Torymus quernus Matsuo 2020, n. sp.
Creators: name: Matsuo, Kazunori
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Torymidae
Torymus
Torymus quernus

description: Torymus quernus Matsuo n. sp.
Figs 3b, 6g, 17 a–d, 25b
Etymology. The specific name, quernus, is derived from the host plant of host insect.
Type material. Holotype: ♀ (BLKU), emerged on 27 April 2010 from a gall of Dryocosmus kunugiphagus on Quercus acutissima collected by N. Wachi on 18 April 2010 from Kokonoe, Oita, Japan. Paratypes: 1 ♀, same data as the holotype (BLKU). 3 ♀, emerged on 6 April 2017 from a gall of Dryocosmus kunugiphagus on Quercus acutissima collected by K. Matsuo on 18 March 2017 from Kokonoe, Oita, Japan (BLKU).
Description. Female. Body length excluding ovipositor sheath 2.8–2.9 mm. Head bluish green. Scape yellowish brown but darker apically; pedicel and flagellum dark brown. Mesosoma bluish green. Fore wing hyaline. All coxae concolorous with mesosoma; all femora bluish green, basal and apical tips lighter; fore tibia and mid tibia yellowish brown; hind tibia dark green. Metasoma bluish green with bluish tint (Fig. 3b).
Head in dorsal view 2.0–2.2× as wide as long; temple 0.2–0.3× as long as dorsal length of eye, curved; POL 1.9× OOL; OOL 1.7× OD. Head in frontal view 1.3× as wide as high (Fig. 17a); eyes separated by 1.1× their height; mouth 2.5× malar space, the latter 0.3× height of eye; gena slightly curved; clypeus with apical margin not produced, straight. Antenna clavate (Fig. 6g); scape 0.6× 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 transverse, 2.0–2.5 as wide as long; F1 1.0–1.2× as long as wide, slightly longer than pedicel; F2 0.9× as long as wide; F3–F4 0.8× as long as wide; F5 0.7× as long as wide; F6–F7 0.6× as long as wide; each funicular segment bearing longitudinal sensilla arranged in irregular one or two rows; C3 with a small tuft of micropilosity beneath.
Mesosoma 1.6× as long as wide; mesoscutum (Fig. 17b) transversely reticulate; scutellum (Fig. 17c) 1.3× as long as wide; frenal line absent; frenal area indicated by a difference in sculpture from the rest of scutellum, smoother and glabrous toward apex; dorsellum with a median carina; propodeum (Fig. 17d) with complete submedian carina; lower mesepimeron 1.5–1.8× as long as wide, rectangular. Fore wing 2.3× as long as wide (Fig. 25b); costal cell 9.1–9.3× as long as wide, on upper surface with a setal row in distal half, on lower surface with a setal row, with scattered setae; basal cell closed, with a row of 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=7.9: 2.3: 1.0. Hind coxa 1.8–2.0× as long as wide, with sharp dorsal carina extending half length; dorsal surface of hind coxa bare in basal half; hind femur 3.6–3.9× as long as wide; hind tibia with longer spur 1.2–1.3× as long as width of hind tibia, 0.4–0.5× length of basitarsus; shorter spur 0.6× length of longer spur.
Metasoma slightly shorter than mesosoma; posterior margin of metasomal tergum five entire; tip of hypopygium situated at 0.5 length of metasoma, with a few setae; ovipositor sheath as long as metasoma plus 1/2 mesosoma, 2.5–2.8× as long as hind tibia.
Male. Unknown.
Distribution. Japan (Kyushu).
Host information. This species is a parasitoid of Dryocosmus kunugiphagus Ide and Abe (Hymenoptera: Cynipidae) that induces spindle–shaped gall on the buds of Quercus acutissima Carruth (Fagaceae) (gall photo: fig. 27d, C–079 of Yukawa & Masuda 1996).
Remarks. Females of T. quernus are similar to T. koreanus Kamijo by having the following share features: temple curved; antenna clavate; scape not reaching anterior ocellus; frenal area indicated by a difference in sculpture from the rest of scutellum; propodeum with complete submedian carina; ovipositor sheath 2.5–2.8× as long as hind tibia. However, females of T. quernus can be distinguished from T. koreanus by the following characters: pedicel 1.2× as long as wide (1.4–1.5× as long as wide in T. koreanus); longitudinal sensilla on each funicular segment arranged in irregular one or two rows (one row in T. koreanus); hind coxa with sharp dorsal carina extending half length (with a complete dorsal carina in T. koreanus); costal cell of fore wing on upper surface with a setal row in distal half (with a setal row which becomes double in distal half in T. koreanus); speculum narrowly opened below (closed below in koreanus).
description: Published as part of Matsuo, Kazunori, 2020, A revision of Japanese Torymus Dalman (Hymenoptera: Torymidae), pp. 401-441 in Zootaxa 4758 (3) on pages 426-427, DOI: 10.11646/zootaxa.4758.3.1, http://zenodo.org/record/3734584