Ischnothyreus zhigangi Tong & Li sp. nov. Figures 11, 12, 13, 14G-I, 15E, F, 17E, F

Type material

. Holotype ♂: Myanmar, Putao, Hponkanrazi Wildlife Sanctuary Around Camp 2; 27°36'681"N, 96°58'958"E; elevation ca 2457 m; 11.V.2017; Wu J. & Chen Z. leg. (IZCAS AR-25178). Paratypes 4♀: data same as for holotype; 27°31'103"N, 96°57'694"E; elevation ca 2737 m; 16.V.2017; Wu J. & Chen Z. leg. (IZCAS AR-25179-25182).

Diagnosis.

The new species is similar to I. taunggyi sp. nov. but can be distinguished by the short abdominal dorsal scutum (very small (Fig. 11A) vs 3/4 of the abdomen length; Fig. 8A) and ventral scutum (very small (Fig. 11B) vs 4/5 of the abdomen length; Fig. 8B) of male, and the short abdominal dorsal scutum (very small (Fig. 13A) vs less than 1/2 of the abdomen length; Fig. 10A) and the inverted bell-shaped atrium (Fig. 17E) (vs nipple-shaped atrium (Fig. 16G) of female).

Description.

Male (holotype). Body: habitus as in Fig. 11A-C; body length 2.08. Carapace: 1.03 long, 0.87 wide; pale brown, with egg-shaped patches behind eyes, ovoid in dorsal view, strongly elevated in lateral view, surface of elevated portion of pars cephalica smooth, sides finely reticulate, fovea absent, lateral margin straight, smooth (Fig. 11D). Clypeus: height about equal to ALE radius or more. Eyes: six, in one group, well developed, subequal, ALE circular, PME and PLE oval, posterior eye row straight from above, procurved from front (Fig. 11D). Sternum: as long as wide, pale brown, uniform, not fused to carapace, surface smooth, setae sparse (Fig. 11E). Mouthparts: chelicerae, endites and labium orange; chelicerae straight, base of fangs with crown-shaped sclerotized process with serrated exterior margin (Figs 11G, H, 15E, F), fang groove with a few small denticles; labium rectangular, not fused to sternum, anterior margin not indented at middle; anteromedian tip of endites with one strong, tooth-like projection (Fig. 11E). Abdomen: 1.07 long, 0.72 wide; dorsal scutum weakly sclerotized, pale orange, very small, not fused to epigastric scutum; epigastric and postgastric scutum weakly sclerotized, pale orange, fused, postgastric scutum very small (Fig. 11A, B). Legs: pale orange, femur I with three prolateral spines, tibia I with four pairs, metatarsus I with two pairs of long ventral spines. Leg II spination is similar to leg I except femur with only two prolateral spines. Legs III and IV spineless. Palp: strongly sclerotized, trochanter with ventral projection, cymbium brown, fused with bulb; bulb brown, with one large ventral protuberance, distal end of bulb elongated, with one narrow leaf-shaped prolateral projection, retrolateral lobe small, simple (Figs 12, 14G-H).

Female (paratype, IZCAS AR-25179). Same as male except as noted. Body: habitus as in Fig. 13A-C; body length 2.63. Carapace: 1.10 long, 0.95 wide; without any pattern, posterior eye row procurved from both above and front (Fig. 13D, G). Mouthparts: chelicerae and endites unmodified (Fig. 13E, G). Abdomen: 1.82 long, 1.19 wide. Epigastric area: the postgastric scutum with central anchor-shaped structure (Fig. 13H). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, simple winding tube posteriorly, ending in a small, inverted bell-shaped atrium (Fig. 17E, F).

Etymology.

The species is named after Mr Zhigang Chen, one of the collectors of the holotype; noun in genitive case.

Distribution.

Known only from the type locality.