Tersilochus (Tersilochus) nigellus Khalaim & Lee, 2014

Khalaim, Andrey I., Balueva, Ekaterina N., Kim, Ki-Beom & Lee, Jong-Wook, 2014, Review of the genus Tersilochus Holmgren (Hymenoptera, Ichneumonidae, Tersilochinae) from South Korea, Journal of Hymenoptera Research 36, pp. 27-51 : 36-38

Tersilochus (Tersilochus) nigellus Khalaim & Lee sp. n. Figs 28-30

Description.

Female (holotype). Body length 5.1 mm. Fore wing length 3.8 mm.

Head strongly rounded behind eyes in dorsal view; temple 0.85 times as long as eye width. Inner eye orbits parallel. Mandible with upper tooth distinctly longer than lower tooth. Clypeus lenticular, 2.7 times as broad as long, in profile slightly convex, with lower 0.3 bent backwards; sparsely punctate, finely granulate, and dull in upper half. Malar space almost as long as basal width of mandible. Flagellum of antenna weakly tapered towards apex, with 21 segments in the holotype and 20 segments in the paratype ( Fig. 28 ); subbasal flagellomeres 1.3-1.5 times and subapical flagellomeres 1.2-1.3 times as long as broad; flagellomeres 4 to 7 with subapical finger-shaped structures on outer surface. Face, frons, vertex, and temple distinctly granulate and dull; face and frons of holotype also with indis tinct punctures. Mesosoma entirely granulate, dull, and mostly impunctate; mesopleuron finely and rather densely punctate on finely granulate background ( Fig. 29 ). Notaulus as very weak wrinkle or tubercle. Foveate groove weak and short, situated in anterior half of mesopleuron. Propodeum with basal keel, which is 0.31 times as long as apical area ( Fig. 30 ). Propodeal spiracle separated from pleural carina by 2.0-2.5 times diameter of spiracle ( Fig. 29 ). Apical area flat, anteriorly slightly pointed ( Fig. 30 ). Apical longitudinal carinae anteriorly weak. Fore wing with intercubitus longer than abscissa of cubitus between intercubitus and second recurrent vein. First abscissa of radius distinctly longer than width of pterostigma. Metacarpus not reaching apex of fore wing. Postnervulus intercepted below middle. Hind wing with nervellus vertical or slightly reclivous. Metasoma: first tergite 2.6 times as long as broad posteriorly, mostly smooth, with petiole slightly depressed, oval in cross-section, well separated from postpetiole in dorsal view, finely striate laterally before glymma. Glymma deep, situated in apical 0.6 of first tergite, joining by distinct furrow to ventral part of postpetiole. Second tergite as long as anteriorly broad ( Fig. 30 ). Thyridial depression short, transverse ( Fig. 30 ). Ovipositor evenly upcurved, thickened near apex, with deep and sharp dorsal subapical notch; sheath 1.25 times as long as first tergite.

Head, mesosoma, and first tergite black; palpi and lower 0.3 of clypeus reddish brown; mandible reddish brown with blackish base and teeth; tegula yellow. Antenna with scape and pedicel brownish black and flagellum entirely black. Pterostigma brown. Legs brownish yellow; fore coxa brown basally; mid and hind coxae brownish black; first trochanter of hind leg dark brown. Metasoma behind first tergite dark brown ventrally to brownish black dorsally.

Male. Unknown.

Comparison.

Similar to Tersilochus fidicinus sp. n. but differs by the longer malar space, finely punctate mesopleuron ( Fig. 29 ), propodeum with distinct basal keel ( Fig. 30 ), and shorter thyridial depression ( Fig. 30 ).

Variation.

Paratype almost exactly corresponds with the holotype with no obvious variation.

Type material.

Holotype female, South Korea, Jeonnam-do (JN), Jeongeup-si, Jangseong-gun, Bukha-myeon, Namchanggol, Malaise trap, Site 18, 19.V.2005, coll. D.K. Jung (YUG).

Paratype. 1 female (ZISP), South Korea, Gyeongbuk-do (GB), Cheongdo-gun, Maejeon-myeon, 35°40'N, 128°50'E, 17.IV.1992, coll. J.W. Lee.

Etymology.

Named after the Latin nigellus (somewhat black), on account of its almost entirely black body.

Figures

Figures 23 - 30. Tersilochus iracundus sp. n., female, holotype: 23 head, frontal view 24 mesosoma, ventrolateral view 25 fore wings 26 metasoma with ovipositor, lateral view 27 tergites 1 - 3 of metasoma, dorsal view. Tersilochus nigellus sp. n., female, holotype: 28 head with antenna and anterior part of mesosoma, lateral view 29 mesosoma, lateral view 30 propodeum and base of metasoma, dorsolateral view.