Nebria (Barbonebriola) tenuisulcata, C.Huber & J.Schmidt, 2017

Huber, Charles & Schmidt, Joachim, 2017, Notes on the Nebria subgenus Epinebriola K. DANIEL, 1904 with the description of Barbonebriola subgen. nov. and 13 new species from the Himalaya-Tibet orogen (Coleoptera, Carabidae, Nebriini), Contributions to Natural History 36, pp. 1-85 : 23-26

Nebria (Barbonebriola) tenuisulcata sp. nov. ( Fig. 12 )

Holotype ♀: Nepal, Mahakali /Darchula , 12 km N Ghusa, high valley SSW Api , 4100 m, 29°56'28" N, 80°54'24" E, stone debris, 8.VI.2005, leg. A. Weigel ( NME).

Body length 11 mm. Colour dark brown. Mandibulae and appendages of head piceous. Antennae brown, basal antennomeres not darkened. Legs brown, femur darkened.

Head behind the eyes with a shallow, faintly punctate transverse impression. Eyes prominent. Labrum long, with anterior margin faintly convex, bearing six setae; anterior margin in the area of the four median setae bulging. Angles of the labrum rounded. Apical margin of clypeus faintly concave. Head supraorbitally longitudinally wrinkled. Frons distinctly transversally wrinkled. 1–2 supraorbital seta. Antennae long and slender extending to one third of the elytra. Antennal scape elongate, subcylindrical-ovoid, basally narrowed, as long as the eye's diameter, with one dorsal seta. 2 nd antennomere with one seta ventroapically. Maxillary stipes laterally with a berry-like bulge with 8–9 tubercles bearing each a robust seta. Penultimate labial palpomere trisetose. Ligula spiny, with two lateral setae. Mentum with bifid medial tooth. Submentum with a row of 18 setae. Microreticulation of the head isodiametric.

Pronotum narrow, ratio width/length of the pronotum = 1.29. Lateral margin convex, narrowed basally, rounded to the anterior angles, evenly and rectilinearly narrowed to the posterior angle ( Fig. 15D ). Anterior angles slender and protruding, acutely rounded. Posterior angles distinctly narrower than the anterior ones. Lateral explanation narrow with a shallow groove, broadened basally. Lateral channel narrow. Lateral margin basally blade-like, obliquely upturned. Posterior angles acute. Anterior angles acutely rounded, distinctly protruding. Basal margin bisinuate, with a deep incision towards the basal fovea, giving the impression of a strongly protruding posterior angle. Pronotal disc convex, shallow. Basal fovea deep, anterior and posterior transverse sulci shallow, median line shallow. Basal fovea, anterior and posterior transverse sulci and the narrow lateral groove sparsely and faintly punctate. Apical margination of the pronotum restricted to lateral one-thirds, merges with the apex of the anterior angle. Base of the pronotum not margined. Basolateral and midlateral setae absent. Microreticulation of the pronotum isodiametric, impunctate on disc. Proepisternum scarcely punctate. Prosternal process elongate, with a faint longitudinal bulge, margined laterally and unmargined at apex.

Elytral silhouette convex, ovoid-elongate, narrowed basally, widest behind the middle; subapically faintly sinuated. Elytral apex acuminate, but rounded. Basal margination straight, smoothly merged with the lateral margination. Humeral carina faintly developed. Striae moderately deepened, distinct on disc, coarsely and tightly punctate. Striae obliterate towards the lateral margin and towards the apex. Apical carina absent. Intervals flat; intervals 3, 5 and 7 asetose. Scutellar seta absent. Microreticulation oblong. Mesepisterna punctate. Metepisterna 1.6 times as long as wide, punctate. Metacoxa with two basal and one apical setae.

Sternum 2 laterally smooth and finely punctate. Sternum 3 with a row of four medial setae. Sterna 4–6 each with 4–7 posterior paramedial setae. Anal sternum with two paramedial setae in the female. All sterna with faint impressions laterally.

Legs long and slender. Tarsi dorsally glabrous. Ventroapical tooth of the metatarsomere 4 small. Meso- and metatarsomeres 2–4 ventroapically with long setae. All tarsomeres 5 ventrally with two rows of four short setae. Metatarsomere 5 as long as the metatarsomeres 3+4.

Female genitalia: Gonocoxa ( Fig. 9D ): Gonocoxite 2 slender and long, longer than half the length of gonocoxite 1, slender at base, slightly narrowing near base, parallel or subparallel sided in median part, narrowing towards apex which is faintly deflected. Apex rounded, distinctly arcuate dorsally, but dorsally not grooved. Ventral preapical insertion furrow short-oval, with two nematiforme setae. Gonocoxites ventrally unjointed and continuously sclerotized, dorsally separated by a membranous area.

Male unknown.

Body ratios: hea.w/fro.w = 1.43; prm.w/hea.w = 1.25; prm.w/prp.w = 1.61; pra.w/prp.w = 1.18; ely.w/prm.w = 1.74; prm.w/prm.l = 1.35; ely.l/ely.w = 1.57.

Etymology: The specific epithet refers to the narrow lateral groove of the pronotum (tenuis, latin = thin, fine; sulcatus, latin = grooved).

Diagnosis: N. tenuisulcata sp. nov. is separable from all Barbonebriola species by the slender pronotum, by the absence of both lateral and basolateral setae of the pronotum and by the narrow lateral groove of the pronotum.

Distribution ( Fig. 16 , Nr. 9): Known only from the type locality on the southern slopes of the Api Himal in Farwestern Nepal.

Habitat ( Fig. 13 ): Stone debris with small vegetation and little rivulets.

Figures

Fig. 12: Nebria (Barbo- nebriola) tenuisulcata sp. nov. Holotype. Scale bar = 5 mm.

Fig. 15: Left part of the pronotum of species of Barbonebriola subgen. nov. A: Nebria (Barbonebriola) barbata ANDREWES, 1929; B: N. (B.) ganeshi LEDOUx, 1984; C: N. (B.) rubostipes sp. nov.; D: N. (B.) tenuisulcata sp. nov.; E: N. (B.) kagmara sp. nov. Scale bar = 1 mm.

Fig. 9: Right gonocoxae of species of Barbonebriola subgen. nov. in ventral view. A: Nebria (Barbonebriola) barbata ANDREWES, 1929; B: N. (B.) ganeshi LEDOUx, 1984; C: N. (B.) rubostipes sp. nov.; D: N. (B.) tenuisulcata sp. nov.; E: N. (B.) kagmara sp. nov.; gc1 = gonocoxite 1, gc2 = gonocoxite 2, ra = ramus. Scale bar = 0.5 mm.

Fig. 16: Locations with occurrences of Nebria (Barbonebriola sp. nov.) species. 1: Lac de Gangabal, Kashmir Himalaya of India (N. barbata ANDREWES, 1929). 2: Lac de Gadsar, Kashmir Himalaya of India (N. barbata ANDREWES, 1929). 3: Sonamarg, Kashmir Himalaya of India (N. barbata ANDREWES, 1929). 4: Babussar Pass, Kashmir Himalaya of Pakistan (N. barbata ANDREWES, 1929). 5: Rama Lake, Kashmir Himalaya of Pakistan (N. barbata ANDREWES, 1929). 6: Rohtang Pass, Himachal Pradesh, India (N. ganeshi LEDOUx, 1984). 7: Badrinath, Uttarakhand, India (N. restricta LEDOUx & ROUx, 2005). 8: South slope of Api Himal, Ghusa, Nepal (N. tenuisulcata sp. nov.). 9: East slope of Saipal Himal, Sankha La, Nepal (N. rubostipes sp. nov.). 10: South slope of Kanjiroba Himal, Kagmara La, Nepal (N. kagmara sp. nov.).

Fig. 13: Type locality of Nebria (Barbonebriola) tenuisulcata sp. nov.: Far Western Nepal, Api Himal: High valley N Ghusa, 4100 m a.s.l. Photo: Andreas Weigel.