Trilacuna bawan Tong, Zhang & Li

Tong, Yanfeng, Chen, Haifeng, Bai, Shuchong, Zhang, Zhisheng & Li, Shuqiang, 2019, Seven new species of the genus Trilacuna Tong & Li, 2007 from Yunnan, China (Araneae, Oonopidae), ZooKeys 821, pp. 11-44 : 13-15

Trilacuna bawan Tong, Zhang & Li sp. n. Figs 1, 2, 3, 22A, B, 24A, B, 26A

Type material.

Holotype ♂ (SYNU-254), China, Yunnan Province, Baoshan City, Bawan Town, Dasheyao, 13.II.2011, Zongxu Li & Luyu Wang. Paratypes: 3♀ (SYNU-252), same data as holotype; 1♂ (SYNU-253), same locality as holotype, 14.II.2011.

Etymology.

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

Diagnosis.

Males of the new species is similar to T. hansanensis Seo, 2017, but can be distinguished by the following characters: sternum with grooves (gro) on posterior area (Fig. 1E); epigastric region strongly elevated, then followed by a narrow, slightly median elevation (mel) (Fig. 1I); embolus system with a leaf-shaped projection on basal part (blp) (Fig. 2B, D). T. hansanensis has a pair of chitinized ridges on posterior area of sternum ( Seo 2017: fig. 1B), epigastric region and ventral surface of abdomen not elevated ( Seo 2017: fig. 1B), and has a strongly bent terminal hook on basal part of bulb ( Seo 2017: fig. 1K). Females of the new species are similar to those of T. songyuae Tong & Li, 2018, but can be distinguished by the absence of the large dark knob marking in ventral surface of genital area ( Tong et al. 2018: fig. 10H).

Description.

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 1 A–C. Body length 1.76; carapace 0.88 long, 0.74 wide; abdomen 0.97 long, 0.64 wide. Carapace sides granulate; lateral margin rebordered (Fig. 1D). Six eyes, well developed, nearly equal sized, arranged in a compact group; ALE–PLE separated by less than ALE radius, PME touching each other; posterior row recurved from above, procurved from front (Fig. 1D, G). ALE separated from edge of carapace by 1.1 diameters. Mouthparts (Figs 1E, G, 26A): chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised (ldi); endites slender, distally only slightly branched (sdb). Sternum surface smooth, with several grooves (gro) on posterior area (Fig. 1E). Abdomen as in Fig. 1I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated at level of anterior spiracles; with several wrinkles (wri) between the posterior spiracles (Fig. 1H); epigastric region strongly elevated in lateral view, then followed by a narrow, slightly median elevation (mel) (Fig. 1I). Palp (Figs 2, 22A, B): orange. 0.46 long (0.19, 0.11, 0.12, 0.17). Femur 0.19 long, 0.13 wide (width/length = 0.68) (Fig. 22A, B). Tip of cymbium with long setae, almost as long as cymbium. Bulb oval, stout, tapering apically. Embolus system (Fig. 2B, D, F) with a leaf-shaped projection on base (blp) prolaterally; with a long medial branch (lmb) and a lateral curved branch (lcb) dorsally; all these structures surrounded by numerous hair-like structures.

Female. As in male except as noted. Habitus as in Fig. 3 A–C. Slightly larger than male. Body length 1.89; carapace 0.85 long, 0.75 wide; abdomen 1.12 long, 0.73 wide. Endites unmodified; sternum without grooves on middle area; ventral side of abdomen unmodified. Genitalia. Ventral view (Figs 3G, 24A): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 24B): with narrow, transverse sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) nearly straight, with two short, lateral apodemes (ap).

Distribution.

Known only from the type locality.