Ichneumon sayanicus, Riedel, 2018

Riedel, Matthias, 2018, Contribution to the Siberian species of Ichneumon LINNAEUS (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 50 (2), pp. 1509-1562: 1528-1529

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Ichneumon sayanicus


Ichneumon sayanicus   nov.sp. ( figs 16 View Figs 13-16 , 37 View Figs 33-38 , 60 View Figs 57-60 , 79 View Figs 77-80 )

M a t e r i a l e x a m i n e d Holotype: ♀ "S Siberia, Hakassia, W Sayan Mts, Aradan mountain range, Buyba vill., 25.viii.1990, leg. V. Gromenko" (coll. Riedel).  

D e s c r i p t i o n Body length 14.5 mm. Antenna moderately lanceolate, with 42 flagellomeres, 1st flagellomere 1.5x longer than wide; 4 th flagellomere square, widest flagellomeres 0.57x as long as wide, preapical flagellomere 0.8x as long as wide. Temple moderately and roundly narrowed behind eye. OOD 1.6. Frons transversely rugose-punctate, finely granulate. Face densely punctate, smooth between punctures; clypeus with rather dense punctures, smooth between punctures. Gena 1.2x as wide as eye, with rather dense punctures in ventral 1/2. Malar space 1.15x as long as width of mandibular base and 1.25x as long as 1 st flagellomere. Genal carina complete, not interrupted ventrally. Hypostomal carina narrow.

Mesosoma covered with brownish hairs. Mesoscutum and mesopleuron densely punctate, smooth between punctures. Metapleuron coarsely rugose-punctate; coxal carina present. Scutellum slightly elevated, slightly wider than long, with scattered fine punctures. Area superomedia trapezoid, widest frontally, 1.1x wider than long; costula weakly indicated. Area petiolaris with lateral border defined by some irregular rugae in the apical half. Hind coxa densely punctate and granulate, without scopa or longitudinal edge. Hind femur 3.4x longer than wide, with scattered punctures in ventral 1/3. Hind tibia with c.4 denticular spurs apico-externally. Tarsomeres slender, 3 rd mid tarsomere 1.7x longer than wide.

Metasoma strongly oxypygous, hypopygium short. Postpetiolus strongly widened, medi- an field 1.4x wider than the lateral one, with fine aciculation. 2 nd tergite 0.70x as long as wide. Gastrocoelus impressed, with distinct ridges; thyridium slightly oblique, 0.7x as wide as the interval. 2 nd and 3 rd tergites densely punctate and finely granulate, but shining. 2 nd tergite with fine longitudinal rugosity medially. Ovipositor sheath slightly extending behind metasomal apex.

Color: Black. Ring of flagellomeres 8-13, scutellum and roundish, equally sized spots on 5 th to 7 th tergites ivory. Coxae and trochanters black; legs otherwise red; tips of hind tibia and hind tarsomeres slightly darkened. Wings almost hyaline, pterostigma reddishyellow.

Males unknown.

T a x o n o m i c a l r e m a r k This species belongs to group F sensu HILPERT (1992). It runs to Ichneumon subalpinus HOLMGREN   in his key but differs by the less strongly lanceolate flagellum and black head and mesosoma (except the ivory scutellum).


Royal British Columbia Museum - Herbarium