Trilacuna taoyuanyu Ma & Tong, 2024

Ma, Jimeng, Chen, Qiang & Tong, Yanfeng, 2024, Four new species of the genus Trilacuna Tong & Li, 2007 (Araneae, Oonopidae) from China, ZooKeys 1219, pp. 331-346 : 331-346

Trilacuna taoyuanyu Ma & Tong sp. nov.

Figs 6 E , 7 , 8

Material examined.

Holotype: China • ♂ ( SYNU-1178 ); Fujian Province, Wuyishan City, Wuyi Mountain Scenic Area, Taoyuanyu ; 27°39'15"N, 117°56'54"E; 9. VI. 2013; C. Jin leg.

Etymology.

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

Diagnosis.

The new species is similar to Trilacuna bawan Tong, Zhang & Li, 2019 , but can be distinguished by the strongly elevated epigastric region and two strong setae on it (Fig. 7 H, I ), vs slightly elevated, without strong setae ( Tong et al. 2019: fig. 1 H, I), and the kidney-shaped palpal bulb (Fig. 8 A, C ) vs oval, with deeply constriction on distal region ( Tong et al. 2019: figs 2 A, B, 22 A, B).

Description.

Male (Holotype). Body: reddish brown, chelicerae and sternum lighter, legs yellow; habitus as in Fig. 7 A – C ; body length 1.71. Carapace: 0.79 long, 0.63 wide; sides granulate, lateral margin rebordered (Fig. 7 D ). Eyes: ALE largest, PLE and PME nearly equal sized; posterior eye row recurved from above, procurved from front; ALE separated from edge of carapace by 1.4 diameters (Fig. 7 D, G ). Mouthparts: chelicerae straight; labium rectangular, anterior margin deeply incised; endites slender, distally branched (Figs 6 E , 7 E ). Sternum: surface rugose, with several ridges on posterior area (Fig. 7 E ). Abdomen: 0.92 long, 0.56 wide; booklung covers ovoid, surface smooth; sperm pore situated at level of anterior spiracles; apodemes present, posterior spiracles connected by groove; epigastric region strongly elevated, with 2 very long, strong setae (Fig. 7 H, I ). Leg spination: legs I-II: tibia: v 2-2 - 2 - 2 - 0, metatarsus: v 2-2 - 0. Palp: orange; 0.54 long (0.19, 0.11, 0.09, 0.15); femur elongated (width / length = 0.59); bulb kidney-shaped, basally slightly bulged; embolus system with ear-shaped projection (bep) at base, with a lateral curved branch (lcb) and narrow medial branch (mb) (Fig. 8 A – L ).

Female. Unknown.

Distribution.

Known only from the type locality (Fig. 11 ).

Figures

Figure 6. Trilacuna qingliangfeng sp. nov., female paratype (A, B), Trilacuna guangwu sp. nov., male holotype (C), Trilacuna qingliangfeng sp. nov., male holotype (D), Trilacuna taoyuanyu sp. nov., male holotype (E), Trilacuna yunmeng sp. nov., male holotype (F) A, B copulatory organ in ventral and dorsal views C – F endites in ventral view. Abbreviations: ap = apodemes; as = anterior sclerite; glo = globular structure; mr = membranous region; psp = posterior spiracle; sar = sclerotized, recurved arches; sdb = slightly curved distal branch; tsc = transverse bars. Scale bars: 0.4 mm (A, B); 0.2 mm (C – F).

Figure 7. Trilacuna taoyuanyu sp. nov., male holotype A – C habitus in dorsal, ventral, and lateral views D – G prosoma in dorsal, ventral, lateral and anterior views, white arrow shows the small ridges H – I abdomen, ventral and lateral views, arrow in H shows the strong setae, and arrow in I shows the strong elevated epigastric region. Scale bars: 0.4 mm (A – I).

Figure 8. Trilacuna taoyuanyu 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 palpal bulb, prolateral view E, K distal part of palpal bulb, dorsal view F, L distal part of palpal bulb, retrolateral view. Abbreviations: bep = basal ear-shaped projection; lcb = lateral curved branch; mb = medial branch. Scale bars: 0.1 mm (A – C, G – I); 0.05 mm (D – F, J – L).

Figure 11. Distribution records of four new species from China. 1 = Trilacuna guangwu sp. nov.; 2 = Trilacuna qingliangfeng sp. nov.; 3 = Trilacuna taoyuanyu sp. nov.; 4 = Trilacuna yunmeng sp. nov.