Ischnosoma nepalicum ( Coiffait, 1982 )

Kocian, Matúš & Schülke, Michael, 2018, New species and records of Ischnosoma Stephens (Coleoptera: Staphylinidae: Tachyporinae) from Nepal, Zootaxa 4442 (4), pp. 501-522 : 515

Ischnosoma nepalicum ( Coiffait, 1982)

Figs 26 , 37 , 44 .

NEPAL: Baglung: Daulaghiri mountains, Baglung Lekh, 25 km W Baglung , primary forest, 2800–3000 m, 15.V.2004, leg. J. Schmidt, 4 exs. (cKle, cSch); Dolpa – Jumla: Pass Bavarla Lagna , 3200–3800 m, 29°10'N, 82°28.5'E, 6.VI.1997, leg. M. Hartmann, 2 exs. ( NME); Pass NW Chaurikot , 3800 m, 17.V.1995, leg. M. Hartmann, 1 ex. ( NME); Jumla: Khali–Lagna Pass , 3500 m, 16.–17.VI.1998, leg. W. Schawaller, 2 exs. ( SMNS); Ghurchi–Lagna Pass , 3500 m, 14.VI.1998, leg. W. Schawaller, 1 ex. ( SMNS); Gothichaur valley , forest, 2900– 3800 m, 29°12'N, 82°18.5'E, 11.VI.1997, leg. M. Hartmann, 1 ex. ( NME); SE Churta , sifted , 3400 m, 6.V.1995, leg. J. Weipert, 1 ex. ( NME); 6 km E Churta , deciduous forest, 3200 m, 18.V.1995, leg. M. Hartmann, 2 exs. ( NME), 1 ex. (cSch); 10 km E Churta , 3500 m, 5.–6.V.1995, sifted, leg. M. Hartmann, 2 exs. ( NME); 3 km E Churta , 29°10'53''N, 82°28'00''E , 6.VI.1987, 3400 m, GSB, leg. A. Weigel, 1 ex. ( NME), 1 ex. (cSch); before Pass SE Churta , 3400 m, pitfall traps, 17.V.1995, leg. J. Weipert, 4 exs. (NME); N Maharigaon , 3250 m, 29°20'N, 82°22'E , 8.–9.VII.1999, leg. A Weigel, 1 ex. (NME); Talphi, NE Maharigaun, 20.VI.1997, 3300 m, GSB, leg. A. Weigel, 2 exs. ( NME); 10 km SE Churta, Bavarla Langna Pass , 29°09'50''N, 82°28'53''E, 6.VI.1997 , 3800 m, leg. A. Weigel, 1 ex. (NME); Sinja Khola between Chauta and Neurigad, leg. H. Franz, 1 ex. (cSch); Dampelek near Jumla, [ Pa 220/ Pa 245] , leg. H. Franz, 2 exs. (NHMW); Dzunda Khola valley near Talphi, 3000–3500 m, [Pa 190], leg. H. Franz, 1 ex. ( NHMW) ; Kaski: Mardi Himal, W of Mardi Khola , 2950–3100 m, 28°26'02''N, 83°52'05''E, 13.V.2001, leg. G. Hirthe, 1 ex. (cHir); Annapurna mountains, Ghorepani– Deurali , 2800–3000 m, 2.V.1999, leg. C. Krüger & G. Hirthe, 1 ex. (cHir); Annapurna region, Mardi Himal , W Mardi Khola, 3400–3600 m, 28°26'02''N, 83°52'05''E, 13.–14.V.2001 , leg. G. Hirthe, 1 ex. (cHir); same data, but 2950–3100 m, 13.V.2001, 7 exs. (cHir), 1 ex (cKoc); Kathmandu: Mount Sheopuri , 2100–2300 m, 25.VI.1988, Quercus semecarpifolia forest, leg. J. Martens & W. Schawaller [306], 1 ex. ( SMNS), 1 ex. (cSch); Phulchoki near Kathmandu , leg. H. Franz, 1 ex. ( NHMW); Lamjung: Manaslu massif, Barapokhari Lekh , 23 km NE Besishahar village , 28°21'N, 84°33'E , 14.IX.2000, 3800–4100 m, sieved from moss and rhododendron leaf litter, leg. A. Hetzel, 3 ex. (cFel); Manaslu massif, Barapokhari Lekh, 12 km NE Besishahar village , 28°18'N, 84°28'E , 3100 m, near Lake Barapokhari , sieved from moss, 10.IX.2000, leg. A. Hetzel, 2 exs. (cFel); Mustang: Dhaulagiri mountains, Hile Kharka, 3000–3100 m, 28°29'15''N, 83°34'28''E , 9.V.2009, leg. J. Schmidt, 1 ex. ( NME); S slope Dhaulagiri Mts. , NE slope Asnam Duri, 3100–3300 m, 28°31'50''N, 83°27'57''E, 14.V.2009, leg. J. Schmidt, 6 exs. ( NME), 2 exs. (cKoc); Dhaulagiri SE slope, SW slope of Lete Pass , 13.V.2002, 2700–3000 m, leg. J. Schmidt, 1 ex. (cSch); SW Dhaulagiri, W Jaljala , 3300–3400 m, 28°30'44''N, 83°13'15''E, 20.V.2012, leg. J. Schmidt, 4 exs. ( NME), 1 ex. (cKoc); same data but : 3150 m, 23.IX.12, 28°30'05''N, 83°11'48''E, 2 exs. ( NME); SW Dhaulagiri Himal. near Jaljala La , 3300–3500 m, 12./13./ 21.V.2012, 28°30'N, 83°15'E, leg. J. Schmidt, 5 exs. ( NME), 1 ex. (cKoc), 1 ex. (cSch); Kali Gandaki valley , upper Lete , 19.V.2002 , 2800 m, leg. J. Schmidt, 5 exs. ( NME, cSch); Parbat: between Deorali and Chitre , 2700 m, 1.–2.V.1995, leg. J. Martens & W. Schawaller, 5 exs. (SMNS), 1 ex (cKoc).

Remarks. I. nepalicum is closely related to three very similar apterous and endemic Nepalese species of the I. pictum species group: I. nepalense , I. jaljalense , and I. jumla sp. n. In a previous key ( Kocian, 2003), the absence of an ocular puncture and seta was used for distinguishing I. nepalicum from similar species. In the material listed above we found specimens of I. nepalicum with similarly developed ocular puncture and seta as in I. nepalense . Therefore, a reliable identification is possible only based on the male sexual characters, above all the chaetotaxy of the male sternite VIII in combination with the shapes of the internal structures of the aedeagus. The shape of large paired sclerites in the internal sac of the aedeagus is characteristic in lateral view, but well visible only when extruded ( Figs 25–27 ). However, since none of the previously studied specimens of I. jaljalense shows a well visible extruded internal sac of aedeagus, the validity of this species requires revision.

Widespread in Nepal ( Fig. 44 ).

Figures

FIGURE 44. Distribution of Ischnosoma nepalicum (Coiffait) in Nepal (material examined and literature records).

FIGURES 25–31. Extruded internal sac of aedeagus from lateral view (25–27), apical portion of male sternite VII with position of dark long setae (28–30), apical portion of male sternite VIII (31). Ischnosoma jumla sp. n. (25), I. nepalicum (26), I. nepalense (27), I. quadriguttatum quadriguttatum (28), I. travei (29, 31), I. gratiosum (30). Scale bars: a (Figs 28–31), b (Figs 25–27).

FIGURES 32–39. Male sternite VIII with position of dark setae, beard-like palisade setae and median dense setae, schematic. Ischnosoma iob (32), I. jumla sp. n. (33), I. jaljalense (34), I. fasciatocolle (35), I. nepalense (36), I. nepalicum (37), I. ephraim (38), I. thamar (39). Scale bar: 0.1 mm.