Syzeuctus longivalvator AUBERT , 1977

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 : 1055-1057

Syzeuctus longivalvator AUBERT, 1977 (Figs 40, 79, 124)

O r i g i n a l: Syzeuctus longivalvator AUBERT, 1977: 36-37

P a r a t y p e: (♀) " Paratype; Chernomorsk zapov. Smeny., Goloj Pristani, Kasparyan 1.7.974" (Lausanne), type studied.

S t u d i e d m a t e r i a l: 57♀♀, 63♂♂; Bulgaria *, Croatia *, Kazakhstan, Serbia *, Siberia, Turkey *, Ukraine.

D e s c r i p t i o n: ♀: Body length 11-13 mm. Antenna with 38-42 flagellomeres; 1 st flagellomere 4.3-4.5× longer than wide and 0.6× as long as eye; preapical flagellomere 1.3× longer than wide. Temple strongly and roundly narrowed behind eye, dorsally c. 0.35× as long as eye. OED 1.4-1.8× and OOD 2.4× ocellar diameter. Frons densely punctate, moderately swollen laterally and impressed medially. Face densely punctate, with parallel sides. Clypeus 1.7-2.1× wider than long, with scattered punctures, apical margin rounded. MI 0.65-0.85. Mandible with ventral lamella, lower tooth 0.5× as long as upper one. Genal carina lamelliform ventrally, reaching mandibular base.

Mesosoma 1.35× longer than high. Frontoventral edge of pronotum strongly curved; lateral pronotal groove smooth or punctate. Epicnemial carina slightly elevated, with denticular lamella on transversal part. Mesoscutum, mesopleuron including speculum and metapleuron densely punctate. Propodeum with complete apical transversal carina. Hind femur 5.0-5.6× longer than wide. Hind metatarsus 0.75× as long as hind femur. 2 nd hind tarsomere 1.35-1.4× longer than 3 rd one. Hind claw slender, densely pectinate and moderately bent apically. Areolet stalked; 2 nd recurrent vein in or slightly distal to its middle. Nervulus interstitial to postfurcal by 2× its width. Hairs on basal cell shorter than their intervals. Hind wing with 9 distal hamuli.

Metasoma slender. 1 st tergite 1.7-2.0× longer than wide, with scattered to rather dense punctures laterally. 2 nd tergite 1.3-1.4× longer than wide, with scattered to dense punctures. 3 rd tergite 1.2-1.3× longer than wide, with dense but fine superficial punctures. Ovipositor 1.6-2.0× longer than fore wing, 1.8-2.2× longer than metasoma and 4.0-4.5× longer than hind tibia.

Color: Black or dark reddish. Head mainly yellow and with dark median stripe of face and frons, dark stemmaticum and occiput OR with yellow mandible, clypeus, gena and wide orbits. Flagellum reddish, basal flagellomeres; scape and pedicel black. Mesosoma with very extensive yellow coloration: collare, lateral edge and upper margin of pronotum, tegula, subtegular ridge, hook-shaped anterolateral and central spots on mesoscutum, spots on mesopleuron, metapleuron and propodeum, scutellum except black anteromedian spot and postscutellum yellow. Metasoma black or 1 st to 3 rd tergites reddish-brown; often 1 st (and sometimes 2 nd) tergites yellow subbasally, 1 st /2 nd to 4 th /5 th tergites with yellow apical bands. Fore and mid legs yellow; coxae, femora and tibiae with dorsal brown stripes. Hind coxa, hind trochanter and hind femur yellow dorsally, black ventrally (or entirely reddish); hind trochantellus yellow; hind tibia and tarsus yellow, with dorsal brown stripes (often all tibiae with yellow basal bands). Fore wing with large subapical brown spot. Pterostigma brown, yellowish proximally.

♂: Body length 10-12 mm. Antenna with 36-43 flagellomeres, 1 st flagellomere 3.7-4.2× longer than wide and 0.6× as long as eye. Temple strongly and roundly narrowed behind eye, dorsally 0.4× as long as eye. OED 1.2-1.7× ocellar diameter. Stemmaticum and frons with superficial punctures. Frons moderately swollen laterally and impressed medially. Inner eye margins slightly divergent ventrally. Clypeus 1.8-2.0× wider than long, with scattered punctures. MI 0.9-1.1. Mandible with ventral lamella; lower tooth 0.5× as long as upper one. Genal carina reaching mandibular base.

Frontoventral edge of pronotum strongly curved, lateral pronotal groove smooth. Epicnemial carina low, with ± distinct dentiform lamella on transversal part. Apical transversal carina of propodeum complete. Hind femur 4.5-4.9× longer than wide. 2 nd hind tarsomere 1.2× longer than 3 rd tarsomere. Hind claw with short teeth. Areolet stalked, 2 nd recurrent vein in or distal to its middle. Nervulus slightly postfurcal by 1× its width.

1 st tergite 1.7-2.1× longer than wide, with rather coarse, scattered or dense punctures. 2 nd tergite 1.15-1.25× longer than wide, with fine rather dense punctures. 3 rd tergite 1.2- 1.25× longer than wide, with superficial punctures.

Color: Black or ± reddish. Palps, mandible except teeth, clypeus except dorsal margin, face except central black stripe, malar space, gena and wide orbits yellow. Mesosoma with extended yellow coloration. Tergites black or 1 st to 5 th tergites ± reddish; 1 st to 6 th tergites with wide apical yellow bands; 1 st tergite with subbasal yellow spot. Fore and mid coxae and trochanters mainly yellow; hind coxa yellow dorsally and apicoventrally; hind trochanter reddish, hind trochantellus yellow. Legs yellowish, with dorsal reddish stripes; hind femur yellow with ventral red stripe. Wings hyaline, pterostigma brown, yellow in proximal third.

Hosts unknown.