Syzeuctus genator Riedel 2022, nov.sp.
Creators: name: Riedel, Matthias
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Syzeuctus
Syzeuctus genator

description: Syzeuctus genator nov.sp. (figs 6, 12, 18, 23)
H o l o t y p e: (♀) N Vietnam: Viet Try, nr Thanh Son, Thuong Cuu, 20°59´N 105°8´E, 350-400 m, 11-16.x.1999, Malaise trap, R. de Vries, RMNH´99 (Leiden).
D e s c r i p t i o n: ♀: Body length 12 mm. Length of fore wing 9 mm. Length of ovipositor 7.5 mm. Antenna with 42 flagellomeres; 1 st flagellomere 5.2× longer than wide and 0.66× as long as eye; preapical flagellomere about square. Temple short, strongly and roundly narrowed behind eye, dorsally 0.25× as long as eye. OED 1.4× and OOD 1.4× ocellar diameter. Vertex densely punctate. Frons with scattered to rather dense punctures, moderately swollen laterally and impressed medially. Face densely punctate, inner eye margins parallel. Clypeus 1.6× wider than long, with fine dense punctures, apical margin rounded. MI 1.0. Mandible with baso-ventral lamella, upper tooth about as large as lower one.
Mesosoma coarsely and densely punctate, covered with short pale setae, 1.75× longer than high. Fronto-ventral edge of pronotum strongly curved. Side of pronotum densely punctate, pronotal groove finely rugulose. Epicnemial carina low, pleural part present, transversal part absent. Mesopleuron densely punctate; speculum partly smooth. Propodeum coarsely rugose-punctate, laterally with oblique striae. Pleural carina weak and incomplete. Apical transverse carina of propodeum strong and complete. Hind femur 5.3× longer than wide. Hind metatarsus slender, 0.75× as long as hind femur. 2 nd hind tarsomere 1.38× as long as 3 rd tarsomere. Hind claw with 4 long teeth, strongly bent apically.
Areolet with long stalk; vein 2m-cu reaching areolet in its distal 0.8. Vein 1cu-a postfurcal by 2× its width. Postnervulus intercepted behind its middle. Nervellus of hind wing reclivous, intercepted in its apical 0.8. Hind wing with 10 distal hamuli.
Metasoma rather stout, tergites with narrow spiracles, spiracles not bulged. 1st tergite 1.6× longer than wide, smooth medially, with scattered lateral punctures. 2 nd tergite 1.1× longer than wide, with fine rather dense punctures. 3 rd tergite 1.1× longer than wide, with fine superficial dense punctures. Ovipositor 0.8× as long as fore wing, 1.0× as long as metasoma and 2.3× longer than hind tibia.
Color: head and mesosoma mainly yellow. Antenna black. Dorso-median spot on face, frons medially, stemmaticum and occiput, pronotum medially, mesoscutum except large yellow hook-shaped antero-lateral stripes and central rectangular spot, epicnemium and postero-dorsal stripe on mesopleuron and two oblique lateral stripes on propodeum black. Tergites with blackish median transversal bands; 1 st to 3 rd tergites otherwise yellow, 4 th to 7 th tergites otherwise cream-yellow. Sternites yellowish; hypopygium with brown postero-median spot. Legs yellow; hind coxa basally and hind trochanter entirely black; tibiae ochreous; fore and mid tarsi brownish; hind tarsus black. Fore wing weakly infuscate apically; pterostigma reddish-brown.
♁ unknown.
R e m a r k: This new species belongs to the zanthorius group sensu CHANDRA & GUPTA (1977) and runs to S. zanthorius (CAMERON, 1902) in their key. It differs by its stouter basal tergites, yellow femora and more extensive yellow coloration of head, mesosoma and metasoma.
description: Published as part of Riedel, Matthias, 2022, Contribution to the knowledge of Oriental Syzeuctus FÖRSTER (Hymenoptera, Ichneumonidae, Banchinae), with description of six new species, pp. 257-273 in Linzer biologische Beiträge 54 (1) on pages 264-265, DOI: 10.5281/zenodo.7507419