Bioacoustics of Latouchia yinggen

Description. Male ( holotype , Figs 2 D , 3 D ). Carapace yellowish brown. Cephalic region smoothly elevated. Eight eyes in two rows: anterior row procurved, posterior row straight. Chelicerae black-brown, without stridulatory ridges, promargin with seven teeth, retromargin with five teeth. Fovea procurved and deep. Sternum yellowish brown with glabrous sigilla. Labium and maxillae yellowish brown, two maxillae together bearing approximately 37 cuspules along proximal edge (Fig. 3 D ). Opisthosoma pale yellow. Measurements: BL 11.98, CL 5.27, CW 4.66, OL 5.30, OW 3.85; Eye group, EL 0.51, AR 0.84, PR 0.89, AME - AME 0.10, AME 0.18, PME - PME 0.32, PME 0.13, ALE 0.27, PLE 0.25; MaxL 1.80, LL 0.75, LW 0.95; SL 3.15, SW 2.79; leg I and II missing, leg III 14.91 (4.01, 2.22, 2.55, 3.97, 2.16), leg IV 21.16 (5.52, 2.48, 4.63, 5.80, 2.73). Palp. Palpal bulb simple and elliptic in retrolateral view; embolus slightly thickened at base, tapering toward apex and curved at one-third of its length from tip; apex with triangular apophysis in retrolateral view, with both prolateral and retrolateral superior keels present (Fig. 8 A – F ). Female ( LH-2017-182 , Figs 2 J , 3 J ). Carapace yellowish brown. Cephalic region elevated. Eight eyes in two rows: anterior row procurved, posterior row straight. Chelicerae concolorous with carapace, without stridulatory ridges, promargin with six teeth, retromargin with five teeth. Fovea procurved and deep. Sternum yellow with indistinct sigilla. Labium and maxillae yellow, two maxillae with 31 cuspules along proximal edge (Fig. 3 J ). Opisthosoma yellowish brown with regular light blotches. Measurements: BL 10.48, CL 4.65, CW 3.80, OL 4.84, OW 3.31; Eye group, EL 0.45, AR 0.79, PR 0.81, AME - AME 0.11, AME 0.13, PME - PME 0.26, PME 0.11, ALE 0.26, PLE 0.22; MaxL 1.64, LL 0.73, LW 0.87; SL 2.66, SW 2.37; palp 7.25 (2.51, 1.48, 1.59, 1.67), leg I 9.17 (2.95, 1.82, 1.98, 1.29, 1.13), leg II 8.24 (2.60, 1.63, 1.39, 1.41, 1.21), leg III 7.81 (2.35, 1.57, 1.09, 1.45, 1.35), leg IV 11.04 (3.19, 1.86, 2.17, 2.32, 1.50). Vulva. Spermathecae paired and parallel, with distinct subcentral constriction; spherical lobes densely covered with glandular pores; stalks tapering in distal half (Fig. 8 G, H ).

Diagnosis. This species differs from L. jihe sp. nov. , L. davidi , L. pavlovi , and L. stridulans by absence of stridulatory ridges on the chelicerae in both sexes. Male of L. yinggen sp. nov. can be distinguished from that of L. linmufu by embolus curved at one-third of its length from apex (Fig. 8 D, E vs fig. 7 G – J in Hao et al. 2025 ); from L. calcicola by lacking elevated embolic keel with slightly serrated edge in retrolateral view (Fig. 8 C, F vs fig. 3 A in Hao et al. 2025 ). Females of L. yinggen sp. nov. differ from those of L. calcicola and L. linmufu by parallel spermathecae with spherical lobes (Fig. 8 G, H vs figs 2 I, 7 K in Hao et al. 2025 ). In addition, the new species differs from L. calcicola in both male and female by lacking band of spinules on ventro-posterior angle of coxae I – III (fig. 2 C, D in Hao et al. 2025 )