Gongylidium demersum Irfan, Zhang & Peng, sp. n.

(Sê圆ae)

Figures 96, 97, 310

Types. Holotype ♀ (HNU–GZ– IV–1706), CHINA, Guizhou Prov.: Tongren City, Shiqian Co., Pingshan Town, Fodingshan Vill., Fodingshan NNR, 27.34899°N, 108.16272°E, 666 m, 01.XI.2017, G.C. Zhou leg. Paratype: 1♀, With same data as for holotype female (HNU–GZ– IV–1706).

Etymology. The specific epithet is derived from the Latin adjective "demersus" meaning "depressed" referring to the slightly depressed posterior margin of dorsal plate in epigyne.

Diagnosis. Gongylidium demersum sp. n. resembles G. minutum sp. n. in having the similar dorsal plate (Figs 96A–C; Figs 98A–C), and can be distinguished by the ventral plate without any hood in G. demersum sp. n. (Figs 96A, B), vs. hood present in G. minutum sp. n. (Figs 98A, B); copulatory ducts short, not forming loop before entering the spermathecae in G. demersum sp. n. (Fig. 96C), vs. sinuous, forming long loop before entering the spermathecae in G. minutum sp. n. (Figs 98B, C).

Description. Female (Figs 97A, B): Total length: 2.06. Carapace 0.93long, 0.67 wide, cephalic region slightly elevated, pale, mid dorsally with macrosetae, cervical and radial grooves distinct. Clypeus 0.19 high. Chelicerae with five promarginal and five retromarginal teeth. Sternum longer than wide, light greenish with grey patches and microsetae. Eyes: AER recurved, PER procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.04, PME 0.05, PLE 0.05, AME–AME 0.01, PME–PME 0.02, AME–ALE, 0.04, PME–PLE 0.04, AME–PME 0.04, ALE–ALE 0.22, PLE–PLE 0.23, ALE–PLE contiguous. Length of legs: I 2.17 (0.65, 0.75, 0.41, 0.36), II 1.92 (0.61, 0.60, 0.37, 0.34), III 1.67 (0.54, 0.52, 0.32, 0.29), IV 2.17 (0.65, 0.79, 0.41, 0.32). TmI 0.27 and TmIV 0.16. Tibial spine formula: 2-2-1-1. Opisthosoma 1.15 long, 0.64 wide, oval, pale, densely covered with fine macrosetae.

Epigyne (Figs 96A–C):Ventral plate (VP) sclerotized, wider than long; dorsal plate (DP) rectangular, posterior margin slightly concave; copulatory opening (CO) present at the junction of dorsal and ventral plate; copulatory ducts (CO) short; spermathecae (S) elliptical, present at the apex of dorsal plate anteriorly; fertilization ducts (FD) extending mesally.

Male. Unknown.

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