Anisobas vietnamensis, Riedel, 2023

Riedel, Matthias, 2023, New contribution to the Oriental species of Anisobas WESMAEL and Listrodromus WESMAEL (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 54 (2), pp. 625-639 : 627-628

Anisobas vietnamensis nov.sp. ( figs 2 , 8-12 )

H o l o t y p e: (♀) Vietnam: Th.a Thiê-Hu., Bach Ma National Park, near station, 16.19944°N 107.85828°E, 1401 m a.s.l., 06-Jun-2018 - 14-Jun-2018, S. Schmidt & Vu Van Lien leg., ZSM- HYM-S2773 (ZSM).

D e s c r i p t i o n: ♀: Body length 9.5 mm. Flagellum with 27 flagellomeres, filiform, all flagellomeres longer than wide; 1 st flagellomere 2.6× longer than wide. Temple short, parallel behind eye and distinctly narrowed apically. Distance between lateral ocellus and compound eye 1.2× ocellar diameter. Frons largely smooth, with fine punctures laterally. Face and clypeus not separated, both with dense punctures, shining; apical margin of clypeus blunt and straight. Malar space 0.8× as long as width of mandibular base. Mandible strong; lower tooth slightly smaller than upper one. Genal carina reaching mandibular base.

Mesosoma covered with whitish setae. Side of pronotum with superficial punctures and with some coarse rugae on caudal margin, collar with median longitudinal keel. Notaulus impressed in frontal 1/6 of mesoscutum. Mesoscutum with coarse dense punctures, shining. Mesopleuron and metapleuron with dense coarse punctures; speculum smooth and shining. Epicnemial carina low, reaching subtegular ridge dorsally. Juxtacoxal carina present. Scutellum moderately elevated, 1.3× wider than long, with rather dense punctures, without lateral carina. Propodeum completely carinate, apophysis absent. Area basalis short, slightly bulging forward medially. Area superomedia hexagonal, c. 1.4× wider than long; anterior transverse carina in its middle. Area petiolaris with transverse rugae and lateral carina. Hind coxa densely punctate, without scopa. Hind femur stout, 2.9× longer than wide, densely punctate; hind tibia with 2-3 denticular spines externally. Claws not pectinate. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 3× their diameter; vein 2m-cu slightly distad its middle. Vein 1cu- a interstitial.

Metasoma strongly amblypygous. Petiolus as high as wide. Postpetiolus moderately widened, without latero-median carina; median field slightly elevated, with dense rugose punctures; lateral field punctate. Gastrocoelus strongly impressed, with longitudinal ridges. Thyridium almost transverse, 0.7× as wide as the interval. 2 nd tergite 1.4× wider than long; 3 rd tergite 1.7× wider than long. 2 nd to 4 th tergites densely and coarsely punctate, shining; 4 th tergite ± smooth at apical margin. Ovipositor sheath not reaching behind metasomal apex.

Color: black. Flagellum black, reddish-yellow ventrally. Spot on mandible, clypeus except black apical margin, face, frontal orbit, long outer orbit, scape ventrally, collar and upper margin of pronotum, spot on tegula, subtegular ridge, side of scutellum, upper division of metapleuron, narrow apical bands of all tergites, fore and mid coxae and trochanters (except small basal brown spots) and dorsal spot on hind coxa ivory. Fore and mid femora, tibiae and tarsi yellowish-red; hind femur reddish, black in apical 0.2; hind tibia red, black basally and in apical 0.25; hind tarsus black. Wings hyaline; pterostigma black.

♁ unknown.

R e m a r k: This new species runs to A. celebensis HEINRICH in the key of Oriental Anisobas species ( HEINRICH 1975: 462-463). It differs from A. celebensis by its smaller size, higher number of flagellomeres, entirely yellow face and ventrally reddish flagellum.

Figures

Figs 1-2: Habitus from lateral: (1) Anisobas himalayanus nov.sp. ♁: (2) Anisobas vietnamensis nov.sp. ♀.

Figs 8-12: Anisobas vietnamensis nov.sp. ♀: (8) face, (9) head from dorsal, (10) pro- podeum, (11) basal tergites, (12) metasoma.