Vietnagone silvatica, Tanasevitch, 2019

Tanasevitch, Andrei V., 2019, A new genus and two new species of linyphiid spiders (Arachnida: Araneae) from Vietnam, Raffles Bulletin of Zoology 67, pp. 129-134 : 130

Vietnagone silvatica , new species

( Figs. 1–3 , 7–13 )

Holotype male ( MHNG), VIETNAM, Vinh Phuc Province, 1 km SE of Tam Dao, 21°26′49″N 105°39′06″E, 1,000– 1,200 m a.s.l., evergreen forest, 13–14 May 2012, coll. P. Schwendinger & A. Schulz [VN-12/03c].

Paratype: 1 female ( MHNG), collected together with the holotype.

Etymology. The specific epithet is a Latin adjective meaning “forest-dweller”.

Description. Male holotype. Total length 1.50. Carapace 0.73 long, 0.63 wide, unmodified, as shown in Fig. 1 , greyish pale brown. Eyes slightly enlarged. Chelicerae 0.28 long. Legs yellow. Leg I 3.01 long (0.83+0.20+0.73+0.70+0.55); IV 2.98 long (0.83+0.20+0.75+0.75+0.45). Chaetotaxy: 2.2.1.1. Length of spines 1.5–2 diameters of leg segment. All metatarsi with a trichobothrium. TmI 0.39. Palp ( Figs. 7–11 ): tibia with three apophyses: a retrolateral one wide and short, a dorsal apophysis long and narrow, a prolateral one fang-shaped. Distal part of paracymbium expanded, ending up with an uncus. Distal suprategular apophysis wide, relatively short. Median membrane strongly reduced. Convector divided into two parts: one elongated, slightly curved, with a hook-shaped distal apophysis, the other swollen and membraneous. Radix very small, embolus thin, relatively long, looped. Abdomen 0.80 long, 0.50 wide, dorsal pattern as in Fig. 1 .

Female. Total length 1.78. Carapace 0.78 long, 0.58 wide, unmodified, as shown in Fig. 2 . Chelicerae 0.35 long. Leg I 2.79 long (0.75+0.23+0.68+0.63+0.50); IV 2.84 long (0.78+0.23+0.70+0.68+0.45). Length of spines 1.5–2.5 diameters of leg segment. All metatarsi with a trichobothrium. TmI 0.44. Abdomen 1.13 long, 0.73 wide, dorsal pattern as in Fig. 2 . Epigyne ( Figs. 3 , 12, 13 ): cavity of epigyne totally covered with fused lateral walls. Copulatory ducts of complex shape, extended forwards. Receptacles small and rounded. Body ( Figs. 2, 3 ) and leg colouration, as well as chaetotaxy as in male.

Taxonomic remarks. See Remarks under Vietnagone rugulosa ( Song & Li, 2010) , new combination.

Distribution. So far known only from the type locality.

Figures

Figs. 1–6. Habitus of Vietnagone silvatica, new species (1–3) and Nasoonaria pseudoembolica, new species (4–6). 1, 4, male holotype; 2, 3, 5, 6, female paratype; 1, 2, 4, 5, dorsal view; 3, 6, ventral view.

Figs. 7–13. Details of palpal and epigynal structure of Vietnagone silvatica, new species. 7–10, male holotype; 12, 13, female paratype. 7, left palp, retrolateral view; 8, 9, palpal tibia, prolateral and dorsal views, respectively; 10, distal suprategular apophysis, lateral view; 11, embolic division; 12, 13, epigyne, ventral and dorsal views, respectively.