Ischnothyreus zhigangi Tong & Li, 2020

Tong, Yanfeng, Li, Shuqiang & Bian, Dongju, 2020, Taxonomic study of the genus Ischnothyreus Simon, 1893 from Myanmar (Araneae, Oonopidae), ZooKeys 993, pp. 1-26 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.993.57676
publication LSID	lsid:zoobank.org:pub:DAFA5BEE-7571-4CA8-99D1-D76DFFCAB875
persistent identifier	https://treatment.plazi.org/id/CB6C29F2-AC7C-4511-8F20-7771D82CB329
taxon LSID	lsid:zoobank.org:act:CB6C29F2-AC7C-4511-8F20-7771D82CB329
treatment provided by	ZooKeys by Pensoft
scientific name	Ischnothyreus zhigangi Tong & Li
status	sp. nov.

Treatment

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

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 View Figure 11 ) vs 3/4 of the abdomen length; Fig. 8A View Figure 8 ) and ventral scutum (very small (Fig. 11B View Figure 11 ) vs 4/5 of the abdomen length; Fig. 8B View Figure 8 ) of male, and the short abdominal dorsal scutum (very small (Fig. 13A View Figure 13 ) vs less than 1/2 of the abdomen length; Fig. 10A View Figure 10 ) and the inverted bell-shaped atrium (Fig. 17E View Figure 17 ) (vs nipple-shaped atrium (Fig. 16G View Figure 16 ) of female).

Description.

Male (holotype). Body: habitus as in Fig. 11A-C View Figure 11 ; 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 View Figure 11 ). 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 View Figure 11 ). Sternum: as long as wide, pale brown, uniform, not fused to carapace, surface smooth, setae sparse (Fig. 11E View Figure 11 ). Mouthparts: chelicerae, endites and labium orange; chelicerae straight, base of fangs with crown-shaped sclerotized process with serrated exterior margin (Figs 11G, H View Figure 11 , 15E, F View Figure 15 ), 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 View Figure 11 ). 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 View Figure 11 ). 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 View Figure 12 , 14G-H View Figure 14 ).

Female (paratype, IZCAS AR-25179). Same as male except as noted. Body: habitus as in Fig. 13A-C View Figure 13 ; 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 View Figure 13 ). Mouthparts: chelicerae and endites unmodified (Fig. 13E, G View Figure 13 ). Abdomen: 1.82 long, 1.19 wide. Epigastric area: the postgastric scutum with central anchor-shaped structure (Fig. 13H View Figure 13 ). 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 View Figure 17 ).

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.