Syzeuctus brevicaudus Watanabe & Riedel, 2024, sp. nov.
Creators: name: Watanabe, Kyohei
name: Riedel, Matthias
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Syzeuctus
Syzeuctus brevicaudus

description: Syzeuctus brevicaudus sp. nov.
(Figs 1 B, 2 B, 5 A–F)
Type series. Holotype:F, JAPAN, Honshu, Fukushima Pref., Tadami, Mt.Asakusa-dake, Numanotaira, Gonzaemonyachi, 13. VIII.–13. IX. 2020, Y. Okatsu & Y. Nakano leg., MsT (EUM).
Description. Female (n = 1). Body polished and covered with punctures and silvery setae; length 9.75 mm. Setae on head and mesosoma not exceptionally long and erect.
Head 0.65 × as long as wide. Combined length of clypeus and face 0.8 × facial width. Clypeus smooth ventrally, punctate dorsally, slightly convex in lateral view, without central transverse ridge. Face densely punctate, slightly convex medially in lateral view, with a pair of slight convexities just above of each anterior tentorial pit. Frons concave medially, with a pair of distinct convexities. Malar space 0.85 × as long as basal mandibular width. Genal carina low ventrally, reaching mandibular base. POL 1.1 × as long as OD. OOL 1.6 × as long as OD. Temple weakly roundly narrowed behind eye in dorsal view (Fig. 5 D). Antenna with 48 flagellomeres. FL I 3.3 × as long as maximum depth in lateral view and 1.5 × as long as FL II. Preapical flagellomere 1.2 × as long as maximum width.
Mesosoma coarsely and densely punctate, 1.6 × as long as maximum height. Pronotum with small smooth area on ventral part. Epomia present, its dorsal end not reaching dorsal margin (Fig. 1 B). Mesopleuron densely punctate; speculum with a small smooth area (Fig. 5 E). Epicnemial carina present latero-ventrally and ventrally, its dorsal end remote from anterior margin of mesopleuron, without angulation. Dorsal surface of propodeum without transverse rugae. Posterior transverse carina of propodeum absent. Fore wing length 7.0 mm. Areolet receiving vein 2m-cu near the middle, petiolated anteriorly; petiole as long as areolet (Fig. 5 F). Fore wing vein 1cu-a subvertical, slightly postfurcal to vein M&RS. Nervellus reclivous, intercepted slightly posterior to the middle. Hind femur 5.3 × as long as maximum depth in lateral view. Ratio of length of first to fifth hind tarsomeres 4.2: 2.0: 1.5: 0.75: 0.95. Hind tarsal claws pectinate by short teeth, moderately bent apically (less than 90°) (Fig. 2 B).
Metasoma. T I 2.3 × as long as maximum width, smooth except for subapical part finely and sparsely punctate. T II 1.3 × as long as maximum width. T II to T V finely punctate. Ovipositor sheath 0.85 × as long as hind tibia, ca. 0.3 × as long as fore wing, and shorter than body length.
Colouration (Figs 5 A–F). Body (excluding wings and legs) reddish-yellow. Clypeus, face, malar space, inner and outer orbits, mandible except for teeth, palpi, propleuron, fore and mid legs, membranous part of metasomal sternites, and subgenital plate yellow. Ventral surface of scape, postero-dorsal corner and ventral part of pronotum, tegula, subtegular ridge, median longitudinal area of mesopleurou, apices of scutellum and postscutellum, postero-ventral part of metapleuron, and posterior part of propodeum tinged with yellow. Antenna largely brown. An anterior median longitudinal stripe of mesoscutum, an anterior longitudinal stripe of mesopleuron, lateral sides of laterotergites of T I to T III blackish-brown to black. Wings hyaline except for weakly clouded area of apical part of fore wing. Veins and pterostigma brown except for yellowish-brown wing base.
Male. Unknown.
Distribution. Japan (Honshu).
Etymology. The specific name refers to the short ovipositor.
Bionomics. Unknown.
Remarks. This species can be easily distinguished from all other Japanese species by the ovipositor distinctly shorter than hind tibia.
description: Published as part of Watanabe, Kyohei & Riedel, Matthias, 2024, Revision of the genus Syzeuctus Förster, 1869 (Hymenoptera, Ichneumonidae, Banchinae) from Japan, pp. 35-71 in Zootaxa 5496 (1) on pages 41-44, DOI: 10.11646/zootaxa.5496.1.2, http://zenodo.org/record/13331013