Ischnothyreus taunggyi 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/E8228172-15A8-4BCB-8B68-BC87903BCBDE
taxon LSID	lsid:zoobank.org:act:E8228172-15A8-4BCB-8B68-BC87903BCBDE
treatment provided by	ZooKeys by Pensoft
scientific name	Ischnothyreus taunggyi Tong & Li
status	sp. nov.

Treatment

Ischnothyreus taunggyi Tong & Li sp. nov. Figures 8 View Figure 8 , 9 View Figure 9 , 10 View Figure 10 , 14D-F View Figure 14 , 15C, D View Figure 15 , 16G, H View Figure 16

Type material.

Holotype ♂: Myanmar, Shan State, Taunggyi, East of Nyaung Shwe Township; 20°34'700"N, 96°57'450"E; elevation ca 1005 m; 30.XI.2016; Wu J. leg. (IZCAS AR-25177). Paratypes 2♀: same data as for holotype (IZCAS AR-25178-25179).

Diagnosis.

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

Description.

Male (holotype). Body: habitus as in Fig. 8A-C View Figure 8 ; body length 1.71. Carapace: 0.84 long, 0.63 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. 8D View Figure 8 ). Clypeus: height about equal to ALE radius or more. Eyes: six, in one group, well developed, ALE largest, ALE circular, PME and PLE oval, posterior eye row recurved from above, procurved from front (Fig. 8D View Figure 8 ). Sternum: as long as wide, pale orange, uniform, not fused to carapace, surface smooth, setae sparse (Fig. 8E View Figure 8 ). Mouthparts: chelicerae, endites and labium orange; chelicerae straight, with crown-shaped sclerotized process at base of fangs, fang groove with a few small and one larger denticles (Fig. 15C, D View Figure 15 ); labium rectangular, not fused to sternum, anterior margin not indented at middle; anteromedian tip of endites with one strong, tooth-like projection (Fig. 8E View Figure 8 ). Abdomen: 0.74 long, 0.49 wide; dorsal scutum well sclerotized, pale orange, covering 2/3 the abdomen width and approximately 3/4 of the abdomen length, unfused to epigastric scutum; epigastric and postgastric scutum well sclerotized, pale orange, fused, postgastric scutum covering about 4/5 of the abdomen length (Fig. 8A, B View Figure 8 ). Legs: pale orange, femur I with three prolateral and one small retrolateral 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 two large ventral protuberances, distal end of bulb elongated, with one leaf-shaped prolateral projection and distal needle like membrane, retrolateral lobe broad, ear-shaped (Figs 9 View Figure 9 , 14D-F View Figure 14 ).

Female (paratype, IZCAS AR-25178). Same as male except as noted. Body: habitus as in Fig. 10A-C View Figure 10 ; body length 1.98. Carapace: 0.83 long, 0.71 wide; without any pattern (Fig. 10D View Figure 10 ). Mouthparts: chelicerae and endites unmodified (Fig. 10E, G View Figure 10 ). Abdomen: 1.27 long, 0.83 wide; dorsal scutum covering less than 1/2 of the abdomen length, about 1/3 of the abdomen width (Fig. 10A View Figure 10 ). Epigastric area: the postgastric scutum with central anchor-shaped structure (Fig. 10H View Figure 10 ). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, very complex winding tube posteriorly, ending in a small, bell-shaped atrium (Fig. 16G, H View Figure 16 ).