Xizangiana namchabarwa Liu & Zhang, 2023

Liu, Bo, Wang, Luyu & Zhang, Feng, 2023, Revision of the genus Xizangiana Sherwood, Li & Zhang, 2022, with descriptions of five new species (Araneae: Gnaphosidae), Zootaxa 5346 (4), pp. 443-468 : 451-454

publication ID	https://doi.org/ 10.11646/zootaxa.5346.4.5
publication LSID	lsid:zoobank.org:pub:E4FD4F32-49FF-4E81-A9B8-AD9F0361DC69
DOI	https://doi.org/10.5281/zenodo.8407524
persistent identifier	https://treatment.plazi.org/id/803A87D0-0668-8D23-FF01-BFADFD332848
treatment provided by	Plazi
scientific name	Xizangiana namchabarwa Liu & Zhang
status	sp. nov.

Treatment

Xizangiana namchabarwa Liu & Zhang , sp. n.

(NJḇƃffiqǥ)

Figs 1A View FIGURE 1 , 2C–D View FIGURE 2 , 3C View FIGURE 3 , 6C–D View FIGURE 6 , 7–8 View FIGURE 7 View FIGURE 8

Type material. Holotype ♁ (MHBU-ARA- 2022-26-1), CHINA: Xizang Autonomous Region, Linzhi City , Mainling County, Pai Town , 29.511514°N, 94.879380°E, 2945 m elev., 3 June 2022, leg. Bo Liu. GoogleMaps Paratype: 3♀ (MHBU-ARA- 2022-26-2 to 4), same data as holotype GoogleMaps ; 1♀ (MHBU-ARA- 2022-24-1), CHINA: Xizang Autonomous Region, Linzhi City, Bayi District , Lulang Town , 30.003218°N, 94.900765°E, 2326 m elev., 2 June 2022, leg. Bo Liu GoogleMaps ; 11♀ (MHBU-ARA-005586 to 5596), CHINA: Xizang Autonomous Region, Linzhi City , Lang County, 20 August 2002, leg. Minshen Zhu & Feng Zhang.

Etymology. The species name comes from “Namchabarwa”, the highest mountain peak in the easternmost area of the Himalaya, which is shrouded in mist all year round and difficult to see the peak, referring to both the type locality, which is at the foot of the Namchabarwa, and to the membranous projection that is hard to see ( Fig. 3C View FIGURE 3 ); noun in apposition.

Diagnosis. This new species resembles X. linzhiensis in genitalic structures, but can be distinguished by retrolateral tibial apophysis shark-fin-shaped, with a blunt triangular membranous projection dorsally ( Fig. 3C View FIGURE 3 ; vs. retrolateral tibial apophysis finger-shaped, with arc-shaped membranous projection dorsally in X. linzhiensis , Fig. 3A View FIGURE 3 ), the presence of embolar base bump ( Fig. 8F View FIGURE 8 ; vs. embolar base bump absent in X. linzhiensis , Fig. 5C View FIGURE 5 ) in males, and the small body (comparatively large in X. linzhiensis ), the relatively large scape, almost two time length of primary spermathecae ( Fig. 6C View FIGURE 6 ; vs. scape relatively small, almost length of primary spermathecae in X. linzhiensis , Fig. 6A View FIGURE 6 ), transversal folds slightly curved ( Fig. 6D View FIGURE 6 ; vs. strongly curved in X. linzhiensis , Fig. 6B View FIGURE 6 ), and the trapezoidal atrium ( Fig. 6C View FIGURE 6 ; vs. triangular atrium in X. linzhiensis , Fig. 6A View FIGURE 6 ) in females.

Description. Male. Holotype ( Fig. 7A–B View FIGURE 7 ; MHBU-ARA- 2022-26-1): total length 3.70; carapace 1.93 long, 1.45 wide; abdomen 1.77 long, 1.28 wide. Eye sizes and interdistances:AME 0.07, ALE 0.10, PME 0.06, PLE 0.07; AME‒AME 0.05, AME‒ALE 0.01, PME‒PME 0.06, PME‒PLE 0.06, ALE‒PLE 0.04. Leg measurements: I 5.52 (1.46, 0.77, 1.32, 1.11, 0.86), II 3.85 (1.09, 0.53, 0.89, 0.75, 0.59), III 3.50 (0.98, 0.40, 0.74, 0.82, 0.56), IV 5.27 (1.34, 0.61, 1.14, 1.36, 0.82). Leg formula: 1423. Cheliceral promargin with three teeth, retromargin with two ( Fig. 2D View FIGURE 2 ). Color in alcohol ( Fig. 7A–B View FIGURE 7 ): carapace dark brown; legs yellow-brown.

Palp ( Figs 3C View FIGURE 3 , 8 View FIGURE 8 ). Retrolateral tibial apophysis shark-fin-shaped, with a blunt triangular membranous projection dorsally; embolar radix with an arc-shaped projection distally; embolar base with a branched bump and distoventrally with a relatively long, curved embolar base projection; embolus curved ventrally; median apophysis wide at base, narrowest at median part, almost 3 times thinner than base.

Female. Total length 3.30–4.74. One paratype ( Fig. 7C–D View FIGURE 7 ; MHBU-ARA- 2022-26-2): total length 3.39; carapace 1.62 long, 1.15 wide; abdomen 1.77 long, 1.17 wide. Eye sizes and interdistances: AME 0.07, ALE 0.09, PME 0.07, PLE 0.07; AME‒AME 0.05, AME‒ALE 0.02, PME‒PME 0.08, PME‒PLE 0.05, ALE‒PLE 0.06. Leg measurements: I 3.82 (1.23, 0.49, 0.87, 0.64, 0.59), II 2.82 (0.80, 0.41, 0.65, 0.48, 0.48), III 2.97 (0.88, 0.42, 0.69, 0.48, 0.50), IV 4.24 (1.18, 0.47, 0.87, 1.04, 0.68). Leg formula: 4132. Chelicerae ( Fig. 2C View FIGURE 2 ) as in male. Color in alcohol ( Fig. 7C–D View FIGURE 7 ) as in male.

Epigyne ( Fig. 6C–D View FIGURE 6 ). Atrium almost trapezoid-shaped with six transversal folds; scape relatively large, with a ratio of length to width less than 1.5; anterior fold well sclerotized; lateral folds almost triangular-shaped, well sclerotized; secondary spermathecae oval, small.

Distribution. China (Xizang) ( Fig. 23 View FIGURE 23 ).