Arcuphantes chiakensis, Seo, 2018

Seo, Bo Keun, 2018, New species and records of the spider families Pholcidae, Uloboridae, Linyphiidae, Theridiidae, Phrurolithidae, and Thomisidae (Araneae) from Korea, Journal of Species Research 7 (4), pp. 251-290 : 275

Arcuphantes chiakensis n. sp.

Ñọ나IJḍljHḑ (ṉÿ) ( Figs. 6 D-E, 13F-K)

Material examined. Holotype: ♂, mixed forest (37°20 ʹ 42 ʺ N, 128°06 ʹ 16 ʺ E, alt. 488 m), Gangnim-myeon, Hoengseong-gun, Gangwon-do, 21 July 2010, J. C. Lim. Paratypes: 2$$, same data as holotype.

Etymology. The specific name comes from the type lo- cality, Mt. Chiak.

Diagnosis. The new species is very similar to A. rarus Seo, 2013 in the general appearance, but can be recognized by the round tip of posterior part of radix, the shape of anterior pseudolamella, and the lamellar extension with a small triangular process at base ( Fig. 13 F-H).

Description. Male (holotype). Total length 2.84. Habitus as in Figure 6D . Carapace reddish brown, 1.32 long, 1.24 wide. Clypeus height 3 times of diameter of AME. AER 0.49, PER 0.55. Both eye rows recurved in dorsal view. AME 0.07, ALE 0.12, PME 0.10, PLE 0.10, AME-AME 0.03, AME-ALE 0.10, PME-PME 0.06, PME-PLE 0.08, AME-PME 0.10, and ALE-PLE 0.01. Median ocular quadrangle, posterior side>height>anterior side (20:19:12). Chelicera with two promarginal teeth. Sternum 0.75 long, 0.78 wide. Labium 0.23 wide. Abdomen oval and dark brown with a longitudinal pale band on each anterior margin and four transverse pale bands posteriorly, and 1.48 long, 0.58 wide. Palp ( Fig. 13 F-H): paracymbium bifurcated by a blade-like low- er branch and a long bent upper branch, with a small proximal process and a sharp-pointed lateral process; pit hook of suprategulum reduced; anterior part of median membrane round, chitinized, other median membrane transparent with a papillae portion. Embolic division: anterior part of radix hook-like; posterior part broad with some nodules along margin; embolus proper and apex small and pointed; anterior terminal apophysis triangular, median one membranous with a serrated margin and papillae; pseudolamella bifurcate distally, posterior without spines on distal part and anterior with a big triangular chitinized lamella; lamellar extension triangular, membranous, with a small triangular process at base.

Female (paratype). Total length 2.48. Habitus as in Figure 5E . Carapace 1.20 long, 1.04 wide. Clypeus height 3 times of diameter of AME. AER 0.44, PER 0.48. AME 0.07, ALE 0.10, PME 0.09, PLE 0.09, AME-AME 0.03, AME-ALE 0.07, PME-PME 0.07, PME-PLE 0.07, AME-PME 0.12, and ALE-PLE 0.01. Median ocular quadrangle, posterior side = height>anterior side (19:12). Chelicera with three promarginal and five retromarginal teeth. Sternum 0.68 long, 0.70 wide. Labium 0.20 wide. Abdomen dark brown with four pairs of marginal dots and three medial dots, 1.52 long, 1.04 wide. Epigynum: scape long coiled, basal part broad; posterior median plate with projections on both sides; distal part of scape with well-developed lateral lobes ( Fig. 13 I-K) .

Habitat. Mixed forest.

World Distribution. Korea (Gangwon-do).

Deposition. NIBR.

Identifier. Bo Keun Seo.

Figures

Fig. 6. Habitus of linyphiid species (II): A - Agyneta furcula n. sp., male; B - idem, female; C - Agyneta insulana Tanasevitch, 2000, male; D - Arcuphantes chiakensis n. sp., male; E - idem, female; F - Arcuphantes chilboensis n. sp., male; G - idem, female; H - Arcuphantes longiconvolutus n. sp., female; I - Arcuphantes namweonensis n. sp., male; J - Arcuphantes pennatoides n. sp., male; K - idem, female; L - Arcuphantes pyeongchangensis n. sp., male; M - Collis flavus n. sp., male; N - idem, female; O - Collis pusillus n. sp., male; P - idem, female; Q - Collis silvaticus n. sp., male; R - Doenitzius minutus n. sp., female; S - Nippononeta bituberculata n. sp., male; T - idem, female. Scale bars: 0.5 mm.

Fig. 13. Agyneta insulana Tanasevitch, 2000 (A-E) and Arcuphantes chiakensis n. sp.(F-K): A, F - male left palp, retrolateral view; B, G - idem, prolateral view; C, H - embolic division, ventral view; D - idem, dorsal view; E - lamella characteristica; I -epigynum, ventral view; J - idem, lateral view; K - posterior view. Scale bars: 0.1 mm.

Fig. 5. Habitus of linyphiid species (I): A -Cnephalocotes ferrugineus n. sp., male; B - idem, female; C - Diplocephaloides falcatus n. sp., male; D - idem, female; E - Hylyphantes nigritus (Simon, 1881), male; F - idem, female; G - Hypselistes australis Saito and Ono, 2001, female; H - Metopobactrus cornis n. sp., male; I - Pelecopsis bigibba n. sp., male; J - idem, female; K - Pelecopsis brunea n. sp., male; L - idem, female; M - Pelecopsis montana n. sp., male; N - Tapinocyba parva n. sp., male; O - idem, female; P - Tapinocyba subula n. sp., male; Q - idem, female; R - Walckenaeria supercilia n. sp., male; S - Diplostyla concolor(Wider, 1834), male; T - idem, female. Scale bars: 0.5 mm.