Syzeuctus altaicus, Riedel, 2021

Riedel, Matthias, 2021, The genus Syzeuctus FÖRSTER in the Western Palaearctic region and Central Asia (Hymenoptera, Ichneumonidae, Banchinae), with descriptions of 17 new species, Linzer biologische Beiträge 52 (2), pp. 1013-1098 : 1023-1024

Syzeuctus altaicus nov.sp. ( Figs 1 , 12 , 25, 57, 100)

H o l o t y p e: (♀) "S Siberia, Altai Mts, Sumultinsky Mt range, Karakol lake, 2000 m, 1-10 VII 2003, leg. Kartaskov" (coll. Riedel).

S t u d i e d m a t e r i a l: 1♀; Kyrgyzstan *. D e s c r i p t i o n: ♀: Body length 9 mm. Antenna with 31 flagellomeres, filiform ; 1st

flagellomere 5.1× longer than wide and 0.59× as long as eye; preapical flagellomere 1.2× longer than wide. Temple strongly and almost linearly narrowed behind eye, dorsally 0.55× as long as eye. OED 1.6× and OOD 2.7× ocellar diameter. Frons slightly protruding laterally and slightly impressed medially, with scattered punctures, shining. Face densely punctate, centrally protruding and partly rugose, inner eye margins parallel. Clypeus 2.0× wider than long, convex, with scattered punctures and rather long erected hairs; apical margin rounded. Lower mandibular tooth smaller than upper one. MI 0.8. Genal carina lamelliform elevated and slightly sinusoid ventrally, reaching mandibular base.

Mesosoma with coarse dense punctures, 1.3× longer than high. Frontoventral edge of pronotum strongly bent; lateral pronotal groove partly rugose. Epicnemial carina low, with pleural part, but without distinct carina on transversal part. Propodeum with complete apical transversal carina. Hind femur 4.6× longer than wide. Hind metatarsus 0.70× as long as hind femur. 2 nd hind tarsomere 1.25× longer than 3 rd one. Hind claw with 2-3 short basal teeth, moderately curved apically. Areolet stalked; 2 nd recurrent vein in its middle. Nervulus postfurcal by 1× its width. Hairs on basal cell slightly shorter or as long as their intervals. Hind wing with 8 distal hamuli.

Metasoma stout; 1 st tergite 1.3× longer than wide, with scattered setiferous punctures laterally, largely smooth medially. 2 nd tergite 1.2× wider than long, with rather dense

punctures. 3 rd tergite 1.2× wider than long, densely punctate. Ovipositor 0.85× as long as fore wing, 1.0× as long as metasoma and 2.0× longer than hind tibia.

Color: Black. Palps, mandibular base, clypeus and spot on gena reddish. Orbits (widened at vertex and shortly interrupted on gena), spot on collare, hook-shaped anterolateral spot on mesoscutum, tegula, subtegular ridge, sides and apex of scutellum and spot on fore coxa and trochanter yellow. 1 st tergite apically and 2 nd to 4 th tergites entirely reddish (2 nd and 4 th tergites with some brownish suffusion). Legs except black coxae and trochanters reddish; fore and mid legs yellowish frontally; hind tibia yellow in basal third and narrowly infuscate at apex; hind tarsus black, hind metatarsus and 2 nd hind tarsomere with median yellow stripes. Wings hyaline, without brown spots; pterostigma ochreous.

♂ and hosts unknown.

R e m a r k: This new species with complete apical transversal carina of propodeum is characterized by its stout metasoma, reddish basal tergites without yellow bands, ventrally lamelliform genal carina, rather short ovipositor and low number of flagellomeres.

Figures

Figs 1-6: Habitus of ♀♀ from dorsal: (1) Syzeuctus altaicus nov.sp. HT (holotype), (2) S. flagellator nov.sp. HT, (3) S. hyalinus nov.sp. HT, (4) S. flavator nov.sp. HT (♂), (5) S. frontator nov.sp. HT, (6) S. maroccanus nov.sp. HT.

Figs 12-15: Habitus of ♀♀ from lateral: (12) Syzeuctus altaicus nov.sp. HT, (13) S. flagellator nov.sp. HT, (14) S. frontator nov.sp. HT, (15) S. robustus TELENGA LT (lectotype).