Torymus hirtipennis Matsuo, 2020

Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), Zootaxa 4758 (3), pp. 401-441 : 419-421

Torymus hirtipennis Matsuo n. sp.

Figs 2b , 6 a–b, 13a–d, 24f

Etymology. The specific name, hirtipennis , is Latin meaning “hairy wing”, in reference to this characteristic of the fore wing of this species.

Type material. Holotype: ♀ ( BLKU), emerged on 23–24 September 2009 from a gall of Schizomyia sasakii on Ilex crenata collected by K. Matsuo on 12 September 2009 from Akagawa, Kokonoe, Oita, Japan. Paratypes: 2 ♀ and 2 ♂, collected by K. Konishi on 25 September 2009 from Hitsujigaoka, Sapporo, Hokkaido, Japan ( BLKU)

Description. Female. Body length excluding ovipositor sheath 2.7–3.2 mm. Head green. Scape yellowish brown with apical tip darker; pedicel and flagellomeres dark brown. Mesosoma green. Fore wing hyaline. Fore and mid coxae yellowish brown; hind coxa yellowish brown apically; all femora and tibiae yellowish brown. Lateral part of metasoma with yellowish brown area which extends from base to half of metasoma ( Fig. 2b ).

Head 2.0–2.1× as wide as long in dorsal view; temple 0.1–0.2× as long as dorsal length of eye; POL 2.0–2.1× OOL; OOL 1.0–1.1× OD. Head 1.2–1.3× as wide as high in frontal view ( Fig. 13a ); eyes separated by 0.8–1.0× their height; malar space 0.2–0.3× height of eye; mouth 2.5–2.7× malar space; clypeus with apical margin produced, trun- cate or slightly incised medially. Antenna weakly clavate ( Fig. 6a ); scape 0.6–0.7× as long as height of eye, reaching anterior ocellus; combined length of pedicel and flagellum 1.3–1.4× width of head; pedicel 1.6–1.8× as long as wide; anellus quadrate; F1 1.5–1.7× as long as wide, as long as pedicel; F2 1.3–1.5× longer than wide; F3–F5 1.2–1.3× as long as wide; F6 1.0–1.2× as long as wide; F7 quadrate; each funicular segment bearing longitudinal sensilla arranged in irregular one or two rows; C3 with a small tuft of micropilosity beneath.

Mesosoma 1.8–2.0× as long as wide; mesoscutum ( Fig. 13b ) with small piliferous punctures; sculpture on mesoscutum in anterior half transversely reticulate; notaulus shallow; scutellum ( Fig. 13c ) 1.3–1.5× as long as wide, sculptured as posterior part of mesoscutum; dorsellum without median carina; propodeum ( Fig. 13d ) with superficial reticulation, smoother medially; lower mesepimeron 1.5–1.6× as long as wide. Fore wing 2.5–2.6× as long as wide ( Fig. 24f ); costal cell 8.8–11.0× as long as wide, on upper surface with a setal row which becomes double apically, on lower surface with a setal row and scattered setae; basal cell closed, hairy; cubital setal line present; basal setal line present; speculum very small, closed below; relative lengths of marginal vein: postmarginal vein: stigmal vein=10.3: 2.2: 1.0. Hind coxa elongate, 2.7–2.9× as long as wide, with dorsal carina extending 0.3 length; dorsal surface of hind coxa with setae in basal half; hind femur 5.3–5.7× as long as wide; hind tibia with longer spur 1.1–1.3× as long as width of hind tibia, 0.3–0.4× length of basitarsus; shorter spur 0.7–0.8× length of longer spur.

Metasoma as long as mesosoma plus head; posterior margin of metasomal tergum five incised; tip of hypopygium situated at 0.3 length of metasoma; ovipositor sheath 1.4–1.5× as long as body, 5.2–5.9× as long as hind tibia.

Male. Differs from female as follows. Body length 2.3 mm. Antenna stouter than that of female ( Fig. 6b ); scape darker, anellus transverse, 2.5× as wide as long; F1–F2 1.3× as long as wide; F3–F7 quadrate; longitudinal sensilla on each segment arranged in one row. Lower mesepimeron 1.3× as long as wide. Relative lengths of marginal vein: postmarginal vein: stigmal vein=8.5: 2.4: 1.0. Hind coxa 2.4× as long as wide; hind femur 4.6× as long as wide; hind tibia with longer spur 0.6× length of basitarsus. Metasoma with coppery tint.

Distribution. Japan (Hokkaido, Kyushu).

Host information. Torymus hirtipennis is an ectoparasitoid of Schizomyia sasakii (Monzen) ( Diptera : Ceci- domyiidae) that induces galls on Ilex crenata Thunb. (Aquifoliaceae) (gall photo: fig. 26h, C–373 of Yukawa & Masuda 1996).

Remarks. Females of T. hirtipennis are similar to T. hylesini Graham , a European species ( Graham & Gijswijt 1998), by having the following shared features: malar space 0.2–0.3× height of eye; mouth 2.5–2.7× malar space; anellus of antenna quadrate; F7 quadrate; mesoscutum with small piliferous punctures; sculpture on mesoscutum in anterior half transversely reticulate; notaulus shallow; scutellum 1.3–1.5× as long as wide, sculptured as posterior part of mesoscutum; dorsellum without median carina; propodeum with superficial reticulation, smoother medially; posterior margin of metasomal tergum five incised; ovipositor sheath 1.4–1.5× as long as body. However, females of T. hirtipennis can be distinguished from T. hylesini by having the following features: POL 2.0–2.1× OOL (1.7–1.8× OOL in T. hylesini ); each funicular segment of antenna bearing longitudinal sensilla arranged in irregular one or two rows (two rows in T. hylesini ); hind coxa 2.7–2.9× as long as wide (about 2× as long as wide in T. hylesini ); dorsal surface of hind coxa with setae in basal half (without setae in basal half in T. hylesini ); hind femur 5.3–5.7× as long as wide (about 4× as long as wide in T. hylesini ); basal cell of fore wing closed, hairy (widely opened below, with a setal row below submarginal vein in T. hylesini ); speculum very small, closed below (opened below in T. hylesini ).

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 13 a–d. T. hirtipennis ♀. a, head, frontal view; b, mesoscutum, dorsal view; c, scutellum, dorsal view; d, propodeum, 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.