Trilacuna yunmeng Ma & Tong 2024, sp. nov.

Trilacuna yunmeng Ma & Tong sp. nov. Figs 6 F, 9, 10 Material examined. Holotype: China • ♂ (SYNU-1180); Hebei Province, Baoding City, Yi County, Yunmeng Mountain; 39°23'52"N, 115°16'17"E; 11. VI. 2012; F. Zhang leg. Etymology. The specific name is a noun in apposition taken from the type locality. Diagnosis. The new species is similar to Trilacuna hansanensis Seo, 2017, but can be distinguished by the many ridges on posterior area of sternum (Fig. 9 E), vs a pair of ridges (Seo 2017: fig. 1 B), and the steeply elevated epigastric region (Fig. 9 H) vs flat (Seo 2017: fig. 1 B). Description. Male (Holotype). Body: yellow, legs lighter; habitus as in Fig. 9 A – C; body length 1.57. Carapace: 0.67 long, 0.57 wide; sides granulate, lateral margin rebordered (Fig. 9 D). Eyes: nearly equal sized; posterior eye row recurved from above, procurved from front; ALE separated from edge of carapace by 1.3 diameters (Fig. 9 D, G). Mouthparts: chelicerae straight; labium rectangular, anterior margin deeply incised; endites slender, distally branched (Figs 6 F, 9 G). Sternum: surface finely smooth, with many ridges on posterior area (Fig. 9 E). Abdomen: 0.84 long, 0.57 wide; booklung covers ovoid, surface smooth; sperm pore situated at level of anterior spiracles; apodemes present, posterior spiracles not connected by groove; epigastric region steeply elevated (Fig. 9 C). Leg spination: legs I – II: tibia: v 2-2 - 2 - 2 - 0, metatarsus: v 2-2 - 0. Palp: orange; 0.50 long (0.14, 0.11, 0.11, 0.14); femur elongated (width / length = 0.62); bulb triangular, basally strongly bulged; embolus system with ear-shaped projection (bep) at base, with a lateral curved branch (lcb) and narrow medial branch (mb) (Fig. 10 A – L). Female. Unknown. Distribution. Known only from the type locality (Fig. 11).