Pelecopsis bigibba, 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 : 262-263

Pelecopsis bigibba n. sp.

ṣậPnjḍljHḑ (ṉÿ) ( Figs. 5 I-J, 9A-H)

Material examined. Holotype: ♂, mixed forest (35°26 ʹ 27 ʺ N, 126°52 ʹ 54 ʺ E, alt. 189 m), Bukha-myeon, Jangseong-gun , Jeollanam-do, 13 May 2006, B. K. Seo . Paratypes: 1♂, 1$, same data as holotype .

Etymology. The specific name is a Latin adjective “ bigibba ” (two-humped), referring to the shape of the raised head.

Diagnosis. The new species is similar to P. bicornuta Hillyard, 1980 in the male cephalon and palp, and female internal genitalia, but easily distinguished from different from the latter by the shape of head elevation, tibial apophyses and embolic division, and vesicles and spermathecae of internal genitalia ( Fig. 9 A-E, H).

Description. Male (holotype). Total length 1.29. Habitus as in Figure 5I . Carapace brown, 0.77 long, 0.59 wide; cephalon with two dorsal elevation, anterior one small with AME, posterior one large and bifurcate with PME; a pair of sulci present behind PLE. Clypeus height 5 times of diameter of AME. AER 0.22, PER 0.23; AER recurved strongly and PER procurved slightly in dorsal view. AME 0.04, ALE 0.04, PME 0.04, PLE 0.04, AME-AME 0.01, AME-ALE 0.05, PME-PME 0.05, PME-PLE 0.10, AME-PME 0.13, and ALE-PLE 0.01. Median ocular quadrangle, height>posterior side>anterior side (16:10:7). Chelicera with five promarginal and three retromarginal teeth. Sternum 0.39 long, 0.40 wide. Labium 0.12 wide. Leg measurements: I 1.66 (0.46, 0.20, 0.40, 0.34, 0.26), II 1.57 (0.44, 0.18, 0.36, 0.33, 0.26), III 1.42 (0.39, 0.18, 0.30, 0.30, 0.25), IV 1.77 (0.51, 0.18, 0.44, 0.38, 0.26). Leg I/c 2.16. Fem. I/c 0.60. Tib. I/c 0.52. Met. I/c 0.44. Pat. I + tib. I/c 0.78. Met. I/ tar. I 1.31. Met. IV/tar. IV 1.46. Chaetotaxy 1-1-1-1 (very small spines). Tm 1 0.69, Tm IV absent. Abdomen oval and dark brown, 0.68 long, 0.55 wide. Palp ( Fig. 9 C- E): tibia with three dorsal apophyses; tegular apophysis short and pointed; suprategular apophysis curved ventrally, narrow and membranous; embolus and terminal apophysis curled.

Female (paratype). Total length 1.34. Habitus as in Figure 5J . Carapace 0.65 long, 0.53 wide. Clypeus height 3.3 times of diameter of AME. AER 0.22, PER 0.23. AME 0.04, ALE 0.05, PME 0.05, PLE 0.04, AME-AME 0.01, AME-ALE 0.03, PME-PME 0.04, PME-PLE 0.04, AME-PME 0.05, and ALE-PLE 0.01. Median ocular quadrangle, height>posterior side>anterior side (11:10:7). Chelicera with five promarginal and three retromarginal teeth. Sternum 0.38 long, 0.42 wide. Labium 0.13 wide. Leg measurements: I 1.65 (0.49, 0.20, 0.38, 0.33, 0.25), II 1.52 (0.46, 0.18, 0.33, 0.30, 0.25), III 1.37 (0.39, 0.17, 0.27, 0.29, 0.25), IV 1.77 (0.55, 0.17, 0.43, 0.36, 0.26). Leg I/c 2.54. Fem. I/c 0.75. Tib. I/c 0.58. Met. I/c 0.51. Pat. I + tib. I/c 0.89. Met. I/tar. I 1.32. Met. IV/tar. IV 1.38. Chaetotaxy 1-1-1-1. Tm 1 0.68, Tm IV absent. Abdomen 0.88 long, 0.72 wide. Epigynum: atrium broad with a pair of copulatory openings at posterior margin; internal genitalia with a pair of vesicles and a pair of spermathecae ( Fig. 9 F-H).

Habitat. Mixed forest.

World Distribution. Korea (Jeollanam-do).

Deposition. NIBR.

Identifier. Bo Keun Seo.

Figures

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.

Fig. 9. Pelecopsis bigibba n. sp. (A-H) and Pelecopsis brunea n. sp. (I-O): A - male head, frontal view; B - idem, lateral view; C, I - male left palp, retrolateral view; D, J - prolateral view; E, K - idem, ventral view; L - idem, tibial apophysis, dorsal view; F-G, M-N - epigynum; H, O - internal genitalia. Scale bars: 0.1 mm.