Ischnothyreus meukyawwa 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/08A2A68D-453F-4E7F-8F52-05FB0C49EDAC
taxon LSID	lsid:zoobank.org:act:08A2A68D-453F-4E7F-8F52-05FB0C49EDAC
treatment provided by	ZooKeys by Pensoft
scientific name	Ischnothyreus meukyawwa Tong & Li
status	sp. nov.

Treatment

Ischnothyreus meukyawwa Tong & Li View in CoL sp. nov. Figures 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 14A-C View Figure 14 , 15A, B View Figure 15 , 16C, D View Figure 16

Type material.

Holotype ♂: Myanmar, Kachin State, Putao, Meukyawwa Village; 27°20'883"N, 97°22'717"E; elevation ca 464 m; 25.XII.2016; Wu J. leg. (IZCAS AR-25160). Paratypes: 5♂ 9♀, same data as for holotype (IZCAS AR-25161-25174).

Diagnosis.

The new species is similar to I. an Tong & Li, 2016 in the large abdominal dorsal and ventral scutum, but can be distinguished by the unmodified male cheliceral fang (Fig. 3H, I View Figure 3 ) (vs with thorn-like protrusion; Tong et al. 2016: fig. 1G, H), the acute distal end of male palp (Fig. 14A View Figure 14 ) (vs blunt distal end of male palp; Tong et al. 2016: fig. 3A, D), and the small bell-shaped atrium (Fig. 16C View Figure 16 ) (vs a large equilateral triangular shaped atrium; Tong et al. 2016: fig. 2G, I).

Description.

Male (holotype). Body: habitus as in Fig. 3A-C View Figure 3 ; body length 1.57. Carapace: 0.89 long, 0.74 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. 3D, F View Figure 3 ). Clypeus: height about 2/3 of ALE diameter (Fig. 3G View Figure 3 ). Eyes: six, in one group, well developed, subequal, ALE circular, PME and PLE oval, posterior eye row recurved from above, procurved from front (Fig. 3D, G View Figure 3 ). Sternum: as long as wide, pale orange, uniform, not fused to carapace, surface smooth, setae sparse (Fig. 3E View Figure 3 ). Mouthparts: chelicerae, endites and labium orange; chelicerae straight, base of fangs with crown-shaped sclerotized process with serrated exterior margin, fang groove with a few small denticles (Figs 3H, I View Figure 3 , 15A, B 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. 3E View Figure 3 ). Abdomen: 0.84 long, 0.43 wide; dorsal scutum well sclerotized, pale orange, covering whole abdomen width and approximately 5/6 of the abdomen length, not fused to epigastric scutum; epigastric and postgastric scutum well sclerotized, pale orange, fused, postgastric scutum covering about 5/6 of the abdomen length (Fig. 3A-C View Figure 3 ). Legs: pale orange, femur I with three prolateral and two 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 and one retrolateral spine. Legs III and IV spineless. Palp: strongly sclerotized, trochanter with ventral projection, cymbium brown, fused with bulb; bulb brown, with one large and one very small ventral protuberance, distal end of bulb elongated, with one broad leaf-shaped prolateral projection and distal hook-shaped membrane, retrolateral lobe narrow (Figs 4 View Figure 4 , 14A-C View Figure 14 ).

Female (paratype, IZCAS AR-25160). Same as male except as noted. Body: habitus as in Fig. 5A-C View Figure 5 ; body length 1.93. Carapace: 0.89 long, 0.76 wide; without any pattern. Mouthparts: chelicerae and endites unmodified. Abdomen: 0.83 long, 0.75 wide; dorsal scutum covering 3/5 of the abdomen length, about 1/2 of the abdomen width. Epigastric area: the postgastric scutum with central anchor-shaped structure (Fig. 5E View Figure 5 ). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, simple winding tube posteriorly, ending in a small bell-shaped atrium (Fig. 16C, D View Figure 16 ).

Etymology.

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

Distribution.

Known only from the type locality.