Trilacuna xinping 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 : 29-30

Trilacuna xinping Tong, Zhang & Li sp. n. Figs 19, 20, 21, 23 E–G, 25C, D, 26G

Type material.

Holotype ♂ (SYNU-248), China, Yunnan Province, Yuxi City, Xinping County, Ailaoshan Natural Reserve, on the roadside from Jinshan bealock to the Ancient Tea Horse Road, 23°56'967"N, 101°30'270"E, 2283 m, 19.V.2011, Zongxu Li & Guchun Zhou. Paratypes: 5♀ (SYNU-249), same data as holotype.

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 cluster of short setae (css) on posterior part of sternum (Fig. 19E), and the kidney-shaped palpal bulb (Fig. 23E, G), and the females by the absence of the transverse sclerite (tsc) of endogyne (Fig. 25D). T. rastrum males are lacking cluster of short setae on posterior part of sternum, and have pear shaped palpal bulb, and the females have the transverse sclerite ( Tong and Li 2007: figs 6-10).

Description.

Male (Holotype). Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 19 A–C. Body length 1.74; carapace 0.81 long, 0.69 wide; abdomen 0.93 long, 0.64 wide. Carapace sides granulate. Eyes: ALE largest, PME smallest (Fig. 19D, G). ALE separated from edge of carapace by 1.1 diameters. Mouthparts as in Figs 19E, G, 26G. Sternum reticulated, with a cluster of short setae (css) posteriorly (Fig. 19E). Abdomen as in Fig. 19I. 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 a small dark dot (ddo) between anterior and posterior spiracles, surrounded by rows of long setae (rls) (Fig. 19H, I). Palp (Figs 20, 23 E–G): orange. Tip of cymbium with long setae, almost as long as cymbium. Bulb kidney-shaped. Embolus system (Fig. 20B, D, F), with ear-shaped projection at base (bep) and comb-shaped prolateral lobes (csl); with a lateral curved branch (lcb) and broad medial branch (bmb), the former (lcb) with a cluster of lateral “hairs” (lh), the latter (bmb) covered by numerous dorsal “hairs” (dbh).

Female. As in male except as noted. Habitus as in Fig. 21 A–C. Slightly larger than male. Body length 1.91; carapace 0.81 long, 0.74 wide; abdomen 1.16 long, 0.76 wide. Endites unmodified; sternum without cluster of short setae on posterior area; ventral side of abdomen not elevated from lateral view. Genitalia. Ventral view (Fig. 25C): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 25D): with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse sclerite (tsc) absent, transverse bars (tba) strongly arched, with two short, lateral apodemes (ap).

Distribution.

Known only from the type locality.