Torymus wanggyui Matsuo, 2020

Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), Zootaxa 4758 (3), pp. 401-441 : 434-439

Torymus wanggyui Matsuo n. sp.

Figs 4d , 7 g–h, 23a–d, 25f

Etymology. The specific name honors Dr. Wanggyu Kim who first reared this species and studied its host gall midge.

Type material. Holotype: ♀ ( BLKU), emerged on 23 April 2012 from a gall of Macrodiplosis selenis on Quercus serrata collected by W. Kim on 4 November 2011 from Mitsusawa, Ogori, Fukuoka, Japan. Paratypes: 5 ♀, same data as the holotype ( BLKU); 1 ♀ and 3 ♂, emerged on 24 March 2012 from galls of Macrodiplosis selenis on Quercus serrata collected by N. Gyotoku from Mitsusawa, Ogori, Fukuoka, Japan ( BLKU); 3 ♂, emerged on 17 April 2012 from galls of Macrodiplosis selenis on Quercus serrata collected by W. Kim on 4 November 2011 from Mitsusawa, Ogori, Fukuoka, Japan ( BLKU).

Description. Female. Body length excluding ovipositor sheath 2.3–2.5 mm. Head bluish green. Scape yellowish brown but darker apically; pedicel and flagellum brown. Mesosoma bluish green. Fore wing hyaline. Fore and mid coxae brownish yellow sometimes bluish green; hind coxa bluish green. All femora and tibiae brownish yellow. Metasoma bluish green ( Fig. 4d ).

Head 1.9–2.1× as wide as long in dorsal view; temple 0.2× as long as dorsal length of eye; POL 2.6–2.7× OOL; OOL 0.8–0.9× OD. Head 1.1–1.2× as wide as high in frontal view ( Fig. 23a ); eyes separated by 0.9–1.0× their height; malar space 0.3–0.4× height of eye; mouth 2.1–2.2× malar space; clypeus with apical margin produced, truncate medially. Antenna clavate ( Fig. 7g ); scape 0.6–0.7× as long as height of eye, not reaching anterior ocellus; combined length of pedicel and flagellum 1.3–1.4× width of head; pedicel 1.8–2.0× as long as wide; anellus 1.3–1.5× as wide as long; F1 1.2–1.5× as long as wide, as long as pedicel; F2 1.2× as long as wide; F3–F5 1.0–1.1× as long as wide; F6–F7 0.9–1.0× as long as wide; each funicular segment bearing longitudinal sensilla arranged in irregular one or two rows; a stripe of micropilosity extends C2 and C3.

Mesosoma 1.8–2.0× as long as wide; mesoscutum ( Fig. 23b ) with small piliferous punctures; sculpture on mesoscutum in anterior half transversely reticulate; notaulus shallow; scutellum ( Fig. 23c ) 1.2–1.4× as long as wide, sculptured as mesoscutum; dorsellum with a median carina; propodeum ( Fig. 23d ) with superficial striae; lower mesepimeron 1.0–1.2× as long as wide. Fore wing ( Fig. 25f ) 2.5–2.7× as long as wide; costal cell 9.0–10.0× as long as wide, on upper surface with a setal row in distal half, on lower surface with a setal row which is broken medially and scattered setae distally; basal cell widely opened below, bare; cubital setal line with a few setae; basal setal line present; speculum widely opened below; relative lengths of marginal vein: postmarginal vein: stigmal vein=6.9: 1.5: 1.0. Hind coxa 2.0–2.2× as long as wide, with dorsal carina basally; dorsal surface of hind coxa bare in basal half; hind femur 4.3–4.7× as long as wide; hind tibia with longer spur 1.0–1.2× as long as width of hind tibia, 0.4–0.5× length of basitarsus; shorter spur 0.6–0.8× length of longer spur.

Metasoma as long as mesosoma; posterior margin of metasomal tergum five incised; tip of hypopygium situated at 0.6 length of metasoma; ovipositor sheath as long as 2/3 mesosoma, 1.0–1.1× as long as hind tibia.

Male. Differs from female as follows: Antenna stouter than that of female ( Fig. 7h ); scape bluish green; anellus transverse, twice as wide as long; Relative lengths of marginal vein: postmarginal vein: stigmal vein=5.5: 1.5: 1.0. Hind femur bluish green medially. Metasoma with coppery tint; posterior margin of metasomal tergum five entire.

Distribution. Japan (Kyushu).

Host information. Torymus wanggyui is an ectoparasitoid of Macrodiplosis selenis Kim and Yukawa ( Diptera : Cecidomyiidae ) that induces leaf galls on Quercus serrata Murray (Fagaceae) (gall photo: fig. 27h).

Remarks. Females of T. wanggyui are similar to T. chrysocephalus Boheman , a European species ( Graham & Gijswijt 1998), because of the following shared features: antenna clavate; a stripe of micropilosity extends length of C2 and C3. However, females of T. wanggyui can be distinguished from T. chrysocephalus by having the following features: ovipositor sheath shorter than metasoma (as long as metasoma in T. chrysocephalus ); eyes without distinct setae (with distinct setae in T. chrysocephalus ); POL 2.6–2.7× OOL (POL 1.2–1.4 OOL in T. chrysocephalus ); OOL 0.8–0.9× OD (OOL 1.5–2.0 OD in T. chrysocephalus ).

Figures

FIGURE 4 a–d. ♀, lateral view. a, T. sasae; b, T. sawadai; c, T. sinensis; d, T. wanggyui.

FIGURE 7 a–h. Antenna. a, T. rugosus ♀; b, T. rugosus ♂; c, T. sasae ♀; d, T. sasae ♂; e, T. sawadai ♀; f, T. sawadai ♂; g, T. wanggyui ♀; h, T. wanggyui ♂. Scale lines 0.25 mm.

FIGURE 23 a–d. T. wanggyui ♀. a, head, frontal view; b, mesoscutum, dorsal view; c, scutellum, dorsal view; d, propodeum, dorsal view.

FIGURE 25 a–f. ♀ fore wing upper surface. a, T. minamii; b, T. quernus; c, T. rugosus; d, T. sasae; e, T. sawadai; f, T. wanggyui. Scale lines 0.5 mm.