Revision of the orb-weaving spider genus Yaginumia Archer, 1960 (Araneae, Araneidae) from China Author Mi, Xiaoqi 0000-0003-1744-3855 College of Agriculture and Forestry Engineering and Planning, Guizhou Provincial Key Laboratory of Biodiversity Conservation and Utilization in the Fanjing Mountain Region, Tongren University, Tongren 554300, Guizhou, China Author Wang, Cheng 0000-0003-1831-0579 College of Agriculture and Forestry Engineering and Planning, Guizhou Provincial Key Laboratory of Biodiversity Conservation and Utilization in the Fanjing Mountain Region, Tongren University, Tongren 554300, Guizhou, China Author Su, Ming Central South Inventory and Planning Institute of National Forestry and Grassland Administration, Changsha 410007, Hunan, China text ZooKeys 2025 2025-01-06 1223 169 184 journal article 307237 10.3897/zookeys.1223.139465 d1b4aed3-9e31-44d7-a5a2-f486d9d644f5 52BDCEAA-AE32-4D82-B646-84E3F02A2EA2 Yaginumia medog Mi & Wang sp. nov. Figs 1 , 2 , 7 Type material. Holotype : China • ♂ ; Xizang Autonomous Region , Medog County , Beibeng Township , De’ergong Village ; 29 ° 10.84 ' N , 95 ° 8.67 ' E ; ca 1670 m elev.; 25. V. 2024 ; X. Q. Mi et al. leg.; TRU - Araneidae -326 . Paratypes : 2 ♀♀ ; same data as for holotype; TRU - Araneidae -327 –328 . Etymology. The species name is a noun derived from the type locality: Medog County. Diagnosis. The new species resembles Y. qiong sp. nov. in appearance and genitalia structures, but it can be distinguished as follows: 1) median apophysis strongly curled about 90 ° in ventral view (Fig. 2 C ) vs slightly curled about 45 ° (Fig. 4 C ); 2) basal part of paracybium ~ 2.1 × wider than distal part in retrolateral view (Fig. 2 B ) vs ~ 3.4 × wider (Fig. 4 B ); 3) copulatory openings arcuate (Fig. 1 A ) vs almost rounded (Fig. 3 A ); 4) spermathecae touching to each other (Fig. 1 C, D ) vs separated (Fig. 3 C, D ); and 5) legs with annuli (Fig. 1 E, H ) vs lacking (Fig. 3 E, H ). Figure 1. Yaginumia medog Mi & Wang , sp. nov. A – G female paratype TRU - Araneidae -327 H – J male holotype A epigyne, ventral view B ibid., posterior view C vulva, posterior view D ibid., dorsal view E, H habitus, dorsal view F, I ibid., ventral view G, J ibid., lateral view. Abbreviations: CD copulatory duct, CO copulatory opening, FD fertilization duct, Sp spermatheca. Scale bars: 0.1 mm ( A – D ); 1.0 mm ( E – J ). Figure 2. Yaginumia medog Mi & Wang , sp. nov. male holotype A pedipalp, prolateral view B ibid., retrolateral view C ibid., ventral view D ibid., apical view E part of expanded bulb. Scale bars: 0.1 mm. Abbreviations: C conductor, E embolus, MA median apophysis, Pc paracymbium, TA terminal apophysis, TP tegular projection. Description. Male ( holotype , Figs 1 H – J , 2 ). Total length 3.20. Carapace 1.85 long, 1.35 wide. Abdomen 2.10 long, 1.45 wide. Clypeus 0.05 high. Eye sizes and interdistances: AME 0.13, ALE 0.08, PME 0.10, PLE 0.08, AME – AME 0.10, AME – ALE 0.10, PME – PME 0.05, PME – PLE 0.18, MOA length 0.30, anterior width 0.33, posterior width 0.25. Leg measurements: I 6.65 (1.85, 2.40, 1.70, 0.70), II 5.70 (1.60, 2.05, 1.40, 0.65), III 3.50 (1.10, 1.10, 0.75, 0.55), IV 4.55 (1.40, 1.55, 1.10, 0.50). Carapace dark brown in cephalic region and yellowish-brown in thoracic region. Cervical groove conspicuous. Chelicerae dark brown, with four promarginal and three retromarginal teeth. Endites and labium dark brown at base, with paler tip. Sternum dark brown. Legs yellow with brown annuli. Abdomen ~ 1.45 × longer than wide, dorsal folium extended from anterior to posterior, grayish-brown with white spots anteriorly. Venter abdomen yellow to yellowish-brown. Spinnerets yellowish-brown. Pedipalp (Fig. 2 ): tibia ~ 1.78 × longer than wide in ventral view; paracybium enlarged at base and lobe-like distally; tegular projection triangular, with toothed inner edge; median apophysis tapered and curled about 90 ° distally in ventral view; embolus almost straight, shorter than conductor; conductor membranous; terminal apophysis weakly sclerotized, covering embolus. Female ( paratype TRU - Araneidae -327 , Fig. 1 A – G ). Total length 4.55. Carapace 2.10 long, 1.55 wide. Abdomen 2.90 long, 2.30 wide. Clypeus 0.05 high. Eye sizes and interdistances: AME 0.13, ALE 0.08, PME 0.13, PLE 0.08, AME – AME 0.13, AME – ALE 0.08, PME – PME 0.05, PME – PLE 0.20, MOA length 0.33, anterior width 0.35, posterior width 0.28. Leg measurements: I 6.75 (2.00, 2.45, 1.55, 0.75), II 5.80 (1.75, 2.05, 1.30, 0.70), III 3.85 (1.25, 1.30, 0.75, 0.55), IV 5.30 (1.70, 1.85, 1.15, 0.60). Habitus similar to that of male. Epigyne (Fig. 1 A – D ): ~ 1.57 × wider than long in ventral view; copulatory openings arcuate, situated on ventral surface; copulatory ducts twisted, about equal length to spermathecal diameter; spermathecae rounded, touching. Variation. Total length: ♀♀ 3.15–3.30 ( N = 2). Distribution. China ( Xizang ). Comment. Judging from the broken vestige, we conclude it must have an epigynal scape.