Ischnosoma yunnanum, Kocian, Matúš & Schülke, Michael, 2016

Kocian, Matúš & Schülke, Michael, 2016, New species and records of Ischnosoma Stephens (Coleoptera, Staphylinidae, Tachyporinae) from China, Zootaxa 4105 (3), pp. 201-242 : 213-214

publication ID	https://doi.org/ 10.11646/zootaxa.4105.3.1
DOI	https://doi.org/10.5281/zenodo.5680060
persistent identifier	https://treatment.plazi.org/id/03B48788-FFE1-3F6A-FF21-90ECFAD3FED1
treatment provided by	Plazi
scientific name	Ischnosoma yunnanum
status	sp. nov.

Treatment

Ischnosoma yunnanum View in CoL sp. n.

Figs 3 View FIGURES 2 – 4 , 19 View FIGURE 19 , 23–26 View FIGURES 23 – 26 , 53 View FIGURES 46 – 53 , 58 View FIGURES 58 – 60 .

Description. Body ( Fig. 3 View FIGURES 2 – 4 ) blackish, anterior margin of pronotum, humeral spot and posterior margin of elytra, posterior margins of tergites, legs, palpi and basal two antennomeres brownish-yellow. Pronotum, elytra, and abdomen with distinct blue-goldish hue.

Head 0.65–0.68 mm broad; 0.62–0.65 times as broad as pronotum, distinctly broader than long, narrower posteriad, broadest in the middle. Eyes very large and bulbous, more than twice as long as temples. Surface smooth without microsculpture. Antenna stout and very long (1.84–2.12 mm). Antennomere X distinctly longer than broad.

Pronotum 1.03–1.04 mm broad; 0.88 mm long; 1.17–1.18 times as broad as long. Posterior half of pronotum parallel-sided, posterior angles acute. Surface with very fine transverse microsculpture, finely and sparsely punctate.

Elytra distinctly widened posteriad; along suture 1.21 mm long; 1.3–1.41 times as broad as pronotum; 1.37 times as long as pronotum. Surface with very fine transverse microsculpture. Sutural row with 16–18 punctures, discal row with 17–18 punctures and lateral row with 17–18 punctures. Hind wings fully developed.

Abdomen gradually tapering towards apex, sparsely puntate. Tergite VII with palisade fringe. Surface smooth with very fine microsculpture.

Length of forebody 2.9 mm; total body length 5.0– 5.6 mm.

Male. Sternite VII at posterior margin distinctly and broadly concave, along central part of posterior margin with thin long setae ( Fig. 23 View FIGURES 23 – 26 ). Sternite VIII with areas of palisade and beard-like setae forming six rows, these rows contiguous in the middle, and with medial area of very dense setae ( Fig. 24 View FIGURES 23 – 26 ). Paramere and aedeagus: Figs 25–26 View FIGURES 23 – 26 .

Etymology. The specific epitheth is an adjective derived from Yunnan, the Chinese province where this species was collected.

Type material. Holotype, male: " CHINA (Yunnan) Nujiang Lisu Pref., Gaoligong Shan, "Cloud pass" 3150 m, 21 km NW Liuku (shrubs, Vaccinium, bamboo, litter sifted), 25°58'21''N 98°41'01''E, 2.IX.2009, D.W.Wrase (22A) / Ischnosoma cf. rosti det. M. Schülke 2012 / Sammlung M. Schülke, Berlin" (cSch).

Paratypes (2): "P.R. China, Yunnan, E slope N Gaoligongshan, N 27°47'22.1'' E 098°32'17.7'', 24.V.2010, 3027 m, sifting 21, V. Grebennikov", 1 ex. ( CNC). " CHINA: N-Yunnan [C 2005-16] Nujiang Lisu Aut. Pref., Gongshan Co., Gaoligong Shan, side valley, 3000–3050 m, 27°47.90'N, 98°30.19'E / conif. forest with Rhododendron, broad leaved bushes, litter, moss, dead wood sifted along creek and snowfields, 21.VI.2005, leg. M. Schülke [C 2005- 16]", 1 ex. (cKoc).

Distribution. Northwestern Yunnan ( Fig. 19 View FIGURE 19 ): northern and central parts of the Gaoligong Shan range. Remarks. I. yunnanum sp. n. differs from all similar Chinese species of the I. pictum group by the chaetotaxy of the male sternite VIII. It is the only species with contiguous areas of beard-like and palisade setae.