Trilacuna mainling Tong & Li 2025, sp. nov.

Trilacuna mainling Tong & Li sp. nov. Figs 5 A – H, 6, 7, 14 A, B Material examined. Holotype China • ♂ (SYNU -914); Xizang, N of Mainling Co.; 29°13.310'N, 94°13.309'E, 3050 m elev.; 13. VIII. 2013; Q. Cao leg. Paratype. China • 1 ♀ (SYNU -915); same data as holotype. Etymology. The specific name is a noun in apposition taken from the type locality. Diagnosis. The new species is similar to T. bangla in the shape of the bulb but can be distinguished by the male epigastric region with a small wedge-shaped process (Fig. 5 D, arrow) vs. lacking, but with a row of enlarged setae (Fig. 2 G, arrow); the psembolus with serrated structure at the base (Fig. 6 M, arrow) vs. lacking, instead of cluster of fibers (Fig. 3 I); the reticulated abdominal scutum of the female (Fig. 7 A, C, E) vs. smooth (Fig. 4 A, C, E); and the very small globular structure of the endogyne (Fig. 14 B) vs. very large (Fig. 14 F). Description. Male. Body: yellow, legs lighter; habitus as in Fig. 5 A – F; body length 1.59. Carapace (Fig. 5 A, E): 0.87 long, 0.72 wide; sides granulate. Eyes (Fig. 5 A, G): well developed; ALE separated from edge of carapace by one diameter. Mouthparts (Fig. 5 C, G, H): endites slender, distally not branched. Sternum (Fig. 5 C): surface reticulated. Abdomen: 0.63 long, 0.48 wide; sperm pore situated at level of anterior spiracles; apodemes present, posterior spiracles connected by groove; with small wedge-shaped process situated between anterior and posterior spiracles; epigastric region slightly elevated (Fig. 5 D, F). Palp (Fig. 6 A – N): orange; 0.68 long (0.21, 0.12, 0.11, 0.24); femur not enlarged (width / length = 0.46); bulb triangle; psembolus with several rows of serrated structure at base, psembolus proper surrounded by numerous fiber structures. Female (paratype, SYNU -915). As in male except as noted. Body: habitus as in Fig. 7 A, C, E; body length 2.19. Carapace: 0.97 long, 0.79 wide; Abdomen: 1.37 long, 0.74 wide; dorsal and ventral scutum surface reticulated. Epigastric area (Figs 7 G, 14 A): with recurved, strongly sclerotized arches (sar). Endogyne (Fig. 14 B): with narrow, transverse sclerite (tsc); with anterior large T-shaped sclerite (as) and posterior small globular structure (glo); transverse bars (tba) with pair of lateral apodemes (ap). Distribution. Known only from the type locality (Fig. 1).