Xizangiana rigaze ( Song, Zhu & Zhang, 2004 )

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 : 457-458

Xizangiana rigaze ( Song, Zhu & Zhang, 2004)

(ƱḄfflqǥ)

Figs 2E , 3F , 13–14

Xizangia rigaze Song et al., 2004: 246 , 337, fig. 143 A–H.

Xizangiana rigaze Sherwood et al., 2022: 64 (transfer from Xizangia ).

Type material. Holotype ♁ (MHBU-ARA-005553), CHINA: Xizang Autonomous Region , Rigaze City , 29°12'N, 88°48'E, 6 September 2002, leg. Minshen Zhu & Feng Zhang, examined.

Diagnosis. Male differs from all the congeners by having a short embolar base projection (much shorter than embolus), a broad embolar base (almost two times as wide as high) and a long and twisted embolus (almost the length of tegulum) ( Figs. 14 ).

Redescription. Male. Holotype ( Fig. 13A‒B ; MHBU-ARA-005553): total length 5.50; carapace 2.35 long, 1.80 wide; abdomen 3.15 long, 1.58 wide. Eye sizes and interdistances:AME 0.07, ALE 0.10, PME 0.08, PLE 0.09; AME‒AME 0.07, AME‒ALE 0.03, PME‒PME 0.07, PME‒PLE 0.08, ALE‒PLE 0.07. Leg measurements: I 6.38 (1.80, 0.98, 1.52, 1.17, 0.91), II 5.38 (1.45, 0.71, 1.28, 1.08, 0.86), III 4.81 (1.30, 0.46, 1.11, 1.08, 0.86), IV 7.26 (1.85, 0.91, 1.60, 1.94, 0.96). Leg formula: 4123. Cheliceral promargin with four teeth, retromargin with two ( Fig. 2E , 13C ). Color in alcohol ( Fig. 13A–B ): carapace dark brown; legs yellow-brown.

Palp ( Figs 3F , 13D , 14 ). Retrolateral tibial apophysis slightly curved, with a triangular membranous projection dorsally; embolar radix projection absent; embolar base with a short distolateral embolar base projection (much shorter than embolus); embolus long and twisted (almost the length of tegulum); median apophysis wide at basally, kidney-shaped in retrolateral view.

Female. Unknown.

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

Figures

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 13. Xizangiana rigaze, male. A–B. Habitus, in dorsal (A) and ventral (B) view; C. Chelicerae, ventral view; D. RTA, retrolateral view.

FIGURE 14. Palp of Xizangiana rigaze, in prolateral (A), ventral (B) and retrolateral (C) view.

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..