Collis pusillus, 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 : 281-283

Collis pusillus n. sp.

ẅêüjḍljHḑ (ṉÿ) ( Figs. 6 O-P, 17A-G)

Material examined. Holotype: ♂, mixed forest (35°27 ʹ 54 ʺ N, 126°52 ʹ 35 ʺ E, alt. 390 m), Bokheung-myeon, Sunchang-gun , Jeollabuk-do, 13 May 2006, B. K. Seo . Paratypes: 5♂♂, 1$, same data as holotype .

Etymology. The specific name is a Latin adjective “ pusillus ” (very small), referring to the size of the type specimens.

Diagnosis. The new species is very similar to C. silvaticus n. sp. in the general appearance and male palp structure, but different from the latter by the detailed shape of paracymbium, lamella characteristica, and the radix tip in prolateral view ( Fig. 17 A-D).

Description. Male (holotype). Total length 1.12. Habitus as in Figure 6O . Carapace deep yellow, 0.58 long, 0.48 wide. Clypeus height 3 times of diameter of AME. AER 0.17, PER 0.21. AER recurved and PER straight in dorsal view. AME 0.03, ALE 0.05, PME 0.04, PLE 0.05, AME-AME 0.01, AME-ALE 0.01, PME-PME 0.03, PME-PLE 0.03, AME-PME 0.03, and ALE-PLE contiguous. Median ocular quadrangle, height = posteri- or side>anterior side (9:5). Chelicera with six promarginal and five retromarginal teeth. Sternum 0.36 long, 0.34 wide. Labium 0.12 wide. Leg measurements: I 1.64 (0.47, 0.18, 0.39, 0.31, 0.29), II 1.48 (0.42, 0.16, 0.34, 0.27, 0.29), III 1.28 (0.35, 0.16, 0.26, 0.25, 0.26), IV 1.70 (0.47, 0.17, 0.44, 0.33, 0.29). Leg I/c 2.83. Fem. I/ c 0.81. Tib. I/c 0.67. Met. I/c 0.53. Pat. I + tib. I/c 0.98. Met. I/tar. I 1.07. Met. IV/tar. IV 1.14. Chaetotaxy 2-2- 2-1). Tm 1 0.39, Tm IV absent. Abdomen oval and dark brown, and 0.60 long, 0.42 wide. Palp ( Fig. 17 A-D): paracymbium base with two blunt and a small point- ed processes; reverse triangular lamella characteristica with two pointed dorsal process; terminal apophysis membranous and chitinized, divided two part; embolus curved, very long and slim; distal suprategular apophysis bifurcate.

Female (paratype). Total length 1.32. Habitus as in Figure 6P . Carapace yellow, and 0.70 long, 0.56 wide.

Clypeus height 3 times of diameter of AME. AER 0.20, PER 0.22. AME 0.03, ALE 0.05, PME 0.04, PLE 0.05, AME-AME 0.01, AME-ALE 0.01, PME-PME 0.03, PME-PLE 0.03, AME-PME 0.04, and ALE-PLE contiguous. Median ocular quadrangle, posterior side = height>anterior side (9:5). Chelicera with six promarginal and five retromarginal teeth. Sternum 0.39 long, 0.36 wide. Labium 0.14 wide. Leg measurements:

I 1.63 (0.46, 0.18, 0.38, 0.30, 0.31), II 1.49 (0.40, 0.18, 0.33, 0.29, 0.29), III 1.35 (0.36, 0.17, 0.29, 0.26, 0.27), IV lost. Leg I/c 2.72. Fem. I/c 0.77. Tib. I/c 0.63. Met. I/c 0.50. Pat. I + tib. I/c 0.93. Met. I/tar. I 0.97. Chaetotaxy 2-2-2- (lost). Tm 1 0.39, Tm IV absent. Abdomen dirty yellow, and 0.90 long, 0.54 wide. Epigynum: ventral plate broad and blunt, two layered, and protruded posteriorly; scape small; internal genitalia with a pair of spermathecae and copulatory ducts ( Fig. 17 E-G).

Habitat. Mixed forest.

World Distribution. Korea (Jeollabuk-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. 17. Collis pusillus n. sp.(A-G) and Collis silvaticus n. sp.(H-K):A, H - male left palp, retrolateral view; B, I - idem, prolateral view; C, J - paracymbium; D, K - lamella characteristica; E-F - epigynum; G - internal genitalia. Scale bars: 0.1 mm.