Dicristatus cordatus 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 : 37-38

Dicristatus cordatus Irfan, Zhang & Peng , sp. n.

(òä二叉e)

Figures 43 , 44 , 312 , 315

Types. Holotype ♀ ( HNU–HB– IV–1718 ), CHINA, Hubei Prov.: Enshi Co., Huangjindong Town, Maliuxi Vill. , 29.95006°N, 109.02566°E, 876 m, 20.V.2017, G.C. Zhou et al. leg.; Paratypes: 4♀, with same data as for holotype ( HNU–HB– IV–1718 ); 6♀, 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♀, Enshi Co., Huangjindong Town, Maliuxi Village 29.95240°N, 109.01717°E, 785 m, 20.V.2017, G.C. Zhou et al. leg.; 1♀, Enshi Co., Xingdou MNNR , 30.04611°N, 109.13038°E, 1205 m, 18.V.2017, G.C. Zhou et al. leg. ( HNU–HB– IV–1712 ); 2♀, Enshi Co., Huangjindong Town, Maliuxi Vill. , 29.95948°N, 109.02106°E, 752 m, 24.VIII.2017, M. Irfan & G.C. Zhou leg. ( HNU–HB– IV–1724 ); 1♀, Enshi Co., Xingdou MNNR , 30.04166°N, 109.13377°E, 1253 m, 18.V.2017, G.C. Zhou et al. leg. ( HNU–HB– IV–1710 ); Hunan Prov.: 2♀, Ningxiang Co., Huaminglou Town, Yanglin Vill. , 28.10020°N, 112.65881°E, 189 m, 10.V.2017, G.C. Zhou et al. leg. ( HNU–HN– IV–1707 ) .

Etymology. The species name comes from the Latin adjective “cordatus ”, meaning “heart-shaped” and referring to the heart-shaped dorsal plate in epigyne.

Diagnosis. Dicristatus cordatus sp. n. resembles D. minutus in having the similar copulatory ducts extending posteriorly ( Figs 43A–D ; Irfan et al. 2023, figs 10A–E), but can be distinguished by the anterior margin of dorsal plate triangular in D. cordatus sp. n. ( Fig. 43D ; vs. pentagonal in D. minutus ).

Description. Female (holotype, Figs 44A, B ): Total length: 1.52. Carapace 0.664 long, 0.56 wide, yellowish with grey marking, mid dorsally slightly elevated, with fovea, cervical and radial grooves distinct. Clypeus 0.14 high. Chelicerae with five promarginal and six retromarginal teeth. Sternum longer than wide, yellowish, with microsetae. Eyes: AER recurved, PER straight, slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.06, PLE 0.07, AME–AME 0.02, PME–PME 0.03, AME–ALE, 0.02, PME–PLE 0.03, AME–PME 0.04, ALE–ALE 0.24, PLE–PLE 0.26, ALE–PLE contiguous. Length of legs: I 2.23 (0.56, 0.79, 0.51, 0.37), II 1.97 (0.54, 0.64, 0.45, 0.34), III 1.60 (0.51, 0.54, 0.38, 0.27), IV 2.16 (0.69, 0.77, 0.49, 0.31). Tibial spine formula: 2-2-1-1. TmI 0.27 and TmIV absent. Opisthosoma 1.07 long, 0.85 wide, oval, light yellowish, mid dorsally with broad black band, ventrally transverse black band around epigastric furrow.

Epigyne ( Figs 43A–D ): Protruding, ventral plate (VP) wider than long; dorsal plate (DP) heart–shaped, extending posteriorly above the epigastric furrow; copulatory opening (CO) present in ventral pocket of copulatory ducts; copulatory ducts (CD) extending posteriorly on the dorsal plate; spermathecae (S) globular, present anteriorly on dorsal plate, spaced by two-third of diameters.

Male. Unknown.

Distribution. Known only from the type localities (Hubei and Hunan Provinces, Figs 310 , 315 ).

Figures

FIGURE 43. Dicristatus cordatus sp. n., female holotype. 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 44. Dicristatus cordatus sp. n., female holotype. A Habitus, dorsal view; B Habitus, ventral view.

FIGURE 310. Distribution of Linyphiidae species in Guizhou Prov.: 1. Bathyphantes paracymbialis Tanasevitch, 2014; 2. Bifurcia ramosa (Li & Zhu, 1987); 3. Bolyphantes aculeatus sp. n.; 4. Bolyphantes arcuatus sp. n.; 5. Bolyphantes gladius sp. n.; 7. Dicristatus denticulatus sp. n.; 8. Diplocephalus tongrenensis sp. n.; 9. Diplocephaloides cucullus sp. n.; 10. Gonatium absidatum sp. n.; 11. Tapinocyba cornuta sp. n.; 12. Gongylidium demersum sp. n.; 13. Tapinocyba pingshanensis sp. n.; 14. Hylyphantes graminicola (Sundevall, 1830); 15. Nippononeta coreana (Paik, 1991); 16. Prosoponoides sinensis (Chen, 1991); 17. Ryojius fanjingshanensis sp. n.; 18. Ryojius fodingshanensis sp. n.; 19. Scotinotylus guizhouensis sp. n.; 20. Scotinotylus longiprojectus sp. n.; 21. Spelaeus cicatrix sp. n.; 6. Trematocephalus cristatus (Wider, 1834); 22. Walckenaeria asymmetrica Song & Li, 2011; 23. Walckenaeria xingdouensis sp. n..

FIGURE 312. Distribution of Linyphiidae species in Hubei Prov.: 2. Asiagone xingdouensis sp. n.; 3. Bathyphantes paracymbialis Tanasevitch, 2014; 4. Bifurcia cochlearis sp. n.; 5. Capsulia tianmushana (Chen & Song, 1987); 6. Dicristatus cordatus sp. n.; 7. Diplocephalus circularis sp. n.; 8. Erigone prominens Bösenberg & Strand, 1906; 9. Frontinella zhui Li & Song, 1993; 10. Gnathonarium dentatum (Wider, 1834); 11. Gongylidioides ensis sp. n.; 12. Gongylidioides microdontus sp. n.; 13. Gongylidium dawolongense sp. n.; 14. Gongylidium minutum sp. n.; 15. Gongylidium uncatum sp. n.; 16. Houshenzinus rimosus Tanasevitch, 2006; 17. Hylyphantes graminicola (Sundevall, 1830); 18. Indophantes wushanensis Irfan, Wang & Zhang, 2023; 1. Microneta maliuxiensis 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..