Trilacuna wumanshan Tong, Yang & Zhang, 2023

Ma, Jimeng, Bian, Dongju, Tong, Yanfeng, Yang, Zizhong & Zhang, Zhisheng, 2023, Three new species of the genus Trilacuna Tong & Li, 2007 (Araneae, Oonopidae) from Yunnan Province, China, ZooKeys 1174, pp. 289-300 : 289

Trilacuna wumanshan Tong, Yang & Zhang sp. nov.

Figs 3 , 4 , 8

Type material.

Holotype ♂ (SYNU-661): China, Yunnan Province, Lincang City, Cangyuan Wa Autonomous County, Banhong township, Wuman Hill, 23°15′15″N, 99°05′52″E, Z. Yang leg., 13/5/2021.

Diagnosis.

The new species is similar to T. longtankou Tong & Li, 2020 in the shape of the male palp, but it can be distinguished by the smooth sternum (Fig. 3B ) vs sternum with two rows of paddle-shaped setae, and the large dorsal prong and the narrow lateral and dorsal branches of psembolus (Fig. 4J, K ) vs a basal branch and several broad branches of psembolus ( Huang et al. 2020: fig. 3E, F, H).

Description.

Male (holotype). Body: yellow-brown, chelicerae and sternum lighter, legs yellow; habitus as in Fig. 3A-C ; body length 1.44. Carapace: 0.70 long, 0.56 wide; sides smooth, lateral margin rebordered (Fig. 3D ). Eyes: ALE largest, PME smallest; ALE separated from edge of carapace by 1.0 diameters (Fig. 3D, F ). Mouthparts: chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised; endites slender, distally not branched (Fig. 3E, G, H ). Sternum: surface finely smooth (Fig. 3E ). Abdomen: 0.72 long, 0.47 wide; booklung covers ovoid, surface smooth; dorsal scutum not fused to epigastric scutum; sperm pore situated at level of posterior spiracles; apodemes present, posterior spiracles not connected by groove; epigastric region slightly elevated (Fig. 3A-C ). Palp: orange; 0.54 long (0.16, 0.09, 0.12, 0.17); femur greatly elongated (width/length = 0.60); bulb triangle, tapering anteriorly; psembolus with large dorsal prong (ldp), a cluster of basal short “hairs” (bsh), and a small ventral projection (vp); with a broad median branch (mb), a narrow lateral branch (lb) and a dorsal branch (db) (Fig. 4 ).

Female. Unknown.

Etymology.

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

Distribution.

Known only from the type locality, Yunnan Province, China (Fig. 8 ).

Figures

Figure 3. Trilacuna wumanshan sp. nov., male holotype A-C habitus in dorsal, ventral, and lateral views, arrow shows the elevated epigastric region D-F prosoma in dorsal, ventral, and anterior views G labium and endites in ventral view H chelicerae in slightly oblique lateral view. Abbreviations: ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm (A-F); 0.2 mm (G, H).

Figure 4. Trilacuna wumanshan sp. nov., left male palp, A-F (light) and G-L (SEM) A, G prolateral view B, H dorsal view C, I retrolateral view D, J distal part of bulb, prolateral view E, K distal part of bulb, dorsal view F, L distal part of bulb, retrolateral view. Abbreviations: bsh = basal short " hairs "; db = dorsal branch; lb = lateral branch; ldp = large dorsal prong; mb = median branch; vp = ventral projection. Scale bars: 0.1 mm (A-C, G-I); 0.05 mm (D-F, J-L).

Figure 8. Distribution records of three new species from Yunnan, China. 1. Trilacuna cangshan sp. nov.; 2. Trilacuna wumanshan sp. nov.; 3. Trilacuna xiaoheishan sp. nov.