Cybaeus ilweolensis, Seo, 2016

Seo, Bo Keun, 2016, Seven new species of the genus Cybaeus (Araneae, Cybaeidae) from Korea, Journal of Species Research 5 (3), pp. 571-583 : 572-574

Cybaeus ilweolensis n. sp.

ëùƌặHŔ (ṳAE) ( Figs. 1 F­J, 5C, D, 6D­F, 7D­F)

Material examined. Holotype: ♂, mixed forest (36°48′ 30″N, 129°05′19″E, alt. 1012 m), 1.3 km northwest of the summit of Mt. Ilweol, Cheonggi­myeon, Yeongyanggun , Gyeongsangbuk­do, 23 July 2010, J. C. Lim . Paratype: 9♂♂, same data as holotype; 4$$, mixed forest (36°49′00″N, 129°04′53″E, alt. 976 m), 2.4 km northwest of the summit of Mt. Ilweol , 13 November 2009, S. Y. Kim .

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

Diagnosis. The new species is similar to C. seorakensis n. sp. in the abdominal pattern, and to C. jogyensis n. sp. in the embolus length of male palp, the interval between the embolic base and the conductor of male palp, the apophysis teeth number and the apophysis shape of male palpal patella, and the vesicle shape and the position of copulatory duct connected with the anterior vesicle of female spermatheca. However, the new species can be easily distinguished from C. seorakensis n. sp. by the longer embolus of male palp, the wider interval between the embolic base and the conductor of male palp, and the round apophysis of male palpal patella, and distinguished from C. jogyensis n. sp. by the body length, the abdominal pattern, the epigyne, and the medium­sized well­separated anterior vesicles and the coiled copulatory duct connected with the anterior vesicle of female spermatheca ( Figs. 1 F­J, 5C, D, 7D­F).

Description. Male (holotype). Total length 7.80. Habitus as in Fig. 5D . Carapace reddish brown, 4.40 long, 3.30 wide; radial grooves and linear fovea distinct. Clypeus height 2.8 times of diameter of ALE. AER 0.96, PER 1.17; AER and PER retrocurved slightly in dorsal view. AME 0.16, ALE 0.25, PME 0.22, PLE 0.25, AME­AME 0.10, AME­ALE 0.05, PME­PME 0.20, PME­PLE 0.16, AME­PME 0.20, and ALE­PLE 0.09. Median ocular quadrangle, posterior side>height>anterior side (47: 41: 31). Chelicera with three promarginal and seven minute retromarginal teeth. Sternum 1.90 long, 1.80 wide. Labium 0.60 long, 0.70 wide. Leg measurements: I 16.60 (4.30, 1.50, 4.30, 4.10, 2.40), II 13.90 (3.70, 1.40, 3.40, 3.40, 2.00), III 11.20 (3.00, 1.20, 2.30, 3.00, 1.70), IV 14.20 (3.70, 1.30, 3.20, 4.00, 2.00). Palp 4.80 (1.90, 0.60, 0.50, 1.80). Leg I/c 3.77. Fem. I/c 0.98. Tib. I/c 0.98. Met. I/c 0.93. Pat. I + tib. I/c 1.32. Met. I/tar. I 1.71. Met. IV/tar. IV 2.00. Leg spination pattern: Femora; I d1­1­1, p0­0­0­1­1, r0­1­0; II d1­1­1, p0­1­1­1, r0­1­0; III d1­1­1, p0­1­1, r0­1­1; IV d1­1­1, p0­1­1, r0­0­1. Tibiae; I, II d1­1, p1­1­1, v2­2­1­2; III d0­1, p1­1, r1­1, v2­2­2; IV d0­1, p1­1, r1­1, v2­1­1­2. Metatarsi; I p1­1, r1­1, v2­2­0; II p1­1­2, r1­1, v2­2­1; III p1­1­1­2, r1­1­1­ 2, v2­2­1; IV p1­1­1­2, r1­1­1­2, v2­2­1. Abdomen oval and dark gray, with three pairs of pale dots and three chevrons longitudinally, and 4.00 long, 2.90 wide. Palp ( Figs. 1 F­H, 6D­F): tibia slightly shorter than patella; patella apophysis round with 31 conical teeth; embolus long and slender, its tip nearly reaches end of conductor; interval between embolic base and conductor wide.

Female (paratype). Total length 7.70. Habitus as in Fig. 5C . Carapace 4.10 long, 2.90 wide. Clypeus height 2.5 times of diameter of ALE. AER 0.91, PER 1.18 . AME 0.14, ALE 0.21, PME 0.20, PLE 0.22, AME­AME 0.10, AME­ALE 0.05, PME­PME 0.22, PME­PLE 0.17, AME­PME 0.23, and ALE­PLE 0.09. Median ocular quadrangle, posterior side>height>anterior side (47: 41: 29). Chelicera with three promarginal and eight minute retromarginal teeth. Sternum 1.76 long, 1.70 wide. Labium 0.57 long, 0.63 wide. Leg measurements: I 11.66 (3.21, 1.32, 2.84, 2.71, 1.58), II 10.95 (3.02, 1.32, 2.52, 2.58, 1.51), III 9.70 (2.71, 1.13, 2.02, 2.39, 1.45), IV 12.03 (3.15, 1.13, 2.71, 3.34, 1.70). Palp 4.60 (1.45, 0.69, 0.82, 1.64). Leg I /c 2.84. Fem. I /c 0.78. Tib. I /c 0.69. Met. I /c 0.66. Pat. I + tib. I/c 1.01. Met. I /tar. I 1.72. Met. IV /tar. IV 1.96. Leg spination pattern: Femora; I d1­1­1, p0­0­0­1­1, r0­1­0; II d1­1­1, p0­1­1­1, r0­1­ 0; III d1­1­1, p0­1­1, r0­1­1; IV d1­1­1, p0­1­1, r0­0­1. Tibiae; I, II p1­1­1, v2­2­1­2; III p1­1­1, r1­1, v2­2­2; IV d1­1, p1­1­1, r1­1, v2­1­2. Metatarsi; I p1­1, r1­1, v2­2­ 0; II p1­1­1, r1­1, v2­2­1; III p1­1­1­2, r1­1­1­2, v2­2­ 1; IV p1­1­1­0­2, r1­1­1­2, v2­2­1. Abdomen with four pairs of pale dots and two chevrons longitudinally, and 4.41 long, 2.90 wide. Epigynum: atrium wide, with a pair of copulatory openings. Internal genitalia: spermatheca with an anterior medium­sized pear­shaped vesicle and a posterior gourd­like vesicle; coiled copulatory duct connected with anterior vesicle dorsally; fertilization duct short ( Figs. 1I, J , 7 D­F) .

Habitat. Mixed forest.

World Distribution. Korea (Gyeongsangbuk­do).

Figures

Fig. 1. Cybaeus geumensis n. sp. (A­E) and Cybaeus ilweolensis n. sp. (F­J): A, F ­ male left palp, ventral view; B, G ­ male left palp, tibia and patella, dorsal view; C, H­ditto, retrolateral view; D, I­ female internal genitalia, ventral view; E, J­ ditto, dorsal view. Scale lines: 0.1 mm.

Fig. 5. Carapaces and abdomens: A ­ Cybaeus geumensis, female; B ­ C. geumensis, male; C ­ C. ilweolensis, female; D ­ C. ilweolensis, male; E ­ C. jiriensis, female; F ­C. jiriensis, male; G ­ C. jogyensis, female; H ­ C. jogyensis, male; I­ C. odaensis, female; J ­C. odaensis, male; K ­C. seorakensis, male; L­ C. songniensis, female; M ­C. songniensis, male. Scale lines: 1.0 mm.

Fig. 7. Female genital organs (1st column ­ epigynum, 2nd ­ internal genitalia, ventral view, and 3rd ­ internal genitalia, dorsal view): Cybaeus geumensis (A­C); C. ilweolensis (D­F); C. jiriensis (G­I); C. jogyensis (J­L); C. odaensis (M­O); C. songniensis (P­R). Scale lines: 0.1mm.