Clubiona biforamina new species

Figs 1–12

Type material. Holotype: Ƌ from Nankang (24°49'00"N, 98°46'60"E, 2100 m), Tengchong County, Yunnan Province, China, 4–7 November 1998, C. Griswold, D.H. Kavanaugh, C.L. Long leg.. Paratypes : CHINA. Yunnan Province: 1 ♀, same data as holotype; 2 Ƌ, Tengchong County, Henghe Village, 60th km of Bawan–Tengchong road (25°00'30"N, 98°25'15"E, 1594 m), 19 October 2003, G. Tang leg. ; 1 ♀, Fugong County, Lumadeng Township, 0.4 km SSE Shibali guesthouse (27°09'48"N, 98°46'55"E, 2475 m), 5 May 2004, C. Griswold, D.H. Kavanaugh leg..

Etymology. The specific name is the combination of the prefix “ bi -” (double) and the Latin “ foramen ” (hole), referring to the two small, circular copulatory openings in the female epigyne; adjective.

Diagnosis. Males and females of Clubiona biforamina n. sp. resemble those of C. linzhiensis Hu, 2001 described from Xizang, China (see Yu et al., 2012, figs 17–39), but differ by the tibia with a membranous lamella covering the retrolateral tibial apophysis in retrolateral view (Figs 5, 10); tegular apophysis absent (Figs 4, 9); apex of conductor placed below the apex of embolus; conductor and embolus apexes well separated in prolateral view (Figs 3, 8); atrium hump-shaped, longitudinal; copulatory openings circular, located on the middle of atrium (Figs 6, 11); spermathecae transversally U-shaped, located over the bursae (Figs 7, 12); dorsum of abdomen without color markings (Figs 1, 2).

Description. Male (holotype). Total length 5.20; carapace 2.50 long, 1.70 wide; abdomen 2.70 long, 1.40 wide. Cephalothorax (Fig. 1). Carapace brownish yellow; chelicerae brownish yellow, promargin with five teeth, fourth largest, retromargin with six subequal teeth; endites and labium brownish yellow; sternum brownish yellow, with few long hairs. Eyes. In dorsal view, anterior eye row slightly recurved, posterior eye row almost straight; AME dark, other eyes light, surrounded by black pigment; eye diameters and interdistances: AME 0.08, ALE 0.15, PLE 0.10, PME 0.15, AME–AME 0.10, AME–ALE 0.05, PME–PME 0.23, PME–PLE 0.13; MOQL 0.28, MOQA 0.28, MOQP 0.43. Legs light yellow; tibiae I and II with six ventral spines, metatarsi I and II with one pair of ventral spines; leg measurements: I 7.04 (1.88, 3.0, 1.38, 0.78), II 9.41 (2.45, 3.90, 2.08, 0.98), III 6.64 (1.83, 2.50, 1.68, 0.63), IV 8.93 (2.40, 3.10, 2.55, 0.88); leg formula: II, IV, I, III. Abdomen (Fig. 1). Dorsum light yellow, with two pairs of muscular depressions; venter light yellow; spinnerets light yellow. Palp (Figs 3–5, 8–10). Femur and patella unmodified, without apophyses; ventral tibial apophysis conical, with blunt apex, retrolateral tibial apophysis flat, triangular, covered by a tibial membranous lamella; cymbium longer than bulb; bulb elongate-oval, sperm duct thick and U-shaped in ventral view; conductor with wider base and sharply pointed apex; embolus slender, with cuspidal apex.

Female (paratype). Total length 6.90; carapace 2.60 long, 1.95 wide; abdomen 4.20 long, 2.75 wide. Cephalothorax (Fig. 2). General color darker than that of male; chelicerae promargin with five teeth, fourth largest, retromargin with five subequal teeth. Eye diameters and interdistances: AME 0.10, ALE 0.15, PLE 0.10, PME 0.13, AME–AME 0.08, AME–ALE 0.05, PME–PME 0.28, PME–PLE 0.18; MOQL 0.35, MOQA 0.30, MOQP 0.40. Leg measurements: I 5.41 (1.50, 2.18, 1.10, 0.63), II 6.15 (1.70, 2.50, 1.25, 0.70), III 5.38 (1.58, 1.90, 1.35, 0.55), IV 7.56 (2.18, 2.65, 2.10, 0.63); leg formula: IV, II, I, III. Epigyne (Figs 6–7, 11–12). Atrium hump-shaped, located at anterior part of epigynal plate; two small, circular copulatory openings, located in the middle of atrium; copulatory ducts indistinct; spermathecae with ovoid heads and tubular, transversally U-shaped bases; bursae ovoid, translucent.

Distribution. Presently known only from Yunnan, China.