Syzeuctus takaozanus Uchida, 1928

Kang, Gyu-Won, Kolarov, Janko & Lee, Jong-Wook, 2020, Review of the genus Syzeuctus (Hymenoptera, Ichneumonidae, Banchinae) from South Korea, Journal of Hymenoptera Research 80, pp. 17-30 : 17

Syzeuctus takaozanus Uchida, 1928

Fig. 4

Syzeuctus takaozanus Uchida, 1928: 95. Lectotype: ♀, TL: Japan, TD: HU.

Description.

Male. Body 13.0 mm in length. Fore wing 8.0 mm in length (Fig. 4A ).

Head in dorsal view flat with temple narrowed at an angle of about 45°, round (Fig. 4C ). Face convex, densely and coarsely punctate, without swelling. Clypeus flat, with long and thin setae, apically convex (Fig. 4B ); clypeal fovea open. Mandible moderately stout, strongly tapered, upper tooth slightly longer than lower tooth; lower ridge not developed. Maxillary palp with five segments. Frons smooth and convex with dense punctures. Vertex more sparsely and finely punctate than face. Occipital carina complete, slightly sinuous, joining hypostomal carina at mandibular base. Temple polished and convex with fine punctures. Malar space about 0.6 times as long as basal mandibular width. Inner margin of eye parallel. Antenna filiform with 42 flagellomeres; first flagellomere 3.0 times as long as its width, 2.0 times as long as second flagellomere.

Mesosoma with dense and short setae (Fig. 4D ). Pronotum with punctures entirely, not fused; upper posterior margin hook-shaped. Mesopleuron with epicnemial carina reaching medially; uniformly punctate, except medially where it is polished and impunctate; punctures bigger than on pronotum; postpectal carina absent. Metapleuron with dense punctures. Submetapleural carina complete, anterior half strongly developed. Mesoscutum polished, irregularly densely punctate, notaulus absent. Scutellum, in profile, slightly convex, densely punctate. Propodeum in dorsal view stout; closely punctate with long and dense setae; only posterior transverse carina completely developed; spiracle of propodeum oval. Legs slender. Fore tibial spur sinuate. Fore and mid tarsal claws pectinate. Ratio of hind tarsal segments 4.8:2.5:1.7:1.0:1.3; hind tarsal claw simple. Hind wing with seven hamuli.

Metasoma elongate with shallow and dense punctures (Fig. 4H ). First tergite 3.1 times as long as posterior width (Fig. 4F ), without lateral longitudinal carina. Second tergite coriaceous, 1.6 times as long as posterior width.

Color black with yellow marks.

Head black. Clypeus yellow. Frontal orbit with yellow spot. Genal orbit medially yellow. Antenna brown with black scape and pedicel. Tegula yellow. Upper margin of mesopleuron with yellow longitudinal mark. Mesoscutum with small anterior yellow spot on each side. Scutellum yellow, except black triangular mark anteriorly. Propodeum, in dorsal view, with small yellow spot on each side of anterior part; 凸-shaped yellow mark posteriorly (Fig. 4E ). Fore wing infuscate apically (without any spots) (Fig. 4G ). Fore leg yellow with brown tarsal claw. Mid leg yellow with black coxa ventrally and tarsal claw. Hind coxa and trochanter black; trochantellus yellow; femur brown; tibia and tarsus yellow with black apically; tarsal claw black.

Material examined.

South Korea: 1♀, [CN] Daejeon Dong-gu yongundong Daejeon Univ. , 18 May-14 Jun. 2007, J. W. Lee leg. ; 1♀, [GB] Gyeongsansi Daedong Yeungnam Univ. , 1125 Jun. 2009, J. W. Lee leg. ; 1♀, [GG] An-yang-si Man-an-gu Kwan-ag [Arb], 924 Jun. 2007, J. O. Lim leg .. China: 1♂, Jirin, Yanbian Hunchun , 21 Jul. 2010, J. W. Lee leg.

Distribution.

South Korea (new record), China (Henan, Liaoning), Japan.

Remarks.

The male specimen is newly described based on the Chinese specimen. Syzeuctus takaozanus and S. sambonis are similar because of the entirely black body, and easily distinguished from other Syzeuctus by the complete posterior transverse carina of the propodeum ( Sheng et al. 2013; Uchida 1928). These two species are easily distinguished from each other by the color of the face: female S. takaozanus has an entirely black face, while S. sambonis has a yellow face with a black spot ( Sheng et al. 2013). Furthermore, these two species differs by the presence ( S. sambonis ) or absence ( S. takaozanus ) of the pleural carina. By these characters, females and males of S. takaozanus are easily associated. Unlike the male, the female of S. takaozanus has an entirely black body and weakly infuscate wings apically.

Figures

Figure 4. Syzeuctus takaozanus Uchida, male A habitus in lateral view B head in frontal view C head in dorsal view D thorax in lateral view E propodeum in dorsal view F first tergite in dorsal view G wings (left) H abdomen in dorsal view. Scale bars: 1.0 mm (A), 0.2 mm (B-F), 0.5 mm (G, H).