Xizangiana longlin 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 : 458-459

Xizangiana longlin Liu & Zhang , sp. n.

(AEṚqǥ)

Figs 1B , 2M–O , 3E , 15–17

Type material. Holotype ♁ (MHBU-ARA-2018-103-1), CHINA: Xizang Autonomous Region, Lhasa City, Dazi District , Quyu Village , 29°47.573’N, 91°31.039’E, 3754 m elev., 5 July 2018, leg. LuYu Wang. Paratype: 5♁ (MHBU-ARA-2018-103-2 to 6), 1♀ (MHBU-ARA-2018-103-7), same data as holotype, except 19 July 2020 ; 1♁ (MHBU-ARA-2022-42-1), same data as previous except Zhangduo Village , 29.796337°N, 91.516653°E, 3716 m elev., 2 July 2022, leg. Bo Liu.

Etymology. The species name comes from the Chinese word “Longlin”, which means Dragon scales, referring to the scaly surface of embolar base projection ( Fig. 15A ); noun in apposition.

Diagnosis. This new species resembles X. benae sp. n. in genitalic structures, but can be distinguished by the larger body size, the curved embolus, an almost triangular retrolateral tibial apophysis, and the presence of a broom-shaped distolateral embolar base projection ( Fig. 16 ; vs. a relatively straight embolus with edge angle, an almost trapezoidal retrolateral tibial apophysis, and a nail-shaped ventral embolar base projection, Fig. 19 ) in males, and the v-shaped anterior parts of the lateral folds, the globular secondary spermathecae and the once curved copulatory duct ( Fig. 17 ; vs. arc-shaped anterior parts of the lateral folds, oval secondary spermathecae, and twice curved copulatory duct, Fig. 20C‒D ) in females.

Description. Male. Total length 4.03–4.85. Holotype (Fig.A‒B; MHBU-ARA-2018-103-1): total length 4.08; carapace 2.02 long, 1.47 wide; abdomen 2.06 long, 1.39 wide. Eye sizes and interdistances: AME 0.08, ALE 0.11, PME 0.08, PLE 0.08; AME‒AME 0.06, AME‒ALE 0.01, PME‒PME 0.04, PME‒PLE 0.05, ALE‒PLE 0.04. Leg measurements: I 4.96 (1.44, 0.62, 1.22, 0.94, 0.74), II 4.51 (1.26, 0.62, 1.03, 0.83, 0.77), III 3.98 (1.08, 0.48, 0.79, 0.93, 0.70), IV 5.94 (1.49, 0.71, 1.29, 1.57, 0.88). Leg formula: 4123. Cheliceral promargin with four teeth, retromargin with two ( Fig. 2M–N ). Color in alcohol ( Fig. 15A–B ): carapace dark brown; legs yellow-brown.

Palp ( Figs 3E , 16 ). Retrolateral tibial apophysis broad, slightly curved with a thin, triangular membranous projection dorsally; embolar radix projection absent; embolar base projection broom-shaped, with saw-like edges and scaly surface; embolus thick, curved; median apophysis with wide base, narrow curved distal part with blunt apex.

Female. Paratype (Fig. C‒D; MHBU-ARA-2018-103-7): total length 5.09; carapace 2.23 long, 1.60 wide; abdomen 2.86 long, 1.61 wide. Eye sizes and interdistances: AME 0.09, ALE 0.14, PME 0.08, PLE 0.09, AME‒ AME 0.02, AME‒ALE 0.02, PME‒PME 0.05, PME‒PLE 0.05, ALE‒PLE 0.07. Leg measurements: I 5.05 (1.57, 0.65, 1.24, 0.82, 0.77), II 4.80 (1.36, 0.71, 1.09, 0.80, 0.84), III 3.09 (0.19, 0.52, 0.77, 0.93, 0.68), IV 6.43 (1.77, 0.80, 1.30, 1.68, 0.88). Leg formula: 4123. Chelicerae ( Fig. 2O ) as in male. Color in alcohol ( Fig. 15C–D ) as in male.

Epigyne ( Fig. 17A–B ).Atrium almost trapezoidal, with eight well sclerotized transversal folds; scape with a ratio of length to width more than 1.5; anterior fold partly sclerotized; anterior parts of the lateral folds and posterior parts of the lateral folds v-shaped, close with each other; copulatory duct curved once anteriorly; secondary spermathecae globular, small.

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

Figures

FIGURE 1. Habitats and living spiders of Xizangiana spp., with arrows pointing to where the specimens were collected. A. X. namcharbawa sp. n. in Pai Town, Mainling County, Xizang Autonomous Region, China; B. X. longlin sp. n. in Quyu Village, Dazi District, Lhasa City, Xizang Autonomous Region, China; C–D. X. benae sp. n., junior (C) and female (D); E. X. benae sp. n. in Drepung Monastery, Niangre Village, Chengguan District, Lhasa City, Xizang Autonomous Region, China.

FIGURE 2. Chelicerae, ventral view. A–B. X. linzhiensis, female (A) and male (B); C–D. X. namchabarwa sp. n., female (C) and male (D); E. X. rigaze, male. F–H. X. shenxian sp. n., female (F–G) and male (H); I–J. X. benae sp. n., female (I) and male (J); K–L. X. xiangbi sp. n., female (K) and male (L); M–O. X. longlin sp. n., male (M–N) and female (O); Scale bars = 0.1 mm.

FIGURE 3. RTA, retrolateral view. A. X. linzhiensis; B. X. xiangbi sp. n.; C. X. namchabarwa sp. n.; D. X. shenxian sp. n.; E. X. longlin sp. n.; F. X. rigaze; G. X. benae sp. n.. Scale bars = 0.05 mm.

FIGURE 15. Xizangiana longlin sp. n., male (A–B) and female (C–D). Habitus, in dorsal (A, C) and ventral (B, D) view. Scale bars = 0.5 mm.

FIGURE 16. Xizangiana longlin sp. n.. A–C. Palp, in prolateral (A), ventral (B) and retrolateral (C) view; D. Expanded palp, prolateral view; E. RTA, retrolateral view.

FIGURE 17. Female genitalia of Xizangiana longlin sp. n., in ventral (A) and dorsal (B) view.

FIGURE 19. Xizangiana benae sp. n.. A. Bulb, prolateral view; B. RTA, retrolateral view; C–D. Palp, in ventral (C) and retrolateral (D) view.

FIGURE 20. Female genitalia, in ventral (A, C) and dorsal (B, D) view. A–B. Xizangiana shenxian sp. n.; C–D. X. benae sp. n..

FIGURE 23. Records of Xizangiana species: 1 X. pawani comb. n.; 2 X. sedula comb. n.; 3 X. shenxian sp. n.; 4 X. rigaze; 5 X. benae sp. n.; 6 X. longlin sp. n.; 7 X. linzhiensis; 8 X. namchabarwa sp. n.. 9 X. xiangbi sp. n..