Sinahahnia chengkou Cai, Wang & Zhang 2025, sp. nov.

Sinahahnia chengkou Cai, Wang & Zhang sp. nov. Figs 3 A – E, 4 A – G Type material. Holotype • ♂ (SWUC-T-HA-17-01), China, Chongqing Munic., Chengkou Co., Daba MNNR, Longtian Town, Wuli Vill., 32°04.269'N, 108°39.914'E, elev. 1286 m, 16. 03. 2018, Z. S. Zhang et al. leg. Paratypes • 2 ♂ 9 ♀ (SWUC-T-HA-17-02 ~ 12), same data as holotype • 1 ♂ (SWUC-T-HA-17-13), Wuli Vill., 32°03.726'N, 108°40.351'E, elev. 1206 m, 16. 03. 2018, Z. S. Zhang et al. leg. • 1 ♂ 2 ♀ (SWUC-T-HA-17-14 ~ 16), Wuli Vill., 32°04.443'N, 108°39.278'E, elev. 1264 m, 16. 09. 2012, L. Y. Wang, X. K. Jiang leg. • 2 ♀ (SWUC-T-HA-17-17 ~ 18), Xiuqi Town, Xumu Vill., 31°54.484'N, 109°03.556'E, elev. 1670 m, 27. 03. 2013, X. K. Jiang and X. W. Meng leg. Etymology. The specific name is derived from the type locality; noun in apposition. Diagnosis. The new species resembles S. eyu (Wang and Zhang 2024: 251, figs 2, 3 C – G, 4 B, C) in having a bifurcated patellar apophysis, long, slender embolus, large, membranous median apophysis, and long, spiral copulatory ducts, but differs from the latter by the curved retrolateral tibial apophysis (vs twisted with small thorns), the finger-shaped retrolateral patellar apophysis (vs absent; Figs 3 A – C, 4 C – E), and cordate spermathecae (vs reniform; Figs 3 E, 4 G). Description. Male holotype (Fig. 4 A) total length 2.15. Prosoma 1.01 long, 0.80 wide; opisthosoma 1.18 long, 0.84 wide. Carapace yellowish brown. Fovea longitudinal. Eye sizes and interdistances: AME 0.02, ALE 0.07, PME 0.07, PLE 0.09; AME – AME 0.02, AME – ALE 0.01, PME – PME 0.04, PME – PLE 0.02, ALE – PLE 0.01. MOA 0.16 long, front width 0.06, back width 0.19. Clypeus height 0.12. Chelicerae yellowish brown, with 2 promarginal and 4 retromarginal teeth. Endites yellowish brown. Labium yellowish brown. Sternum yellowish brown. Leg measurements: I 2.85 (0.81, 0.91, 0.60, 0.53); II 2.61 (0.77, 0.83, 0.53, 0.48); III 2.08 (0.70, 0.49, 0.44, 0.45); IV 3.07 (0.89, 0.93, 0.72, 0.53). Opisthosoma oval, dorsum yellowish brown, dorsally with 6 light chevrons, venter yellowish brown. Palp (Figs 3 A – C, 4 C – E). Femur unmodified. Patella with 2 apophyses - proximal and distal: proximal one (PA) curved, short, with 2 tips, one of them twice larger than other; distal apophysis (DPA) finger-shaped. Tibia slightly shorter than patella, with 2 apophyses: retrolateral apophysis (RTA) curved retrolaterally, with intumescent base and spine-like tip; lateral apophysis (LTA) with blunt end, slightly wider than tall in dorsal view. Cymbial furrow (CF) almost as long as cymbium. Tegulum longer than wide. Embolus with wide embolic base, originating at 6 - o’clock position, silk-like, curved clockwise (in left palp) as whole circle, its tip staying inside of cymbial furrow near embolic base. Distal part of median apophysis (MA) almost 7 times wider than its base; sperm duct distinct in tegulum and embolic base, curved inside of embolic base. Female paratypes total length 2.00–2.47. Paratype (SWUC-T-HA-09-02, Fig. 4 B) total length 2.13. Prosoma 0.87 long, 0.63 wide; opisthosoma 1.26 long, 0.95 wide. Carapace yellowish brown. Eye sizes and interdistances: AME 0.03, ALE 0.07, PME 0.07, PLE 0.08; AME – AME 0.02, AME – ALE 0.01, PME – PME 0.05, PME – PLE 0.02, ALE – PLE 0.01. MOA 0.14 long, front width 0.07, back width 0.18. Clypeus height 0.08. Leg measurements: I 11.38 (3.09, 4.21, 2.50, 1.58); II 10.85 (3.04, 3.83, 2.43, 1.55); III 11.19 (2.95, 3.62, 3.09, 1.53); IV 16.17 (3.90, 5.11, 5.10, 2.06). Epigyne (Figs 3 D – E, 4 F – G). Plate as long as wide; copulatory opening (CO) small located slightly mid-anteriorly; copulatory duct (CD) thin, long, wrapped 3 times around secondary spermathecae (Ss); secondary spermatheca small, located anteriorly; spermatheca (Sp) about 1.5 times longer than wide, folded in half, as large as secondary spermatheca, with a small protuberance antero-laterally (Spp); spermathecae spaced slightly wider by one width, but narrower than the length of it. Variation. Males (N = 5) total length 2.08–2.22, females (N = 13) total length 2.00–2.47. Distribution. Known only from the type locality in Chongqing, China.