Trilacuna wenfeng Wang & Tong & Bian & Li 2021, sp. nov.

Trilacuna wenfeng Tong & Li, sp. nov.

Figs 2 E–H, 5C–D, 6–9

Type material. Holotype: Male (SYNU-274), Wenfeng Mountain (31º4'10.134''N, 109º55'6.654''E, elevation 761 m), Wushan County, Chongqing Municipality, China, 25 October 2014, S. Lyu and Y. Tong leg. Paratypes: 1 male (SYNU-275) and 4 females (SYNU-276–279), same data as holotype. Other materials examined: 6 males (SYNU-280–285) and 5 females (SYNU-286–290), same data as holotype.

Etymology. The specific name is a noun in apposition from the type locality.

Diagnosis. This new species is similar to Trilacuna longling Tong, Zhang & Li, 2019, but males can be distinguished by the strongly elevated epigastric region and the cluster of densely short setae on epigastric region (Fig. 6G, H) and females by absence of the transversally elongated sclerite of endogyne (Fig. 5D). T. longling males have flat epigastric region and without cluster of densely short setae on epigastric region, and females have a transversally elongated sclerite of endogyne (Tong et al. 2019: figs 13H, I, 24J).

Description. Male (holotype, SYNU-274). Body yellow, chelicerae and sternum lighter. Habitus as in Fig. 6A, C, E. Body length 1.44; carapace 0.67 long, 0.57 wide; abdomen 0.77 long, 0.50 wide. Carapace sides granulate; lateral margin rebordered. Six eyes, well developed, arranged in a compact group; ALE largest, PLE smallest; ALE- PLE separated by less than ALE radius, PME touching each other; posterior row recurved from above, procurved from front (Fig. 6B, I). Clypeus sinuous in frontal view, anterior lateral eyes separated from edge of carapace by about 1.1 times their diameter. Mouthparts: chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised (Fig. 6D); endites slender, distally not branched (Fig. 6D). Sternum with radial furrows between coxae I-II, II-III, III-IV; surface smooth (Fig. 6D). Abdomen (Fig. 6G, H): booklung covers ovoid, surface smooth; apodemes present, posterior spiracles not connected; epigastric region strongly elevated, with a cluster of densely short setae. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Palp (Figs 2 E–H, 7): orange; 0.46 long (0.15, 0.09, 0.08, 0.14); femur greatly elongated (width/length = 0.57); bulb kidney-shaped, tapering apically; embolus system (Fig. 7E, F, H) with a leaf-shaped projection on base (blp) in prolateral view, a median branch (mb) in dorsal view, and a lateral long curved branch (lb) in retrolateral view.

Female (SYNU-276): Same as male except as noted. Habitus as in Fig. 8A, C, E; slightly larger than male. Body length 1.46, carapace 0.67 long, 0.57 wide, abdomen 0.89 long, 0.53 wide. Endites unmodified. Epigastric area (Figs 5C, 8G): surface without external features. Endogyne (Fig. 5D): with an anterior stick-shaped sclerite (as), and a posterior small globular structure (glo); transverse bar (tba) with two lateral apodemes (ap).

Distribution. Known only from the type locality (Fig. 9).