Trilacuna gongshan 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 : 20-22

Trilacuna gongshan Tong, Zhang & Li sp. n. Figs 10, 11, 12, 23A, B, 24G, H, 26D

Type material.

Holotype ♂ (SYNU-257), China, Yunnan Province, Nujiang Lisu Autonomous Prefecture, Gongshan County, Bingzhongluo Town, 28°00'866"N, 98°35'953"E, 1840 m, 11.III.2011, Zongxu Li & Guchun Zhou. Paratypes: 6♀, 4♂ (SYNU-258), same data as holotype; 2♀, 1♂ (SYNU-259), same locality as holotype, 8.III.2011, Zongxu Li & Luyu Wang.

Etymology.

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

Diagnosis.

The new specie is similar to T. rastrum Tong & Li, 2007, but can be distinguished by the presence of three pairs of spines on male tibiae I and II, the leaf-shaped projection (blp) and three long, tooth-like lobes (tll) on the embolus system (Fig. 11B, D), and the several longitudinal wrinkles on sternum surface of female. Trilacuna rastrum has four pairs of ventral spines on male tibiae I and II, lacking the leaf-shaped projection, has a rake-shaped lobes on the embolus system, and has a pitted surface on sternum of female ( Tong and Li 2007: fig. 7-10).

Description.

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 10 A–C. Body length 1.89; carapace 0.88 long, 0.74 wide; abdomen 1.08 long, 0.68 wide. Carapace sides granulate, lateral margin rebordered (Fig. 10D). Eyes: ALE separated from edge of carapace by 1.4 diameters (Fig. 10D, G). Mouthparts (Figs 10E, G, 26D) similar to those of T. bawan sp. n. Sternum surface smooth, with finely setae (Fig. 10E). Abdomen as in Fig. 10I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated at level of anterior spiracles; with a small hole (slh) between the posterior spiracles (Fig. 10H). Palp (Figs 11, 23A, B): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 23A, B). Cymbium without long seta. Bulb oval, stout, tapering apically. Embolus system (Fig. 11B, D, F) with a leaf-shaped projection (blp) and three long, tooth-like lobes (tll) prolaterally; with a lateral curved branch (lcb) and a long medial branch (lmb) dorsally; with numerous brush of “hairs” (dbh) surrounded medial branch and lateral “hairs” (lh) on lateral curved branch (lcb).

Female. As in male except as noted. Habitus as in Fig. 12 A–C. Slightly larger than male. Body length 1.92; carapace 0.81 long, 0.72 wide; abdomen 1.18 long, 0.72 wide. Endites unmodified; sternum surface smooth, but medially with several longitudinal wrinkles. Genitalia. Ventral view (Fig. 24G): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 24H): with narrow, transversally elongated sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) straight, with two short, lateral apodemes (ap).

Distribution.

Known only from the type locality.