Torymus matsunagae Matsuo, 2020

Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), Zootaxa 4758 (3), pp. 401-441 : 423-424

Torymus matsunagae Matsuo n. sp.

Figs 2d , 6d , 15 a–b, 24h

Etymology. The specific name honors Ms. Kiyoko Matsunaga who first collected this species.

Type material. Holotype: ♀ ( BLKU), ovipositing a gall of Aphelonyx glanduliferae on Querucus serrata collected by K. Matsunaga on 12 April 2011 from Hikarigaoka, Chikushino, Fukuoka, Japan.

Description. Female. Body length excluding ovipositor sheath 2.5 mm. Head dark green. Scape dark green; pedicel and flagellum black. Mesosoma dark green with reddish tint. Fore wing hyaline. All legs concolorous with mesosoma. Metasoma dark green with reddish tint ( Fig. 2d ).

Head 2.2× as wide as long in dorsal view; temple 0.3× as long as dorsal length of eye; POL 2.3× OOL; OOL 1.2× OD. Head 1.3× as wide as high in frontal view; eyes separated by their height; malar space 0.3× height of eye; clypeus with apical margin truncate. Antenna not clearly clavate ( Fig. 6d ); scape 0.5× as long as height of eye, not reaching anterior ocellus; combined length of pedicel and flagellum 1.1× width of head; pedicel 1.2× as long as wide; anellus 2.0× as wide as long; F1 0.9× as long as wide; F2–F5 0.7× as long as wide; F6–F7 0.6× as long as wide; each funicular segment bearing longitudinal sensilla arranged in two rows.

Mesosoma 1.6× as long as wide; mesoscutum ( Fig. 15a ) transversely reticulate; notaulus shallow; scutellum ( Fig. 15b ) 1.3× as long as wide; frenal line complete; frenal area with superficial reticulation, smoother medially; dorsellum with a median carina; propodeum ( Fig. 15b ) with distinct median carina and submedian carina; lower mesepimeron 1.3× as long as wide. Fore wing ( Fig. 24h ) 2.3× as long as wide; costal cell 11.0× as long as wide, on upper surface with a complete setal row, on lower surface with scattered setae; basal cell with a setal row below submarginal vein, closed below; cubital setal line present; basal setal line present; speculum narrowly opened below; relative lengths of marginal vein: postmarginal vein: stigmal vein=8.3: 2.0: 1.0. Hind coxa 2.0× as long as wide, without dorsal carina; dorsal surface of hind coxa bare in basal half; hind femur 4.3× as long as wide; hind tibia with longer spur 1.1× as long as width of hind tibia, 0.5× length of basitarsus; shorter spur 0.8× length of longer spur.

Metasoma as long as mesosoma; posterior margin of metasomal tergum five entire; tip of hypopygium situated at 0.8 length of metasoma; ovipositor sheath as long as 2/3 mesosoma, 1.1× as long as hind tibia.

Male. Unknown.

Distribution. Japan (Kyushu).

Host information. Torymus matsunagae is a parasitoid of Aphelonyx glanduliferae Mukaigawa ( Hymenoptera : Cynipidae ) that induces galls on Querucus serrata Murray (Fagaceae) (gall photo: fig. 27b, C–127 of Yukawa & Masuda 1996).

Remarks. Females of T. matsunagae are similar to T. notatus (Walker) , a European species ( Graham & Gijswijt 1998), because of the following shared features: frenal area with superficial reticulation, smoother medially; dorsal surface of hind coxa bare in basal half. However, females of T. matsunagae can be distinguished from T. notatus by the following shared features: propodeum with distinct median carina and submedian carina (without median carina in T. notatus ); each funicular segment bearing longitudinal sensilla arranged in two rows (one row in T. notatus ); ovipositor sheath 1.1× as long as hind tibia (2.0–2.3× as long as hind tibia in T. notatus ).

Figures

FIGURE 2 a–d. ♀, lateral view. a, T. brevicaudatus; b, T. hirtipennis; c, T. macrops; d, T. matsunagae.

FIGURE 6 a–g. Antenna. a, T. hirtipennis ♀; b, T. hirtipennis ♂; c, T. macrops ♀; d, T. matsunagae ♀; e, T. minamii ♀; f, T. minamii ♂; g, T. quernus ♀. Scale lines 0.25 mm.

FIGURE 15 a–b. T. matsunagae ♀. a, mesoscutum, dorsal view; b, scutellum, dorsal view.

FIGURE 24 a–h. ♀ fore wing upper surface. a, T. achyranthii; b, T. aciculatus; c, T. acutissimus; d, T. angustitemple; e, T. brevicaudatus; f, T. hirtipennis; g, T. macrops; h, T. matsunagae. Scale lines 0.5 mm.