Arcuphantes chilboensis, 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 : 275-277

Arcuphantes chilboensis n. sp.

ṻfl나IJḍljHḑ (ṉÿ) ( Figs. 6 F-G, 14A-F)

Material examined. Holotype: ♂, mixed forest (36°41 ʹ 29 ʺ N, 129°20 ʹ 22 ʺ E, alt. 175 m), Onjeong-myeon, Uljin-gun , Gyeongsangbuk-do, 24 July 2010, J. C. Lim . Paratypes: 2$$, same data as holotype.

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

Diagnosis. The new species is very similar to A. scitulus Paik, 1974 in the general appearance, but different from the latter by the shapes of paracymbial branches, the pseudolamella and the lamellar extension ( Fig. 14 A-C).

Description. Male (holotype). Total length 2.04. Habitus as in Figure 6F . Carapace dirty brown, 1.08 long, 0.88 wide; Clypeus height 2.2 times of diameter of AME. AER 0.40, PER 0.43. Both eye rows recurved in dorsal view. AME 0.07, ALE 0.09, PME 0.08, PLE 0.09, AME-AME 0.03, AME-ALE 0.07, PME-PME 0.07, PME-PLE 0.09, AME-PME 0.09, and ALE-PLE contiguous. Median ocular quadrangle, posterior side>height>anterior side (18:17:11). Chelicera with a tooth on each margin. Sternum 0.60 long, 0.56 wide. Labium 0.21 wide. Abdomen oval and dark brown, with six pairs of marginal dots and three medial dots, and 0.96 long, 0.68 wide. Palp ( Fig. 14 A-C): paracymbium bifurcated by a broad lower branch and a narrow upper branch, with a small hooked proximal process and a small sharp-pointed lateral process; pit hook of suprategulum distinct; anterior part of median membrane round, chitinized. Embolic division: anterior part of radix hook-like; posterior part broad; embolus proper and apex small and pointed; anterior terminal apophysis blunt, median one membranous with a serrated margin and papillae; pseudolamella bifurcate distally; lamellar extension long, membranous.

Female (paratype). Total length 2.12. Habitus as in Figure 6G . Carapace 1.00 long, 0.80 wide. Clypeus height 3 times of diameter of AME. AER 0.35, PER 0.39. AME 0.05, ALE 0.09, PME 0.09, PLE 0.09, AME-AME 0.03, AME-ALE 0.05, PME-PME 0.04, PME-PLE 0.04, AME-PME 0.09, and ALE-PLE 0.01. Median ocular quadrangle, posterior side = height>anterior side (17:10). Chelicera with three promarginal and five retromarginal teeth. Sternum 0.56 long, 0.55 wide. Labium 0.20 wide. Abdomen 1.44 long, 0.84 wide. Epigynum: scape coiled; posterior median plate broad transversely; distal part of scape with well-developed lateral lobes ( Fig. 14 D-F) .

Habitat. Mixed forest.

World Distribution. Korea (Gyeongsangbuk-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. 14. Arcuphantes chilboensis n. sp. (A-F) and Arcuphantes longiconvolutus n. sp.(G-I): A - male left palp, retrolateral view; B - idem, prolateral view; C - embolic division, ventral view; D, G - epigynum, ventral view; E, H - idem, posterior view; F, I - idem, lateral view. Scale bars: 0.1 mm.