Trilacuna datang 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 : 15-19

Trilacuna datang Tong, Zhang & Li sp. n. Figs 4, 5, 6, 22C, F, 24C, D, 26B

Type material.

Holotype ♂ (SYNU-240), China, Yunnan Province, Baoshan City, Tengchong County, Jietou Town, Datang Village, Dahelingganjiao, 23.II.2011, Zongxu Li & Luyu Wang. Paratypes: 6♀, 1♂ (SYNU-241), same data as holotype; 1♂, 3♀ (SYNU-242), same locality as holotype, 21.II.2011; 1♂ (SYNU-243), same locality as holotype, 24.II.2011.

Etymology.

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

Diagnosis.

The new species is similar to T. rastrum Tong & Li, 2007, but males can be distinguished by the strongly elevated epigastric region (Fig. 4I), the long, very thick setae (lts) between the anterior spiracles (Fig. 4H) and 2 basal broad blade-like lobes (bll) and one long distal broad lobe (dbl) of embolus system (Fig. 5B), and the females by the smooth carapace and rugose surface of the sternum. Trilacuna rastrum males have flat epigastric region, without thick setae between the anterior spiracles, and have rake-like lobes of embolus system, and females have granulated sides of carapace and pitted surface of the sternum.

Description.

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 4 A–C. Body length 1.87; carapace 0.89 long, 0.76 wide; ab domen 0.99 long, 0.72 wide. Carapace sides smooth, lateral margin rebordered (Fig. 4D). Eyes similar to those of T. bawan sp. n. (Fig. 4D, G). ALE separated from edge of carapace by 1.3 diameters. Mouthparts (Figs 4E, G, 26B) similar to those of T. bawan sp. n. Sternum surface smooth, with many short, italic thick setae (sis) on middle area (Fig. 4E). Abdomen as in Fig. 4I. 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 in front of anterior spiracles; with four long, very thick setae (lts) between the anterior spira cles; with a small hole (slh) between the posterior spiracles (Fig. 4H); epigastric region strongly elevated (Fig. 4I) in lateral view. Palp (Figs 5, 22C, F): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 22C, F). Tip of cymbium with long setae, longer than cymbium. Bulb oval, stout, tapering apically. Embolus system (Fig. 5B, D, F) with 2 basal broad blade-like lobes (bll) and one long distal broad lobe (dbl) prolaterally, the tip of the distal lobe sharply bending (dbe); with a lateral curved branch (lcb) and a long medial branch (lmb) dorsally; with numerous brush of “hairs” (dbh) on dorsal branch and lateral “hairs” (lh) on small branches derived from the lateral curved branch (lcb).

Female. As in male except as noted. Habitus as in Fig. 6 A–C. Body length 1.87; carapace 0.85 long, 0.74 wide; abdomen 1.09 long, 0.81 wide. Endites unmodified; sternum surface strongly rugose; ventral side of abdomen unmodified. Genitalia. Ventral view (Fig. 24C): with recurved, strongly sclerotized arches (sar) anterior to the spiracles; grooves connected posterior spiracles heavily sclerotized. Dorsal view (Fig. 24D): with narrow, transversally elongated sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) slightly arched, with two short, lateral apodemes (ap).

Distribution.

Known only from the type locality.