Oreonetides taiwanus, Tanasevitch, Andrei V., 2011

Tanasevitch, Andrei V., 2011, On some linyphiid spiders from Taiwan (Araneae: Linyphiidae), Zootaxa 3114, pp. 31-39 : 34-36

Oreonetides taiwanus new species

Figs 9, 10 , 15–21

Type material: Holotype: 3, Taiwan (R.O.C.): Yilan County, Da Tong Township, Ming Ch’ih (= Mingchih), Road no 7, km 67, 1000 m a.s.l., tree-hole, 22.II.2010, leg. S. Vit [TAIW-10/4].

Etymology. The species name emphasizes the island of origin; adjective.

Diagnosis. O. taiwanus n. sp. differs well from other congeners by the chaetotaxy being 2.2.1.1, contra 2.2.2.2 or 2.2.2.1, as well as by the shape of the lamella characteristica and embolus.

Description. Male: Total length 2.03. Carapace 1.00 long, 0.78 wide, pale brown, unmodified. Chelicerae 0.40 long, unmodified, frontal tooth absent. Legs pale brown. Leg I, 2.58 long (0.70+0.25+0.70+0.55+0.38), IV, 2.42 long (0.68+0.23+0.65+0.53+0.33). Chaetotaxy 2.2.1.1, prolateral spine absent; length of spines about 1–1.5 diameters of segment. TmI, 0.33. Metatarsi IV without trichobothrium. Palp ( Figs 9, 10 , 15–21 ): Tibia with two apical outgrowths: one claw-shaped and a second one as an elongated inclined process with a narrow base and an expanded distal part. Paracymbium U-shaped, posterior pocket forming a tooth-like ridge. Pit hook claw-shaped, distal suprategular apophysis like an asymmetric pole axe with a very long and low lobe. Embolic division highly sclerotized, radix V-shaped, Fickert’s gland absent. Lamella characteristica as a long, narrow, bifid band. Terminal apophysis wide, with two spear-shaped processes terminally. Embolus large and curved, with a narrow base, broadened distally; serrate surface distinct; thumb large, well-sclerotized. Opisthosoma 1.00 long, 0.70 wide, grey.

Female: unknown.

Taxonomic remarks. O. taiwanus n. sp. is the first species in Oreonetides Strand, 1901 showing with a chaetotaxy formula as 2.2.1.1, while the other congeners have 2.2.2.2 or 2.2.2.1, sometimes with an additional prolateral spine on tibia I. Despite the differences in chaetotaxy, as well as in the absence of the female, the new species fits well to be assigned to Oreonetides , according to its palpal conformation, notably by the claw-shaped distal suprategular apophysis, V-shaped radix, as well as by the complex structure of the embolus.

Distribution. Known from the type locality only (see Fig. 29 ).

Figures

FIGURE 29. Collecting localities in Taiwan. Cross –– Gongylidioides diellipticus Song & Li, 2008; Square –– Maculoncus orientalis n. sp.; triangle –– Micrargus herbigradus (Blackwall, 1854) & Oia imadatei (Oi, 1964); circle –– Oreonetides taiwanus n. sp. and Tapinocyba formosa n. sp.; s tar –– Solenysa longqiensis Li & Song, 1992.

FIGURES 7 – 14. Micrargus herbigradus (Blackwall, 1854) (7, 8), Oreonetides taiwanus n. sp. (paratype) (9, 10) and Tapinocyba formosa n. sp. (paratype) (11 – 14). 7, 8 –– right palp (retrolateral and prolateral, respectively); 9 –– embolus; 10 –– suprategulum and distal suprategular apophysis; 11, 12 –– male carapace (lateral and dorsal, respectively); 13 –– epigynum (ventral view); 14 –– vulva (dorsal). Abbreviations used: D –– sperm duct; EP –– embolus proper; MM –– median membrane; PH –pit hook; SS –– serrate surface; Th –– thumb. Not to scale.

FIGURES 15 – 21. Palp details of Oreonetides taiwanus n. sp. (paratype). 15 –– right palp (retrolateral); 16, 17 –– palpal tibia (dorsal, different aspects); 18 –– paracymbium; 19 –– embolic division; 20, 21 –– embolus (different aspects). Abbreviations used: E –– embolus; EP –– embolus proper; L –– lamella characteristica; R –– radix; TA –– terminal apophysis; Th –– thumb. Scale bar: 0.1 mm.