Syzeuctus mongolicus, 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 : 1059-1061

Syzeuctus mongolicus nov.sp. ( Figs 7 , 19 , 43, 82, 127)

H o l o t y p e: (♀) "Mongolia-Gobi, 100 km SW Dalanzad-gad, Bayanzag, der. Saxaulus, 1.-2.VII 2003, J. Halada lg." (Linz).

P a r a t y p e s: (7♀♀ 11♂♂) labeled as on the holotype (Linz and coll. Riedel); (3♀♀ 3♂♂) " Mongolia, 6.-7.vii.2004, Bayankhongor prov., 130 km S Bayankhongor , N 45°03´E 100°59´, 1240 m, Orog Nuur, on Saxaulus, Jacub Strake leg." (Linz); (3♀♀ 1♂) "MGL-Bayankhongor, 130 km S Bayankhongor , N 45°03´E 100°59´, 1240 m ,, 6.VII.2004, M. Kadlecova lg." (Linz); (2♀♀ 7♂♂) "MGL-Bayankhongor, 130 km S Bayankhongor , N 45°03´E 100°59´, 1240 m ,, 6.VII.2004, J. Halada lg." (Linz); (♂) "Mongolia-SE Dornogov reg., 5.8.2007, 2 km SE Khuvsgol, J. Halada lg." ( Linz ) .

S t u d i e d m a t e r i a l: 15♀♀, 22♂♂; Mongolia *.

D e s c r i p t i o n: ♀: Body length 11-12 mm. Antenna with 35-36 flagellomeres, filiform; 1 st flagellomere 4.0× longer than wide and 0.44-0.46× as long as eye; preapical flagellomere 1.2-1.3× longer than wide. Temple strongly and roundly narrowed behind eye, dorsally c. 0.3× long as eye. OED 1.1× and OOD 1.9× ocellar diameter. Frons with scattered punctures, sides moderately swollen, with deep central impression and median longitudinal rim. Face with rather dense punctures, with parallel sides. Clypeus 2.3× wider than long, with very scattered punctures and with transversal central ridge; apical margin rounded. Mandible with wide ventral lamella; lower mandibular tooth small, 0.5× as long as the upper one. Malar space very narrow, MI 0.25-0.35. Genal carina slightly lamelliform ventrally, reaching mandibular base.

Mesosoma punctate, c. 1.5× longer than high. Frontoventral edge of pronotum strongly curved, lateral pronotal groove smooth. Speculum partly smooth. Epicnemial carina low, with low carinae on pleural and transversal parts. Propodeum with complete apical transversal carina. Hind femur 4.0-4.3× longer than wide; hind metatarsus 0.63× as long as hind femur. Hind tarsomeres with apical rows of bristles; 2 nd hind tarsomere about as long as 3 rd one. Hind claw with short teeth in basal 1/3-1/2, slightly bent apically. Areolet with long stalk; 2 nd recurrent vein slightly distal to its middle. Nervulus ± interstitial. Hairs on basal cell distinctly shorter than their intervals. Hind wing with 11-12 hamuli.

1 st tergite 1.6× longer than wide, with scattered punctures laterally. 2 nd tergite 1.0× as long as wide, with fine rather dense punctures. 3 rd tergite 1.0-1.05× wider than long, with dense punctures. Spiracles of basal tergites not protruding laterally. Ovipositor 1.0-1.3× longer than fore wing, 1.15-1.4× longer than metasoma and 2.7-3.0× longer than hind tibia.

Color: Yellow. Scape with brown stripe dorsally. Flagellum except blackish basal flagellomeres reddish-brown. Median stripe of face, stripes around ocelli and occiput, three stripes on mesoscutum, scuto-scutellar groove, margins of mesopleuron, stripe on mesosternum and two paramedian spots on propodeum black. Tergites black; 1 st tergite with wide basal and apical yellow bands; 2 nd to 4 th tergites with narrow basal and wide apical yellow bands; 5 th tergite with apical band. Legs yellow; stripe on hind coxa and hind trochanter entirely black; hind femur with brown stripe, hind tibia black in apical 1/5; tips of hind tarsomeres ± infuscate. Fore wing with distinct subapical brown spot;

pterostigma brown, cream-yellow proximally. ♂: Body length 10-12 mm. Antenna with 34-36 flagellomeres, filiform; 1st flagellomere

3.9× longer than wide; preapical flagellomere 1.5× longer than wide. Temple shortly parallel behind eye, strongly roundly narrowed apically. Ocelli large, OED 1.0-1.1× and OOD 1.8× ocellar diameter. Frons with scattered punctures, moderately swollen laterally, with deep central impression and median longitudinal rim. Face with rather dense punctures, with parallel or slightly divergent sides. Clypeus 2.3× wider than long, with very scattered punctures, apical margin rounded. MI 0.25-0.35. Genal carina slightly lamelliform ventrally, reaching mandibular base.

Frontoventral edge of pronotum strongly curved, lateral pronotal groove smooth. Speculum partly smooth. Epicnemial carina low, with low carinae on pleural and transversal parts. Propodeum with complete apical transversal carina. Hind femur 4.1× longer than wide; hind metatarsus 0.6× as long as hind femur. Hind tarsomeres with apical rows of bristles; 2 nd hind tarsomere 0.9-1.0× as long as 3 rd one. Hind claw without visible teeth, slightly curved apically. Areolet stalked; 2 nd recurrent vein slightly distal to its middle. Nervulus ± interstitial. Hairs on basal cell distinctly shorter than their intervals. Hind wing with 10-11 hamuli.

1 st tergite 1.9× longer than wide, with scattered punctures. 2 nd tergite about as long as wide, with rather dense punctures. 3 rd tergite 1.0-1.05× wider than long, with dense punctures.

Color: Yellow. Scape with brown stripe dorsally. Flagellum except blackish basal flagellomeres reddish-brown. Median stripe of face, stripes around ocelli and occiput, three stripes on mesoscutum, scutoscutellar groove, margins of mesopleuron, stripe on mesosternum and two paramedian spots on propodeum black. Tergites black; 1 st to 5 th tergites with wide apical yellow bands, apical band of 6 th tergite narrow; 1 st to 3 rd tergites with basal yellow bands. Legs yellow; stripe on hind coxa and hind trochanter largely black; hind femur with blackish stripe, hind tibia black in apical 0.2; tips of hind tarsomeres ± infuscate. Fore wing hyaline; pterostigma brown, cream-yellow proximally.

Hosts unknown.

Figures

Figs 7-9: Habitus of ♀♀ from dorsal: (7) Syzeuctus mongolicus nov.sp. HT, (8) S. longigenus UCHIDA, (9) S. rufigaster nov.sp. HT.

Figs 19-21: Habitus from lateral: (19) Syzeuctus mongolicus nov.sp. HT, (20) S. persicus nov.sp. HT, (21) S. longigenus UCHIDA.