Torymus sawadai Matsuo, 2020

Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), Zootaxa 4758 (3), pp. 401-441 : 432-433

Torymus sawadai Matsuo n. sp.

Figs 4b , 7 e–f, 21a–d, 25e

Etymology. The specific name honors Mr. Souichiro Sawada who first reared this species.

Type material. Holotype: ♀ ( BLKU), emerged on 23 July 2009 from a gall of Asphondylia sphaera on Weigela hortensis collected by S. Sawada on 12 July 2009 from Oikomi, Kyouwa, Hokkaido, Japan. Paratypes: 1 ♂, emerged on 20 July 2009 from a gall of Asphondylia sphaera on Weigela hortensis collected by S. Sawada on 12 July 2009 from Oikomi, Kyouwa, Hokkaido ( BLKU); 1 ♀, emerged on 27 July 2009 from a gall of Asphondylia sphaera on Weigela hortensis collected by S. Sawada on 12 July 2009 from Oikomi, Kyouwa, Hokkaido ( BLKU).

Description. Female. Body length excluding ovipositor sheath 3.2–3.5 mm. Head bluish green. Scape yellowish brown but darker apically; pedicel and flagellum black. Mesosoma bluish green. Fore wing hyaline. All coxae and hind femur concolorous with mesosoma; fore femur and mid femur yellowish brown; fore tibia and mid tibia yellowish brown; hind tibia brown. Metasoma bluish green with bluish tint ( Fig. 4b ).

Head 2.1–2.2× as wide as long in dorsal view; temple 0.2× as long as dorsal length of eye; POL 2.7–2.8× OOL; OOL 0.9× OD. Head 1.2–1.3× as wide as high in frontal view ( Fig. 21a ); eyes separated by 0.8–0.9× their height; malar space 0.2–0.3× height of eye; mouth 2.3–2.5× malar space; clypeus with apical margin produced, truncate medially. Antenna stout ( Fig. 7e ); scape 0.5–0.6× as long as height of eye, not reaching anterior ocellus; combined length of pedicel and flagellum 1.0–1.1× width of head; pedicel 1.4–1.5× as long as wide; anellus 1.1–1.3× as wide as long; F1 quadrate, shorter than pedicel; F2 quadrate; F3–F5 0.7–0.8× as long as wide; F6–F7 0.6–0.7× as long as wide; each funicular segment bearing longitudinal sensilla arranged in two rows; C3 with a small tuft of micropilosity beneath.

Mesosoma 1.5–1.6× as long as wide; mesoscutum ( Fig. 21b ) with small piliferous punctures; sculpture on mesoscutum in anterior half transversely reticulate; notaulus shallow; scutellum ( Fig. 21c ) 1.2–1.3× as long as wide, sculptured as posterior part of mesoscutum; dorsellum with a median carina; propodeum ( Fig. 21d ) with superficial reticulation, smoother medially; lower mesepimeron 1.3× as long as wide. Fore wing ( Fig. 25e ) 2.3–2.4× as long as wide; costal cell 8.3–8.5× as long as wide, on upper surface with a complete setal row, on lower surface with a complete setal row and scattered setae; basal cell closed, with a few setae below submarginal vein; cubital setal line present; basal setal line present; speculum closed below; relative lengths of marginal vein: postmarginal vein: stigmal vein=9.7: 3.2: 1.0. Hind coxa stout, 1.7× as long as wide, with dorsal carina basally; dorsal surface of hind coxa with a few short setae in basal half; hind femur 3.6–3.8× as long as wide; hind tibia with longer spur 1.6–1.8× as long as width of hind tibia, 0.5× length of basitarsus; shorter spur 0.6–0.7× length of longer spur.

Metasoma as long as mesosoma; posterior margin of metasomal tergum five incised; tip of hypopygium situated at 0.8 length of metasoma; ovipositor sheath slightly shorter than mesosoma, 1.5× as long as hind tibia.

Male. Differs from female as follows. Body length 3.0 mm. Antenna stouter than that of female ( Fig. 7f ); scape bluish green; pedicel 1.2× as long as wide; anellus transverse, 2.7 as wide as long; F1 0.7× as long as wide; F2–F7 0.6× as long as wide; longitudinal sensilla on each funicular segment arranged in one row. Relative lengths of marginal vein: postmarginal vein: stigmal vein=6.4: 2.2: 1.0. Mid femur and hind tibia darkened medially. Metasoma with coppery tint; posterior margin of metasomal tergum five entire.

Distribution. Japan (Hokkaido).

Host information. Torymus sawadai is an ectoparasitoid of Asphondylia sphaera Monzen ( Diptera : Cecidomyiidae ) that induces galls on Weigela hortensis (Siebold et Zucc.) K. Koch (Caprifoliaceae) (gall photo: fig. 27g, D–061 of Yukawa & Masuda 1996).

Remarks. Females of T. sawadai is similar to T. centor Graham and Gijswijt , which is recorded from United Kingdom ( Graham & Gijswijt 1998), by having the following shared features: clypeus with apical margin, narrowly truncate; antennal scape not reaching anterior ocellus; temple about 0.2× as long as dorsal length of eye; ovipositor sheath slightly shorter than metasoma; hind tibia with longer spur 1.6–1.8× as long as width of hind tibia, about 0.5× length of basitarsus; costal cell of fore wing on upper surface with a complete setal row; basal cell closed. However, females of T. sawadai can be distinguished from T. centor by having the following features: dorsellum with a median carina (without a median carina in T. centor ); dorsal surface of hind coxa with a few setae (fairly thickly setose in basal half in T. centor ); pedicel stouter, 1.4–1.5× as long as wide (twice as long as wide in T. centor ); F3–F6 transverse (quadrate in T. centor ); each segment bearing longitudinal sensilla arranged in two rows (one row in T. centor ); mouth 2.3–2.5× malar space (1.9× malar space in T. centor ); POL 2.7–2.8× OOL (2.2× OOL in T. centor ); OOL 0.9× OD (1.3× OD in T. centor ).

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 21 a–d. T. sawadai ♀. 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.