Torymus rugosus Matsuo, 2020

Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), Zootaxa 4758 (3), pp. 401-441 : 428-430

Torymus rugosus Matsuo n. sp.

Figs 3d , 7 a–b, 19a–d, 25c

Etymology. The specific name, rugosus , is derived from the associated plant of this species.

Type material. Holotype: ♀ ( BLKU), emerged on 17 July 2007 from a gall of Dasineura sp. on Rosa rugosa collected by Y. Tazuhara and K. Matsuo on 1 July 2007 from Zenibako, Otaru, Hokkaido, Japan. Paratypes: 7 ♀,

same data as the holotype ( BLKU); 1 ♀, emerged on 10 July 2007 from a gall of Dasineura sp. on Rosa rugosa collected by Y. Tazuhara and K. Matsuo on 1 July 2007 from Hama, Ishikari, Hokkaido ( BLKU); 1 ♂, emerged on 11 July 2007 from a gall of Dasineura sp. on Rosa rugosa collected by Y. Tazuhara and K. Matsuo on 1 July 2007 from Hama, Ishikari, Hokkaido ( BLKU); 2 ♂, emerged on 13 July 2007 from a gall of Dasineura sp. on Rosa rugosa collected by Y. Tazuhara and K. Matsuo on 1 July 2007 from Zenibako, Otaru, Hokkaido ( BLKU); 2 ♀ and 1 ♂, emerged on 15 July 2007 from a gall of Dasineura sp. on Rosa rugosa collected by Y. Tazuhara and K. Matsuo on 1 July 2007 from Hama, Ishikari, Hokkaido ( BLKU); 1 ♂, emerged on 17 October 2008 from a gall of Dasineura sp. on Rosa rugosa collected by K. Matsuo on 8 October 2008 from Mt. Moiwa, Sapporo, Hokkaido ( BLKU); 1 ♀, emerged on 28 October 2008 from a gall of Diplolepis sp. on Rosa rugosa collected by Y. Abe and K. Matsuo on 8 October 2008 from Mt. Moiwa, Sapporo, Hokkaido ( BLKU).

Description. Female. Body length excluding ovipositor sheath 2.9–3.8 mm. Head bluish green. Scape brownish yellow with apical tip darker; pedicel black with a metallic tinge; flagellomeres black. Mesosoma bluish green. Fore wing hyaline. Fore coxa concolorous with mesosoma in basal half; mid and hind coxae concolorous with mesosoma; all femora and tibiae yellowish brown; claws brown. Metasoma bluish green with bluish tint ( Fig. 3d ).

Head 2.0–2.2× as wide as long in dorsal view; temple 0.2× as long as dorsal length of eye; POL 2.3–2.6× OOL; OOL 1.0–1.2× OD. Head 1.2–1.3× as wide as high in frontal view ( Fig. 19a ); eyes separated by their height; malar space 0.3× height of eye; mouth 2.0–2.3× malar space; clypeus with apical margin produced, rounded. Antenna not clearly clavate ( Fig. 7a ); scape 0.6–0.7× as long as height of eye, just reaching ventral margin of anterior ocellus; combined length of pedicel and flagellum 1.3–1.4× width of head; pedicel 1.5–1.7× as long as wide; anellus 1.0–1.2× as wide as long; F1 1.3–1.6× as long as wide, as long as pedicel; F2–F5 1.3–1.5× longer than wide; F6–F7 quadrate; each funicular segment bearing longitudinal sensilla arranged in two rows; C3 with a small tuft of micropilosity beneath.

Mesosoma 1.7–1.9× as long as wide; mesoscutum ( Fig. 19b ) with small piliferous punctures; sculpture on me- soscutum in anterior half transversely reticulate; notaulus shallow; scutellum ( Fig. 19c ) 1.2–1.4× as long as wide, sculptured as posterior part of mesoscutum; dorsellum without median carina; propodeum ( Fig. 19d ) with superficial striae, polished medially; lower mesepimeron 1.4–1.5× as long as wide. Fore wing 2.3–2.5× as long as wide ( Fig. 25c ); costal cell 8.6–9.5× as long as wide, on upper surface with a setal row in distal half, on lower surface with a complete setal row and scattered setae apically; basal cell closed, with a few setae below submarginal vein; cubital setal line present; basal setal line present; speculum narrowly opened below; relative lengths of marginal vein: postmarginal vein: stigmal vein=9.5: 2.5: 1.0. Hind coxa stout, 1.7–1.9× as long as wide, with dorsal carina basally; dorsal surface of hind coxa with short setae in basal half; hind femur 3.8–4.0× as long as wide; hind tibia with longer spur 1.2–1.5× as long as width of hind tibia, 0.4–0.5× 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 0.7 length of metasoma; ovipositor sheath as long as metasoma, 1.7–1.9× as long as hind tibia.

Male. Differs from female as follows. Body length 2.3–2.7 mm. POL 2.0–2.3× OOL. Antenna stouter than that of female ( Fig. 7b ); scape bluish green, not reaching anterior ocellus; pedicel 1.2–1.3× as long as wide; anellus transverse, twice as wide as long; F1 1.0–1.1× as long as wide; F2–F7 0.9–1.0× as long as wide; longitudinal sensilla on each funicular segment arranged in one row. Lower mesepimeron twice as long as wide. Relative lengths of marginal vein: postmarginal vein: stigmal vein=8.0: 2.2: 1.0. Hind femur and hind tibia darkened medially with metallic reflections. Metasoma with coppery tint; posterior margin of metasomal tergum five entire.

Distribution. Japan (Hokkaido).

Host information. Torymus rugosus is an ectoparasitoid of Dasineura sp. ( Diptera : Cecidomyiidae ) (gall photo: fig. 27e, C–327 of Yukawa & Masuda 1996) on Rosa rugosa Thunb. (Rosaceae) and Diplolepis sp. ( Hymenoptera : Cynipidae ) on R. rugosa (gall photo: fig. 27f, C–328 of Yukawa & Masuda 1996).

Remarks. Females of T. rugosus are similar to T. confinis (Walker) , a European species ( Graham & Gijswijt 1998), by having the following shared features: malar space 0.3× height of eye; mouth 2.0–2.3× malar space; scape reaching ventral margin of anterior ocellus; sculpture on mesoscutum in anterior half transversely reticulate; notaulus shallow; scutellum sculptured as posterior part of mesoscutum; dorsellum without median carina; propodeum with superficial striae, polished medially; costal cell on upper surface with a setal row in distal half, on lower surface with a complete setal row and scattered setae apically; basal cell closed, with a few setae below submarginal vein; speculum narrowly opened below; hind coxa with dorsal carina basally; dorsal surface of hind coxa with setae in basal half; hind tibia with longer spur 1.2–1.5× as long as width of hind tibia, 0.4–0.5× length of basitarsus. However, females of T. rugosus can be distinguished from T. confinis by having the following features: anellus 1.0–1.2× as wide as long (distinctly transverse in T. confinis ); F1–F5 longer than wide (quadrate in T. confinis ); each funicular segment bearing longitudinal sensilla arranged in two rows (one row in T. confinis ).

Figures

FIGURE 3 a–d. ♀, lateral view. a, T. minamii; b, T. quernus; c, T. ringofushi; d, T. rugosus.

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 19 a–d. T. rugosus ♀. 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.