Trilacuna wenfeng Tong & Li, 2021

Wang, Ying, Tong, Yanfeng, Bian, Dongju & Li, Shuqiang, 2021, Two new species of the genus Trilacuna from Chongqing Municipality, China (Araneae, Oonopidae), Zootaxa 4927 (3), pp. 431-443 : 438-442

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 ).

Figures

FIGURE 2. Trilacuna difeng sp. nov., holotype male (A–D) and Trilacuna wenfeng sp. nov., holotype male (E–H). A–B, E–F. Left male palp (A, E. Prolateral view; B, F. Retrolateral view); C–D, G–H. Distal part of palp (C, G. Prolateral view; D. Retrolateral view; H. Dorsal view). Scale bars: 0.20 (A, B), 0.10 (C, D, E, F, G), 0.05 (H).

FIGURE 5. Trilacuna difeng sp. nov., paratype female (A–B) and Trilacuna wenfeng sp. nov., paratype female (C–D). Copulatory organ (A, C. Ventral view; B, D. Dorsal view). ap = apodeme, as = anterior sclerite, glo = globular structure, psp = posterior spiracle, sar = sclerotized, recurved arches, tba = transverse bar, tsc = transverse sclerite. Scale bars: 0.20 (A, B), 0.10 (C, D).

FIGURE 6. Trilacuna wenfeng sp. nov., holotype male. A, C, E. Habitus (A. Dorsal view; C. Ventral view; E. Lateral view); B, D, F, I. Prosoma (B. Dorsal view; D. Ventral view; F. Lateral view; I. Anterior view); G, H. Abdomen (G. Ventral view, arrow shows the cluster of short setae; H. Lateral view). ehb = elevated hair base, ldi = labium deep incision. Scale bars: 0.40 (A–I).

FIGURE 7. Trilacuna wenfeng sp. nov., holotype male, SEM. A–B. Left palp (A. Prolateral view; B. Retrolateral view); C–D, G. Palpal bulb (C. Prolateral view; D. Retrolateral view; G. Dorsal view); E–F, H. Distal part of palpal bulb (E. Prolateral view; F. Retrolateral view; H. Dorsal view). blp = basal leaf-shaped projection, lb = lateral branch, mb = median branch, vbl = ventral broad lobes.

FIGURE 8. Trilacuna wenfeng sp. nov., paratype female. A, C, E. Habitus (A. Dorsal view; C. Ventral view; E. Lateral view); B, D, F, I. Prosoma (B. Dorsal view; D. Ventral view; F. Lateral view; I. Anterior view); G, H. Abdomen (G. Ventral view; H. Lateral view). ehb = elevated hair base, ldi = labium deep incision. Scale bars: 0.40 (A–I).

FIGURE 9. Distribution records of the species of Trilacuna from China. 1. T. angularis Tong & Li, 2007; 2. T. bawan Tong, Zhang & Li, 2019; 3. T. cuneata Tong, 2019; 4. T. datang Tong, Zhang & Li, 2019; 5. T. difeng sp. nov.; 6. T. fugong Tong, Zhang & Li, 2019; 7. T. gongshan Tong, Zhang & Li, 2019; 8. T. longling Tong, Zhang & Li, 2019; 9. T. rastrum Tong & Li, 2007; 10. T. simianshan Tong & Li, 2018; 11. T. songyuae Tong & Li, 2018; 12. T. wenfeng sp. nov.; 13. T. wuhe Tong, Zhang & Li, 2019; 14. T. xinping Tong, Zhang & Li, 2019.