Sudesna dali, Wang & Peng & Zhang, 2025

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, ZooKeys 1234, pp. 127-149 : 127-149

publication ID	https://doi.org/10.3897/zookeys.1234.145300
publication LSID	lsid:zoobank.org:pub:6DB976C7-4B5C-42C7-AA7E-D239CF3241CB
DOI	https://doi.org/10.5281/zenodo.15183781
persistent identifier	https://treatment.plazi.org/id/2D4F6880-5E9E-50F1-AD91-58A02A6BFB29
treatment provided by	ZooKeys by Pensoft
scientific name	Sudesna dali
status	sp. nov.

Treatment

Sudesna dali sp. nov.

Figs 3 View Figure 3 , 4 View Figure 4 , 15 (大理苏蛛 View Figure 15 )

Type material.

Holotype ♂ ( SWUC -T-DI-15-01 ); Yunnan Province; Dali City, Mount Cangshan, Dapoqing ; 25°34′59″N, 100°08′09″E; elev. 2500 m; 8 November 2009; T. B. Yang leg. GoogleMaps Paratypes: 1 ♂ 3 ♀ ( SWUC -T-DI-15-02 to 05); same data as for holotype GoogleMaps • 3 ♂ 2 ♀ ( SWUC -T-DI-15-06 to 10); Mount Cangshan, Yujufeng ; 25°42′14″N, 100°07′09″E; elev. 2700 m; 10 April 2011; L. Yang leg. GoogleMaps • 2 ♀ ( SWUC -T-DI-15-11 to 12); Mount Cangshan ; elev. 2500 m; 15 January 2009; Z. Z. Yang leg. • 4 ♂ 16 ♀ ( SWUC -T-DI-15-13 to 32); Mount Cangshan, Xieyangfeng ; 25°36′04″N, 100°11′11″E; elev. 2559 m; 14 June 2011; K. C. Zhang leg. GoogleMaps • 1 ♂ ( SWUC -T-DI-15-33 ); Mount Cangshan, Xieyangfeng ; 25°35′54″N, 100°11′13″E; elev. 2700 m; 14 June 2011; Z. X. Bao leg. GoogleMaps • 1 ♂ ( SWUC -T-DI-15-34 ); Mount Cangshan; Xieyangfeng ; 25°35′58″N, 100°11′7″E; elev. 2500 m; 10 April 2011; N. J. Li leg. GoogleMaps • 1 ♂ 1 ♀ ( SWUC -T-DI-15-35 to 36); Mount Cangshan, Xieyangfeng ; 25°35′54″N, 100°11′13″E; elev. 2615 m; 15 January 2009; Z. Z. Yang leg. GoogleMaps

Etymology.

The specific name is derived from the county where the type locality is located; used as a noun in apposition.

Diagnosis.

This new species is similar to S. hainan sp. nov. (Figs 7 View Figure 7 , 8 View Figure 8 ) in having a semicircular embolus and short copulatory ducts, but it can be distinguished by the triangular (dorsal view) retrolateral tibial apophysis (vs semicircular, lamellate), the finger-shaped and untwisted posterior arm (PA) of the conductor (vs somewhat S-shaped) (Figs 3 A – C View Figure 3 , 4 C – E View Figure 4 ), and the absence of a stem of the spermathecal head (vs present) (Figs 3 E View Figure 3 , 4 G View Figure 4 ).

Description.

Male holotype (Fig. 4 A View Figure 4 ) total length 2.00. Prosoma 0.86 long, 0.78 wide; Opisthosoma 1.20 long, 0.75 wide. Dorsum of prosoma brown, with high cephalic area. Eye sizes and interdistances: AME 0.03, ALE 0.04, PME 0.04, PLE, 0.04; AME – AME 0.09, AME – ALE 0.06, PME – PME 0.08, PME – PLE 0.10, ALE – PLE 0.02. MOA 0.14 long, anterior width 0.14, posterior width 0.16. Clypeus height 0.09. Chelicerae stout, yellow-brown, with 3 promarginal teeth and 1 retromarginal tooth. Legs yellowish. Leg measurements: I 2.76 (0.84, 0.95, 0.59, 0.38); II 2.56 (0.78, 0.88, 0.50, 0.40); III 2.03 (0.62, 0.65, 0.46, 0.30); IV 2.28 (0.73, 0.69, 0.55, 0.31). Leg formula: 1243. Opisthosoma oval. Dorsum with black and white markings. Venter yellow brown. Spinnerets short and yellow-brown, with black markings.

Palp (Figs 3 A, B View Figure 3 , 4 C – E View Figure 4 ). Tibia dorsally with 2 ctenidia, located at 1 / 3 length of tibia from the distal-most part. Retrolateral tibial apophysis triangular in dorsal view. Embolus semicircular and originating at about the 10: 00 o’clock position and terminating at about the 4: 30 o’clock position. Anterior arm of conductor (AA) short and membranous; posterior arm (PA) finger-shaped with sharply pointed tip.

Female paratype ( SWUC -T-DI-15-02 , Fig. 4 B View Figure 4 ) total length 2.46. Prosoma 0.86 long, 0.81 wide; opisthosoma 1.64 long, 1.30 wide. Dorsum of prosoma yellow-brown, with high cephalic area. Eye sizes and interdistances: AME 0.04, ALE 0.04, PME 0.04, PLE, 0.04; AME – AME 0.07, AME – ALE 0.06, PME – PME 0.08, PME – PLE 0.08, ALE – PLE 0.02. MOA 0.13 long, anterior width 0.14, posterior width 0.16. Clypeus height 0.06. Leg measurements: I 2.41 (0.75, 0.81, 0.49, 0.36); II 2.32 (0.71, 0.79, 0.48, 0.34); III 1.98 (0.62, 0.63, 0.46, 0.27); IV 2.29 (0.72, 0.78, 0.51, 0.28). Legs yellowish. Leg formula: 1243. Opisthosoma oval. Dorsum yellow-brown, with white scaly markings. Venter yellow-brown. Spinnerets short and yellow brown.

Epigyne (Figs 3 C, D View Figure 3 , 4 F, G View Figure 4 ). Copulatory openings semicircular, facing each other, separated by about 4 times their width. Copulatory ducts membranous, short, as long as width. Spermatheca peanut-shaped, spermathecal heads somewhat ball-shaped. Fertilization ducts semicircular, directed laterally, the length is 2.5 times the width of the copulatory openings.

Variation.

Male (n = 12) total length 1.87–2.13; female (n = 24) total length 2.18–2.71.

Distribution.

Known only from the type locality, Yunnan, China (Fig. 14 View Figure 14 ).