Yaginumaella zhangae Wang & Mi, sp. nov.

Figures 7A–C, 8A–H

Type material. Holotype: ♂ (TRU-JS 0910), CHINA: Xizang Autonomous Region: Gyirong County, Gyirong Township, Duofu Village (28°24.11'N, 85°17.92'E, 2900 m a.s.l.), 24.V.2025, leg. X.Q. Mi et al.

Paratypes: 1♂ 2♀ (TRU-JS 0911–0913), same data as for holotype; 5♂ 2♀ (TRU-JS 0914–0920), Jifu Village (28°22.34'N, 85°20.37'E, 2750 m a.s.l.), 25.V.2025, leg. X.Q. Mi et al.; 2♂ 4♀ (TRU-JS 0921–0926), Gyirong Township (28°23.48'N, 85°21.14'E, 2900 m a.s.l.), 26.V.2025, leg. X.Q. Mi et al.

Etymology. The species is named after one of the collectors, Mrs Lidi Zhang, noun (name) in genitive case.

Diagnosis. The male of the new species resembles that of Y. flexa Song & Chai, 1992 in having a similar palp, especially the retrolateral tibial apophysis distally curved retrolaterally in ventral view, but can be distinguished by the following aspects: (1) the widest portion of the embolus is about equal to the largest diameter of the visible portion of the sperm duct (Fig. 7B) vs ca. 2/ 3 in Y. flexa (Lin et al. 2023: fig. 23A); and (2) the retrolateral tibial apophysis is acutely narrowed distally in retrolateral view (Fig. 7C) vs almost tapered in Y. flexa (Lin et al. 2023: fig. 23B). The female of this new species somewhat resembles that of Ptocasius filiformus Yang & Peng, 2023 in having a similar epigynal hood, but it can be easily distinguished by the following aspects: (1) the length of the copulatory opening is about double the width of the epigynal hood (Fig. 8A, B) vs almost equal to the width of the epigynal hood in P. filiformus (Yang & Peng 2023: figs 11B, 12D); and (2) the distance between the anterior-most portion of the copulatory opening and the posterior-most edge of the copulatory duct is about 1.5 times of the distance between the epigynal hoods (Fig. 8C) vs about half in P. filiformus (Yang and Peng 2023: figs 11C, 12E).

Description. Male (holotype, Figs 7A–C, 8D, E, G, H). Total length 5.02. Carapace 2.21 long, 1.81 wide. Abdomen 2.91 long, 2.12 wide. Eye sizes and interdistances: AME 0.45, ALE 0.25, PLE 0.21, AERW 1.51, PERW 1.44, EFL 0.98. Legs: I 5.27 (1.60, 0.93, 1.28, 0.88, 0.58), II 4.16 (1.33, 0.73, 0.95, 0.70, 0.45), III 4.64 (1.50, 0.70, 0.98, 0.93, 0.53), IV 4.90 (1.48, 0.68, 1.08, 1.13, 0.53). Carapace setose, red-brown to dark brown, with central yellow stripe; fovea dark red, linear. Chelicerae with typical dentition. Endites pale yellow to yellow, with dense disto-inner marginal setae. Labium dark brown. Sternum dark brown, slightly longer than wide. Legs pale to dark brown, spiny. Dorsum of abdomen mainly dark, spotted, with central, discontinuous yellow stripe gradually widened and pair of posterolateral pale spots; venter grey, spotted, with longitudinal, central brown patch.

Palp (Fig. 7A–C): tibia almost as long as wide; retrolateral tibial apophysis acutely narrowed and curved towards retrolateral side distally, with pointed tip directed towards about 01:30 position in ventral view; cymbium about 1.3 times longer than wide; tegulum slightly swollen posteriorly, with posterior lobe curved prolaterally; embolus tapered, originating from ca. 09:00 position, with pointed end.

Female (TRU-JS 0912, Fig. 8A–C, F). Total length 5.24. Carapace 2.49 long, 1.80 wide. Abdomen 2.90 long, 2.15 wide. Eye sizes and interdistances: AME 0.49, ALE 0.27, PLE 0.23, AERW 1.51, PERW 1.49, EFL 1.02. Legs: I 4.06 (1.23, 0.80, 0.90, 0.65, 0.48), II 3.91 (1.25, 0.75, 0.83, 0.60, 0.48), III 4.71 (1.58, 0.75, 0.88, 1.00, 0.50), IV 5.14 (1.58, 0.75, 1.13, 1.18, 0.50). Habitus (Fig. 8F) similar to that of male, except carapace paler in color and central stripe of thorax broader.

Epigyne (Fig. 8A–C): almost as long as wide, with pair of hoods posterior to copulatory openings; copulatory openings slit-shaped, anteriorly located; copulatory ducts generally L-shaped, with sharp posterior bend, connecting to indistinct spermathecae; fertilization ducts originating from anterior-most portions of spermathecae.

Distribution. Known only from the type locality in Xizang, China (Fig. 9).