Torymus minamii Matsuo, 2020

Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), Zootaxa 4758 (3), pp. 401-441 : 424-425

Torymus minamii Matsuo n. sp.

Figs 3a , 6 e–f, 16a–b, 25a

Etymology. The specific name honors Mr. Tsuneo Minami who first reared this species.

Type material. Holotype: ♀ ( BLKU), emerged on 8 August 2011 from a gall of Kiefferia pericarpiicola on Angelica sachalinensis var. sachalinensis collected by T. Minami from Asahikawa, Hokkaido, Japan. Paratypes: 2 ♀, same data as the holotype ( BLKU); 2 ♀, emerged on 22 July 2011 from galls of Kiefferia pericarpiicola on Angelica edulis collected by T. Minami from Shinhidaka, Hokkaido ( BLKU); 1 ♂, emerged on 9 September 2012 from a gall of Kiefferia pericarpiicola on Spuriopimpinella calycina collected by T. Minami from Kuriyama, Hokkaido ( BLKU).

Description. Female. Body length excluding ovipositor sheath 2.4 mm. Head bluish green. Scape brownish yellow; pedicel and flagellum dark brown. Mesosoma bluish green. Fore wing hyaline.All coxa and femora concolorous with mesosoma; fore and mid tibiae yellowish brown; hind tibia infuscate. Metasoma bluish green ( Fig. 3a ).

Head 2.1× as wide as long in dorsal view; temple 0.3× as long as dorsal length of eye; POL 2.5× OOL; OOL 1.1× OD. Head 1.2× as wide as high in frontal view; eyes separated by 0.9× their height; malar space 0.3× height of eye; mouth 2.0× malar space; clypeus with apical margin produced, truncate medially. Antenna not clearly clavate ( Fig. 6e ); scape 0.6× as long as height of eye, not reaching anterior ocellus; combined length of pedicel and flagellum 1.2× width of head; pedicel 1.9× as long as wide; anellus 1.5× as wide as long; F1–F5 0.8–1.0× as long as wide; F6–F7 0.7–1.0× as long as wide; each funicular segment bearing longitudinal sensilla arranged in one row.

Mesosoma 1.5× as long as wide; mesoscutum ( Fig. 16a ) transversely reticulate; notaulus shallow; scutellum ( Fig. 16b ) 1.3× as long as wide, sculptured as posterior part of mesoscutum; dorsellum without median carina; propodeum ( Fig. 16b ) with superficial reticulation, smoother medially; lower mesepimeron 1.4× as long as wide. Fore wing ( Fig. 25a ) 2.2× as long as wide; costal cell 8.0× 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; cubital setal line present; basal setal line present; speculum opened below; relative lengths of marginal vein: postmarginal vein: stigmal vein=9.6: 2.4: 1.0. Hind coxa 2.0× as long as wide, with dorsal carina basally; dorsal surface of hind coxa setose; hind femur 3.9× as long as wide; hind tibia with longer spur 1.3× as long as width of hind tibia, 0.5× length of basitarsus; shorter spur 0.7× 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 metasoma, 1.5× as long as hind tibia.

Male. Differs from female as follows. Body length 1.7 mm. Antenna stouter than that of female ( Fig. 6f ); pedicel 1.4× as long as wide; F1–F7 0.5–0.7× as long as wide.

Distribution. Japan (Hokkaido).

Host information. Torymus minamii is a parasitoid of Kiefferia pericarpiicola (Bremi) ( Diptera : Cecidomyiidae ) on Angelica sachalinensis Maxim. var. sachalinensis (Apiaceae) , A. edulis Miyabe ex Y. Yabe (gall photo: fig. 27c), and Spuriopimpinella calycina (Maxim.) Kitag. (Apiaceae) .

Remarks. Females of T. minamii are similar to T. sasae Matsuo because of the following shared features: scutellum sculptured as posterior part of mesoscutum; dorsellum without median carina; propodeum with superficial reticulation, smoother medially; speculum narrowly opened below; dorsal surface of hind coxa setose in basal half. However, females of T. minamii can be distinguished from T. sasae by having the following features: scape not reaching anterior ocellus (just reaching ventral margin of anterior ocellus in T. sasae ); each funicular segment bearing longitudinal sensilla arranged in one row (two rows in T. sasae ); posterior margin of metasomal tergum five entire (incised in T. sasae ); tip of hypopygium situated at 0.8 length of metasoma (0.6 length of metasoma in T. sasae ); ovipositor sheath as long as metasoma, 1.5× as long as hind tibia (2.3× as long as hind tibia in T. sasae ).

Figures

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

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 16 a–b. T. minamii ♀. a, mesoscutum, dorsal view; b, scutellum, 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.