Ischnosoma jumla Kocian & Schülke

Kocian, Matúš & Schülke, Michael, 2018, New species and records of Ischnosoma Stephens (Coleoptera: Staphylinidae: Tachyporinae) from Nepal, Zootaxa 4442 (4), pp. 501-522: 508-510

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Ischnosoma jumla Kocian & Schülke

sp. n.

Ischnosoma jumla Kocian & Schülke  , sp. n.

Figs 4 View Figure , 11 View Figure , 21–25View FIGURES 21–23View FIGURE 24View FIGURES 25–31, 33 View Figure .

Description. Body uniformly rufotestaceous, anterior parts of tergites darker. Legs, palpi and antennomeres I–II yellowish, antenna from third antennomere darker, brownish ( Fig. 4 View Figure ).

Habitus as in Figs 4 View Figure , 11 View Figure . Head 0.48–0.53 mm wide; 0.57–0.63 times as wide as pronotum, as wide as long. Eyes about 1.5 times as long as temples. Ocular puncture missing. Surface without microsculpture. Antenna 1.11– 1.29 mm long. Antennomeres IX–X distinctly wider than long.

Pronotum 0.75–0.86 mm broad; 0.65–0.75 mm long; 1.14–1.24 times as wide as long, widest in posterior half. Surface with sparse transverse microsculpture. Anterior and posterior punctures separated from pronotal margin by 1–2 times the diameter of punctures.

Elytra quadrangular, parallel-sided or slightly widened posteriad, along suture 0.58–0.73 mm long; 1.01–1.10 times as wide as pronotum; 0.84–0.96 times as long as pronotum. Surface with shallow transverse microsculpture similar to that of pronotum. Sutural and discal row with 6–9 punctures, lateral row with 6–10 punctures. Wings reduced.

Abdomen parallel-sided, slightly tapering towards apex, sparsely punctate. Tergite VII without palisade fringe. Surface smooth, with or without very indistinct transverse microsculpture.

Length of forebody 1.69–2.15 mm; total body length 3.41–4.8 mm.

Male. Apical margin of sternite VII slightly concave, with long thin setae in the middle ( Fig. 21 View Figure ). Apical margin of sternite VIII with 4–5 rows of palisade setae and with relatively short beard-like setae. Sternite VIII in median portion with triangular cluster of denser, shorter, and pointed setae ( Fig. 22 View Figure , 33 View Figure ). Aedeagus as in Fig. 23 View Figure .

Type material. Holotype, male: 579 NEPAL: Jumla Distr. , Ghurchi –Lagna Pass, 3500 m, 14.VI.1998, leg. W. Schawaller ( SMNSAbout SMNS). 

Paratypes (13): same data as holotype, 1♂ (cKoc); 576 Nepal, Mugu Distr. , SW Rara Lake, 3200 m, 12.VI.1998, leg. W. Schawaller, 1♂, 2♀♀ ( SMNSAbout SMNS, cSch); Nepal, Prov  . Seti, Distr. Bajura, 19 km WSW Simikot, Kuwadi Khola valley , 3500–3700 m NN, 05.VII.2001, 29°53'10''N, 81°38'40''E, leg. M. Hartmann, Laubgesiebe, fir-birch forest, 1♂ ( NMEAbout NME); Nepal, ProvGoogleMaps  . Karnali, Distr. Humla, 20 km W Simikot, 3 km W Chala, 4000–4300 m, 29°50'46''N, 81°35'55''E, 24.06.2001, leg. A. Kopetz, snow fields HF, 1♂ ( NMEAbout NME); Gebiet von Jumla, Westnepal, lg. H. Franz, Umg. Alm Darghari, b. Maharigaon, 4000 m, 4♂♂ ( NMWAbout NMW, cKoc, cSch); Gebiet von Jumla, Westnepal, lg. H. Franz, Dzunda – Khola Tal, b. Talphi, 3000–3500 m, 1♂ ( NMWAbout NMW); Gebiet von Jumla, Westnepal, lg. H. Franz, Dampa Pass, gegen Chauta, 1♂ ( NMWAbout NMW); Nepal, Manaslu Mts. , Bara Pokhari Lekh, 3000 m, 4.4.1999, leg. Hirthe, Jäger, Schmidt, 1♂ (cHir).GoogleMaps 

Etymology. The specific name (noun in apposition) alludes to the Nepalese district Jumla, where the holotype was collected.

Distribution. North of Central and West Nepal, Bajura, Gorkha, Humla, Jumla, and Mugu districts ( Fig. 24 View Figure ).

Remarks. I. jumla  sp. n. belongs to the I. pictum  species group. Its habitus resembles that of three related Nepalese species: I. jaljalense (Coiffait)  , I. nepalense (Scheerpeltz)  and I. nepalicum (Coiffait)  . Ischnosoma jumla  differs from these species by smaller body size and the following combination of male sexual characters: clusters of modified palisade and beard-like setae of sternite VIII relatively small, somewhat similar to those of I. nepalicum  ; shapes of the apices of the paired sclerites of the internal sac of the aedeagus characteristic ( Fig. 25 View Figure ). See also remarks in the section on I. nepalicum  .


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