Sudesna hainan, 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

Sudesna hainan sp. nov.

Figs 7 , 8 , 15 (海南苏蛛 )

Type materials.

Holotype ♂ ( SWUC -T-DI-17-01 ); Hainan Province; Changjiang County, Bawangling ; 19°07′51″N, 109°03′22″E; elev. 739 m; 21 May 2009; G. X. Han leg. Paratypes: 1 ♂ 13 ♀ ( SWUC -T-DI-17-02 to 15); same data as holotype • 2 ♀ ( SWUC -T-DI-17-16 to 17); Bawangling, Yajia ; 19°04′46″N, 109°07′35″E; elev. 624 m; 19 May 2009; G. X. Han leg. • 2 ♀ ( SWUC -T-DI-17-18 to 19); Diaoluoshan National Nature Reserve ; 18°40′08″N, 109°53′53″E; elev. 2225 m; June 2009; G. X. Han leg. • 3 ♀ ( SWUC -T-DI-17-20 to 22); Jianfengling National Nature Reserve, Zhufeng ; 18°42′35″N, 108°52′35″E; elev. 960 m; 31 May 20009; G. X. Han leg. • 5 ♀ ( SWUC -T-DI-17-23 to 27); Jianfengling National Nature Reserve, Tianchi ; 18°44′38″N, 108°51′43″E; elev. 811 m; 29 May 20009; G. X. Han leg. • 2 ♂ 7 ♀ ( SWUC -T-DI-17-28 to 36); Jianfengling National Nature Reserve, Yulingu ; 18°44′59″N, 108°55′16″E; elev. 680 m; 1 June 2009; G. X. Han leg. • 2 ♂ 4 ♀ ( SWUC -T-DI-17-37 to 42); Tunchang County, Xichang Town ; 19°25′55″N, 110°2′48″E; elev. 124 m; 11 June 2009; G. X. Han leg. • 1 ♂ 1 ♀ ( SWUC -T-DI-17-43 to 44); Wuzhishan City, Shuiman Township, Wuzhishan National Nature Reserve ; 18°54′23″N, 109°40′51″E; elev. 747 m; Q. L. Lu leg.

Etymology.

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

Diagnosis.

See the diagnosis of S. dali sp. nov.

Description.

Male holotype (Fig. 8 A ) total length 2.30. Prosoma 0.91 long, 0.84 wide; opisthosoma 1.48 long, 0.98 wide. Dorsum of prosoma brown, with white high cephalic area. Eye sizes and interdistances: AME 0.04, ALE 0.10, PME 0.08, PLE, 0.09; AME – AME 0.07, AME – ALE 0.04, PME – PME 0.06, PME – PLE 0.10, ALE – PLE 0.02. MOA 0.20 long, anterior width 0.15, posterior width 0.22. Clypeus height 0.04. Chelicerae stout, brown, with 3 promarginal teeth and 1 retromarginal tooth. Legs yellow-brown (femur I brown). Leg measurements: I 3.27 (1.04, 1.16, 0.62, 0.45); II 3.05 (1.03, 1.02, 0.57, 0.43); III 2.35 (0.75, 0.74, 0.50, 0.36); IV 2.59 (0.81, 0.85, 0.54, 0.39). Leg formula: 1243. Opisthosoma almost pyriform. Dorsum white, with a few short, strong spines. Venter yellowish brown. Spinnerets short and yellowish brown with black markings.

Palp (Figs 7 A, B , 8 C – E ). Tibia dorsally with 2 ctenidia, located at middle. Retrolateral tibia apophysis lamellate. Embolus semicircular and originating at about the 11: 30 o’clock position, terminating at about the 4: 00 o’clock position. Anterior arm of conductor (AA) membranous, terminating at about the 1: 30 o’clock position; posterior arm (PA) backwards S-shaped in retrolateral view, with a blunt, scaly tip.

Female paratype ( SWUC -T-DI-17-02 , Fig. 8 B ) total length 2.42. Prosoma 0.85 long, 0.79 wide; opisthosoma 1.58 long, 1.24 wide. Dorsum of prosoma yellowish brown, with white high cephalic area. Eye sizes and interdistances: AME 0.03, ALE 0.08, PME 0.07, PLE, 0.08; AME – AME 0.06, AME – ALE 0.03, PME – PME 0.05, PME – PLE 0.07, ALE – PLE 0.02. MOA 0.17 long, anterior width 0.11, posterior width 0.17. Clypeus height 0.04. Legs yellowish brown, with black markings. Leg measurements: I 2.87 (0.87, 1.00, 0.60, 0.40); II 2.85 (0.93, 0.94, 0.57, 0.41); III 2.25 (0.70, 0.70, 0.51, 0.34); IV 2.55 (0.77, 0.84, 0.54, 0.40). Leg formula: 1243. Opisthosoma oval. Dorsum yellowish brown, with a few black markings and many white scaly markings. Venter yellowish brown. Spinnerets short and yellow-brown with black markings.

Epigyne (Figs 7 C, D , 8 F, G ). Copulatory openings nearly 9 - shaped, facing away from each other, separated by about 4.5 times their width. Copulatory ducts slightly sclerotized, short, slightly curved. Spermatheca curved, spermathecal heads round. Fertilization ducts thin, semicircular, and directed laterally.

Variation.

Male (n = 5) total length 1.91–2.30; female (n = 37) total length 2.24–2.42.

Distribution.

China (Hainan) (Fig. 15 ).

Figures

Figure 7. Sudesna hainan sp. nov. holotype male (A – C) and paratype female (D, E). A Left male palp, ventral view B same, retrolateral view C same, dorsal view D epigyne, ventral view E vulva, dorsal view. Abbreviations: AA = anterior arm of conductor; CD = copulatory duct; CO = copulatory opening; Ct = ctenidia; Em = embolus; FD = fertilization duct; PA = posterior arm of conductor; RTA = retrolateral tibial apophysis; S = spermathecal; SH = spermathecal head.

Figure 8. Sudesna hainan sp. nov. holotype male (A, C – E) and paratype female (B, F, G). A Male habitus, dorsal view B female habitus, dorsal view C left male palp, ventral view D same, retrolateral view E same, dorsal view F epigyne, ventral view G vulva, dorsal view.

Figure 15. Distribution of Sudesna species in China.