Sudesna yangi Wang, Peng & Zhang, 2025, sp. nov.
Creators: name: Wang, Lu-Yu
name: Peng, Xian-Jin
name: Zhang, Zhi-Sheng
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Dictynidae
Sudesna
Sudesna yangi

description: Sudesna yangi sp. nov.
Figs 13, 14, 15 (杨氏苏蛛)
Type material.
Holotype ♂ (SWUC -T-DI-19-01); Yunnan Province; Dali City, Mount Cangshan, Xieyangfeng; 25°35′39″N, 100°11′23″E; elev. 2573 m; 11 September 2011; Z. Z. Yang leg. Paratypes: 3 ♂ 6 ♀ (SWUC -T-DI-19-02 to 10); same data as holotype. • 1 ♀ (SWUC -T-DI-19-11); Mount Cangshan, Dapoqing; 25°34′38″N, 100°07′51″E; elev. 2043 m; 30 August 2009; Z. Z. Yang leg. • 6 ♂ 4 ♀ (SWUC -T-DI-19-12 to 21); Mount Cangshan, Yujufeng; 25°42′21″N, 100°7′7″E; elev. 2600 m; 13 September 2009; Z. Z. Yang leg. • 1 ♂ (SWUC -T-DI-19-22); Mount Cangshan, Xieyangfeng; 25°35′24″N, 100°11′47″E; elev. 2500 m; 22 November 2011; P. Feng leg. • 2 ♀ (SWUC -T-DI-19-23 to 24); Mount Cangshan, Xieyangfeng; 5°35′40″N, 100°11′21″E; elev. 2500 m; 14 June 2011; Y. He leg. • 3 ♀ (SWUC -T-DI-19-25 to 27); Eyuan County, Cibi Township, Biaoshan; 26°09′41″N, 99°54′21″E; elev. 2310 m; 17 August 2009; Z. X. Li and L. Y. Wang leg. • 1 ♂ (SWUC -T-DI-19-28); Kunming City, Mount Xishan, Maomaoqing; 24°57′20″N, 102°37′54″E; elev. 2204 m; 13 October 2016; G. Q. Huang, X. B. Guo and Y. C. Wang leg. • 1 ♀ (SWUC -T-DI-19-29); Baoshan City, Longyang District, Mangkuan Township, Mount Gaoligong; 25°18′27″N, 98°47′42″E; elev. 1496 m; 6 October 2015; T. Lu and Y. C. Zhou leg. • 2 ♀ (SWUC -T-DI-19-30 to 31); Baoshan City, Longyang District, Mangkuan Township, Mount Gaoligong; 25°18′05″N, 98°47′24″E; elev. 1793 m; 8 October 2015; T. Lu and Y. C. Zhou leg.
Etymology.
This species is named after the collector of the holotype and some paratype material; a noun in genitive case.
Diagnosis.
The male of this new species is similar to S. circularis Zhang & Li, 2011 (Zhang and Li 2011: 30, figs 8 A – C, 9 A – F) in having a long embolus and lacking tibial ctenidia, but it can be distinguished by the pale opisthosoma (vs yellow-brown with black markings) (Fig. 14 A) and the embolus originating at the 9: 00 o’clock position (vs 8: 30) (Figs 13 A – C, 14 C – E). For the diagnosis of the female of S. yangi, see S. cangshan sp. nov. part.
Description.
Male holotype (Fig. 14 A) total length 3.76. Prosoma 1.70 long, 1.42 wide; opisthosoma 2.13 long, 1.48 wide. Dorsum of prosoma brown, with high cephalic area. Eye sizes and interdistances: AME 0.07, ALE 0.11, PME 0.10, PLE, 0.11; AME – AME 0.14, AME – ALE 0.11, PME – PME 0.15, PME – PLE 0.16, ALE – PLE 0.02. MOA 0.29 long, anterior width 0.26, posterior width 0.32. Clypeus height 0.16. Chelicerae stout, brown, with 4 promarginal and 3 retromarginal teeth. Legs yellow-brown. Leg measurements: I 6.08 (1.86, 2.18, 1.28, 0.76); II 6.34 (1.72, 2.02, 1.90, 0.70); III 4.02 (1.27, 1.28, 0.93, 0.54); IV 4.48 (1.36, 1.54, 1.08, 0.50). Leg formula: 1243. Opisthosoma oval. Dorsum and venter pale. Spinnerets short and yellowish brown.
Palp (Figs 13 A, B, 14 C – E). Tibia without ctenidia. Retrolateral tibial apophysis hook-shaped in retrolateral view. Embolus somewhat O-shaped and originating at about the 9: 00 o’clock position, terminating at about the 5: 00 o’clock position. Anterior arm of conductor (AA) tapering and distally reaching the 12: 30 o’clock position; posterior arm (PA) spiral, with a pointed, scaly tip.
Female paratype (SWUC -T-DI-19-02, Fig. 14 B) total length 3.78. Prosoma 1.36 long, 1.13 wide; opisthosoma 2.67 long, 1.99 wide. Dorsum of prosoma yellowish brown, with high cephalic area. Eye sizes and interdistances: AME 0.05, ALE 0.10, PME 0.09, PLE, 0.09; AME – AME 0.13, AME – ALE 0.10, PME – PME 0.14, PME – PLE 0.15, ALE – PLE 0.05. MOA 0.25 long, anterior width 0.23, posterior width 0.31. Clypeus height 0.14. Legs yellow-brown. Leg measurements: I 5.14 (1.61, 1.75, 1.07, 0.71); II 4.66 (1.52, 1.52, 1.00, 0.62); III 3.81 (1.20, 1.24, 0.85, 0.52); IV 4.58 (1.41, 1.59, 1.06, 0.52). Leg formula: 1243. Opisthosoma oval. Dorsum and venter pale. Spinnerets short and yellowish brown.
Epigyne (Figs 13 C, D, 14 F, G). Copulatory openings large, 9 - shaped, facing away from each other, separated by about 1.7 times their width. Copulatory ducts slightly sclerotized, long and abruptly bent. Spermatheca clavate, spermathecal heads round. Fertilization ducts semicircular, directed laterally.
Variation.
Male (n = 12) total length 3.76–4.15; female (n = 16) total length 3.78–4.57.
Distribution.
China (Yunnan) (Fig. 15).
description: Published as part of Wang, Lu-Yu, Peng, Xian-Jin & Zhang, Zhi-Sheng, 2025, Six new species and a new synonym of the mesh-web spider genus Sudesna Lehtinen, 1967 (Araneae, Dictynidae) from China, pp. 127-149 in ZooKeys 1234 on pages 127-149, DOI: 10.3897/zookeys.1234.145300