4.09 (1.19, 1.24, 1.12, 0.54). Tibial spine formula: 2-2-2-2. TmI 0.83 and TmIV present. Opisthosoma 1.43 long, 0.86 wide, pale, with longitudinal green bands followed by three chevrons, broad black patch at the base of spinnerets; ventral side with broad green patches.

Epigyne ( Figs 224A–C ): Ventral plate (VP) wider than long, covered with thick spines; dorsal plate (DP) oval, completely visible in ventral view. Copulatory openings (CO) present mid–ventrally at the junction of the dorsal and ventral plates; copulatory ducts (CD) with broad oval loop mid ventrally. Spermathecae (S) globular, present dorso-laterally, spaced by two and half diameters; fertilization ducts (FD) large, extending mesally.

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

Figures

FIGURE 220. Shaanxinus longiembolus sp. n., female paratype. A, B Epigyne, ventral view; C Vulva, dorsal view.Abbreviations: CD—copulatory duct; CO—copulatory opening; DP—dorsal plate; FD—fertilization duct; S—spermatheca; VP—ventral plate.

FIGURE 222. Shaanxinus ovatus sp. n., male holotype. A Palp, prolateral view; B Palp, retrolateral view; C Palp, dorsal view; D Palp, ventral view. Abbreviations: ARP—anterior radical process; ARS—anterior radical scaly part; DSA—distal suprategular apophysis; E—embolus; LER—lateral extension of radix; PC—paracymbium; PT—protegulum; R—radix; ST—subtegulum; T—tegulum; TP—tailpiece.

FIGURE 223. Shaanxinus ovatus sp. n., male paratype palp. A, C Embolic division, ventral view; B Embolic division, dorsal view. Abbreviations: ARP—anterior radical process; ARS—anterior radical scaly part; E—embolus; LER—lateral extension of radix; R—radix; TP—tailpiece.

FIGURE 224. Shaanxinus ovatus sp. n., female paratype. A, B Epigyne, ventral view; C Vulva, dorsal view. Abbreviations: CD—copulatory duct; CO—copulatory opening; DP—dorsal plate; FD—fertilization duct; S—spermatheca; VP—ventral plate.

FIGURE 225. Shaanxinus ovatus sp. n., male holotype (A–C) and female paratype (D–F). A, D Habitus, dorsal view; B, E Habitus, lateral view; C, F 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..