Ichneumon megextensorius, Riedel, 2020

Riedel, Matthias, 2020, Contribution to the knowledge of Ichneumoninae of Siberia and Far East Russia (Hymenoptera, Ichneumonidae), Beiträge Zur Entomologie = Contributions to Entomology 70 (2), pp. 365-386 : 377-378

Ichneumon megextensorius spec. nov.

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( Figs 6 , 23 , 30 , 37 )

Holotype:  “ Russia Khabarovskiy kray, Boitsovo 20 km N Bikin, Kamenistaja Griva Hill, 47.02° N 134.25° E, 300 m, 27.V.1993, leg. A. Taeger ” ( SDEI).

Description: . Body length 16.3 mm. Flagellum slightly lanceolate, with 44 flagellomeres; 1 st flagellomere 1.85x longer than wide, c. 7 th flagellomere square, widest flagellomeres 1.8x wider than long; preapical flagellomere 0.7x as long as wide. Temple moderately and roundly narrowed behind eye, dorsally 0.75x as long as eye. Distance of lateral ocellus to eye 1.2x ocellar diameter. Frons coarsely rugose-punctate. Face densely punctate and shining. Clypeus densely punctate, shining; apical margin straight. Gena 1.2x wider than eye, with scattered punctures ventrally. Malar space as long as width of mandibular base. Mandible with two teeth, lower tooth smaller than upper one. Genal carina complete, reaching hypostomal carina away from mandibular base, both carinae low.

Mesosoma covered with pale greyish hairs. Notaulus distinctly impressed in frontal 1/6 of mesoscutum. Mesoscutum densely rugose-punctate, shining. Mesopleuron densely punctate, partly striate. Metapleuron coarsely rugose-punctate; juxtacoxal carina indistinct. Scutellum almost flat, 1.1x wider than long, with scattered punctures, without lateral carina. Propodeum coarsely rugose. Area superomedia almost rectangular, 1.4x longer than wide, rugose; costula absent. Area petiolaris rugose, with lateral carinae. Outer dentiparal edge without toothlike lamella. Hind coxa with dense punctures and large greyish scopa (length 1/3 of coxal length). Hind femur with scattered punctures in ventral 1/3, 3.6x longer than wide. Hind tibia with few external spurs.

Areolet pentagonal, frontal distance of intercubiti 3x their diameter; 2 nd recurrent vein distal to its middle. Nervulus postfurcal (2x its width).

Metasoma strongly oxypygous, hypopygium short. Postpetiolus strongly widened, lateral field 0.5x as wide as the median one; postpetiolus with regular fine aciculation. 2 nd tergite 1.2x wider than long. Gastrocoelus impressed, but widely smooth, with few short ridges; thyridium almost transverse, c. 0.8x as wide as the interval. 2 nd and 3 rd tergites finely and densely rugosepunctate, ± matte; 2 nd tergite with median longitudinal rugae in basal half. Following tergites granulate, shining. 2 nd to 3 rd sternites with median folds. Ovipositor sheath slightly extending behind metasomal apex.

Color: Black. Stripes of flagellomeres 8-14, scutellum and large median spots on 6 th and 7 th tergites ivory. Frontal orbit with narrow yellowish stripe (widened dorsally). Collare, hind edge of pronotum and tegula reddish. Small spot on subtegular ridge yellowish. 2 nd and 3 rd tergites red; 3 rd tergite with black band in apical 0.2. Legs black; fore and mid tibiae reddish frontally; hind trochantellus and narrow base of hind femur reddish; hind tibia reddish, black in apical 0.25; hind tarsus except red proximal half of metatarsus black. Wings with slight yellowish tint; pterostigma reddish.

: unknown.

Remark: This new species belongs to group E2 sensu HILPERT (1992). In the key of Siberian Ichneumon species ( RIEDEL, 2018) it runs to couplet 43: Ichneumon extensorius LINNAEUS , but differs by its larger size, longer flagellum with 44 flagellomeres, longer area superomedia, and black apical band of 3 rd tergite.

Figures

Figs 1–8: Habitus of: 1. Aoplus ocellator spec. nov. , 2. Chasmias paludator sibiricus subspec. nov., 3. Coelichneumon septenus TOWNES et al., new , 4. Protichneumon nigriventris spec. nov. , 5. Ichneumon flavocoxalis spec. nov., 6. Ichneumon megextensorius spec. nov., 7. Ichneumon pilocephalus spec. nov., , 8. Ichneumon taegeri spec. nov. .

Figs 21–23: Head from dorsal: 21. Ichneumon brevimaculatus spec. nov. : 22. Ichneumon flavocoxalis spec. nov. , 23. Ichneumon megextensorius spec. nov. , 24. Ichneumon flavotibialis spec. nov. – Figs 25–26: Protichneumon nigriventris spec. nov. : 25. Head from dorsal, 26. face.

Figs 27–34: Scutellum and propodeum: 27. Ichneumon brevimaculatus spec. nov. : 28. Ichneumon flavocoxalis spec. nov. , 29. Ichneumon polyxanthus (KRIECHBAUMER) , 30. Ichneumon megextentensorius spec. nov. , 31. Ichneumon pilocephalus spec. nov. , 32. Ichneumon flavotibialis spec. nov. , 33. Monontos baikalensis spec. nov. : 34. Protichneumon nigriventris spec. nov.

Figs 35–40: Basal tergites of: 35. Ichneumon brevimaculatus spec. nov. , 36. Ichneumon polyxanthus (KRIECHBAUMER) , 37. Ichneumon megextensorius spec. nov. , 38. Ichneumon pilocephalus spec. nov. , 39. Ichneumon flavotibialis spec. nov., 40. Monontos baikalensis spec. nov.