Gongylidium demersum Irfan, Zhang & Peng

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

(Sê圆ae)

Figures 96 View FIGURE 96 , 97 View FIGURE 97 , 310 View FIGURE 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. GoogleMaps Paratype: 1♀, With same data as for holotype female ( HNU–GZ– IV–1706 ). GoogleMaps

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

Description. Female ( Figs 97A, B View FIGURE 97 ): 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 View FIGURE 96 ):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 View FIGURE 310 ).