Ischnothyreus linzhiensis Hu, 2001

Figs 2A-L, 3A-I, 4A-C

Material examined.

7♂, 9♀ (SYNU-509-524): China, Tibet, Nyingchi, Pome County, Yigong Town, Kaduo Village, 30°07.515'N, 95°01.928'E; 2072 ± 3 m; 10.VIII.2013; Qi Cao leg.

Diagnosis.

This species is similar to I. serpentinum Saaristo, 2001 in the morphology of the winding duct and the size of the abdominal scuta, but can be distinguished by the large, snout-like structure of the endogyne (Fig. 3H, I) vs. a small posterior process (see Richard et al. 2016: fig. 75E), and the conical apophysis of the male cheliceral anterior face and the flag-like sclerotized process of the fang base (Figs 2D-F, 4C) vs. unmodified chelicerae (see Richard et al. 2016: fig. 70E).

Description.

Male (SYNU-509). Body: habitus as in Fig. 2A-C; body length 1.64. Carapace: 0.88 long, 0.65 wide; yellow, oval in dorsal view, pars cephalica strongly elevated in lateral view, surface of elevated portion of pars cephalica smooth, sides finely reticulate, lateral margin straight, smooth (Fig. 2G). Clypeus: straight in frontal view, ALE separated from edge of carapace by their diameter (Fig. 2I). Eyes: ALE largest, ALE circular, PME squared, PLE oval; posterior eye row recurved from above; ALE touching, ALE-PLE touching (Fig. 2G, I). Sternum: as long as wide, pale orange (Fig. 2H). Mouthparts: chelicerae, endites and labium yellow; chelicerae straight, anterior face with conical apophysis, base of fangs with large flag-like sclerotized process, fang groove with a few small and one larger denticles (Figs 2D-F, 3C); anteromedian tip of endites with one strong, tooth-like projection (Fig. 2H). Abdomen: 0.76 long, 0.44 wide; dorsal scutum dark brown, covering 4/5 of abdomen width and approximately 5/6 of abdomen length, not fused to epigastric scutum; postgastric scutum covering ~ 2/3 of abdomen length. Legs: pale orange, femur I with two prolateral spines, tibia I with four pairs, metatarsus I with two pairs of long ventral spines. Leg II spination similar to leg I, except femur with only one prolateral spine. Legs III and IV spineless. Palp: trochanter with ventral projection; bulb with one ventral protuberance, distal end of bulb stout, with dorsal membrane, needle-like membrane and two leaf-like projections (Figs 2J-L, 4A, B).

Female (SYNU-516). Same as male except as noted. Body: habitus as in Fig. 3A-C; body length 1.76. Carapace: 0.72 long, 0.67 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 1.05 long, 0.67 wide; dorsal scutum very small; epigastric scutum well sclerotized, orange; postgastric scutum widely hexagonal, only around epigastric furrow. Endogyne: winding duct complex, strongly convoluted, ending in large, snout-like structure (Fig. 3H, I).

Distribution.

China (Tibet: Nyingchi).