Ischnothyreus mangun Tong & Li sp. nov. Figures 4, 5, 6, 20D-F, 22C, D, 23C, D

Type material.

Holotype ♂: China, Yunnan, Menghai County, Mangun Stockaded Village, Xishuangbanna Natural Reserve, secondary forest; 22°02 ’12’’ N, 100°23 ’28’’ E; 1179 m; 20.III.2016; S. Li leg. (SYNU-385). Paratype. 1♀: same data as for holotype (SYNU-386).

Diagnosis.

The new species is similar to I. cristiformis sp. nov. and I. xiaolongha sp. nov. in the lamella-like membrane of male palp and the short dorsal scutum of the abdomen, but can be distinguished by the unmodified male cheliceral fang (Fig. 4H, I) (vs the large cockscomb-shaped sclerotized process (Fig. 1H-J) in I. cristiformis sp. nov. and the tongue-shaped sclerotized process (Fig. 17H-J) in I. xiaolongha sp. nov.), the narrow leaf-shaped retrolateral lobe of the male palp (Fig. 5F) (vs broad rectangular-shaped (Fig. 2F) in I. cristiformis sp. nov. and broad leaf-shaped (Fig. 18F) in I. xiaolongha sp. nov.). The female differs from I. cristiformis and I. xiaolongha by the small rectangular-shaped atrium (Fig. 6F) (vs the large bowl-shaped atrium (Fig. 3H) in I. cristiformis sp. nov. and small bell-shaped atrium (Fig. 19H) in I. xiaolongha sp. nov.).

Description.

Male (holotype). Body: habitus as in Fig. 4A-C; body length 1.52. Carapace: 0.81 long, 0.61 wide; yellow, with egg-shaped patches behind eyes, surface of elevated portion of pars cephalica smooth, sides finely reticulate, lateral margin straight, smooth (Fig. 4D, E). Clypeus: height about 1.3 times ALE diameter (Fig. 4G). Eyes: see Fig. 4D, G. Sternum: pale orange (Fig. 4F). Mouthparts: chelicerae, endites and labium orange; chelicerae straight, base of fangs unmodified, fang groove with a few small denticles (Figs 4H, I, 22C, D); anteromedian tip of endites with one strong, tooth-like projection (Fig. 4F). Abdomen: 0.65 long, 0.49 wide; dorsal scutum well sclerotized, pale orange, covering 1/3 of the abdomen width and approximately 1/2 of the abdomen length, not fused to epigastric scutum; epigastric and postgastric scutum well sclerotized, pale orange, fused, postgastric scutum covering about 1/2 of the abdomen length (Fig. 4A-C). Legs: pale orange, femur I with 2 prolateral spines, tibia I with 4 pairs, metatarsus I with 2 pairs of long ventral spines. Legs II lost. Legs III and IV spineless. Palp: trochanter with ventral projection, cymbium brown; bulb with 2 ventral protuberances, one large and another very small, distal end of bulb stout, with numerous lamella-like membranes, retrolateral lobe narrow leaf-shaped (Figs 5, 20D-F).

Female (paratype, SYNU-386). Same as male except as noted. Body: body length 1.93. Carapace: 0.80 long, 0.64 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 1.20 long, 0.81 wide; dorsal scutum very small. Epigastric area: the postgastric scutum with a strongly sclerotized structure in the middle (Fig. 6F). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, simple, winding tube posteriorly, ending in a small rectangular shaped atrium (Fig. 23C, D).

Etymology.

The specific name is a noun in apposition taken from the type locality.

Distribution.

Known only from the type locality.