Dicymbium sinofacetum, Tanasevitch, Andrei V., 2006

Tanasevitch, Andrei V., 2006, On some Linyphiidae of China, mainly from Taibai Shan, Qinling Mountains, Shaanxi Province (Arachnida: Araneae), Zootaxa 1325, pp. 277-311 : 289-292

Dicymbium sinofacetum sp. n.

Figs 39–44

? Araeoncus stigmosus Xia et al. 2001: 164 (female only!).

Material. Holotype ♂ ( SMF), China, Qinghai Prov., Bei Shan National Park, 120 km NE Xining, 2300–2700 m, 23.V.–8.VI.1996, leg. J. Martens. Paratypes: 1 ♂, 5 Ψ ( SMF), 2 Ψ ( ZMMU), together with holotype; 2 Ψ ( SMF), China, Shaanxi Prov., S flanks of Taibai Shan, above Houshenzi, primary broadleaved forest, 2500–2600 m, 25.–26.VI.1997, leg. J. Martens & P. Jäger.

Diagnosis. The species is very closely related to the Siberian D. facetum (L. Koch 1879) , but differs by the non­expanded proximal part of the paracymbium, by the presence of a deep hollow at the base of the embolus, which is shorter than in D. facetum , as well as by the shape of the receptacula of the vulva. Like D. facetum , D. sinofacetum sp. n. has no trichobothrium on Mt IV.

Araeoncus stigmosus Xia, Zhang, Gao, Fei, Rui & Kim 2001 was described from Gansu Province, China from both sexes ( Xia et al. 2001). According to the published figures, the female of this species belongs to the genus Dicymbium Menge 1868 , not Tibioploides Eskov & Marusik 1991 , and is probably referred to D. sinofacetum sp. n.

NB: The female of D. facetum has not yet been described.

Etymology. The species name sinofacetum is a combination of Latin “Sinae” and “ facetum ”, emphasizing that the new Chinese species is closely related to Dicymbium facetum (L. Koch 1879) ; adjective.

Description. Male. Total length––2.00. Carapace 0.83 long, 0.75 wide, unmodified, reddish brown. Chelicerae 0.30 long. Legs yellow­red. Leg I, 2.89 long (0.83+0.25+0.68+0.65+0.48), IV––3.09 long (0.88+0.25+0.83+0.70+0.43). Chaetotaxy 2.2.1.1, spines on tibiae I–III very small, on tibia IV almost equal to diameter of the segment. Mt IV lacking a trichobothrium. TmI––0.40. Palp ( Figs 39–41 ). Palpal tibia before bifurcation with a small, almost transparent tooth. Suprategular apophysis long, divided into two club­like branches distally. Radix with a long, pointed, anterior outgrowth. Opisthosoma 1.15 long, 0.80 wide, grey to dark grey.

Female. Total length––2.33. Carapace 0.88 long, 0.70 wide. Chelicerae 0.35 long. Leg I, 2.84 long (0.75+0.25+0.78+0.63+0.43), IV––3.01 long (0.88+0.20+0.80+0.68+0.45). TmI––0.49. Opisthosoma 1.63 long, 1.05 wide. Epigyne as in Figs 42–44 . Body and leg colouration, chaetotaxy as in male.

Figures

FIGURES 39 – 44. Dicymbium sinofacetum sp. n., paratypes. 39 right palp (retrolateral view), 40 palpal tibia (dorsal view), 41 distal part of palp (prolateral view), 42 epigyne (ventral view), 43, 44 vulva (43 ventral view, 44 dorsal view). Abbreviations: E embolus, RA radical apophysis, SA suprategular apophysis.