Diplocephalus tongrenensis 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 : 46

Diplocephalus tongrenensis Irfan, Zhang & Peng , sp. n.

(AEṯ双头e)

Figures 58 , 59 , 310

Types. Holotype ♀ ( HNU-GZ-IV-1804 ), CHINA, Guizhou Prov.: Tongren City, Shiqian Co., Pingshan Township , Fodingshan Vill ., Fodingshan NNR , 27.332781°N, 108.151789°E, 617m. 03.V.2018, D. Li et al. leg. Paratypes: 2♀, same data as female holotype ( HNU-GZ-IV-1804 ).

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

Diagnosis. Diplocephalus tongrenensis sp. n. resembles D. hispidulus in having the epigyne ventral plate with a slit at the middle and copulatory opening present anteriorly ( Figs 58A–C ; Saito & Ono 2001, figs 90, 91), but can be distinguished by the spermathecae present anteriorly in D. tongrenensis sp. n. ( Figs 58A–C ; vs. present posteriorly).

Description. Female (holotype, Figs 59A, B ): Total length: 2.45. Carapace 0.99 long, 0.81 wide, cephalic region slightly elevated, orange, cervical and radial grooves distinct. Clypeus 0.29 high. Chelicerae with four promarginal and four retromarginal teeth. Sternum as long as wide, orange, with microsetae. Eyes: AER recurved, PER procurved. Eye sizes and interdistances: AME 0.04, ALE 0.08, PME 0.07, PLE 0.6, AME–AME 0.04, PME–PME 0.05, AME–ALE, 0.03, PME–PLE 0.05, AME–PME 0.06, ALE–ALE 0.31, PLE–PLE 0.34, ALE–PLE contiguous. Length of legs: I 3.69 (1.03, 1.23, 0.88, 0.55), II 3.54 (1.01, 1.16, 0.83, 0.54), III 2.83 (0.87, 0.89, 0.66, 0.41), IV 3.61 (1.07, 1.16, 0.87, 0.51). Tibial spine formula: 2-2-1-1. TmI 0.24 and TmIV absent. Opisthosoma 1.71 long, 1.27 wide, oval, pale, dorsally with two pairs of sigillae, ventally with one pair of yellow spots near spinnerets posteriorly.

Epigyne ( Figs 58A–C ): Epigynal plate one and half times wider than long, fissure wide, ventral plate (VP) wider than long, inner margin arc-shaped; dorsal plate (DP) partially covered by the ventral plate, spindle-shaped in ventral view and somewhat rectangular posteriorly. Copulatory ducts (CD) enclosed in a slightly sclerotized capsule; copulatory openings (CO) present at the anterior end of the ventral plate. Spermathecae (S) round, most of it covered by copulatory ducts, pointing dorso-laterally. Fertilization ducts (FD) extending mesally.

Male. Unknown.

Distribution. Known only from the type locality (Guizhou Province, Fig. 310 ).

Comment: The epigynal fissure of D. tongrenensis sp. n. is wide and quite different from those in all other congeners. The species is provisionally placed in the genus Diplocephalus .

Figures

FIGURE 58. Diplocephalus tongrenensis 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 59. Diplocephalus tongrenensis 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..