Yaginumia medog Mi & Wang 2025, sp. nov.
Creators: name: Mi, Xiaoqi
name: Wang, Cheng
name: Su, Ming
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Araneidae
Yaginumia
Yaginumia medog

description: 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).
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.
description: Published as part of Mi, Xiaoqi, Wang, Cheng & Su, Ming, 2025, Revision of the orb-weaving spider genus Yaginumia Archer, 1960 (Araneae, Araneidae) from China, pp. 169-184 in ZooKeys 1223 on pages 169-184, DOI: 10.3897/zookeys.1223.139465