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

description: Torymus aciculatus Matsuo n. sp.
Figs 1b, 5 c–d, 9a–d, 24b
Etymology. The specific name, aciculatus, is derived from the name of associated plant of this species.
Type material. Holotype: ♀ (BLKU), emerged on 6 May 2009 from a fruit gall of Neolitsea aciculata collected by K. Matsui on 19 April 2009 from Zoushi, Nara, Nara, Japan. Paratypes: 6 ♀ and 1 ♂, same data as the
holotype (BLKU); 4 ♀ and 2 ♂, emerged on 5 May 2009 from fruit galls of Neolitsea aciculata collected by K. Matsui on 19 April 2009 from Zoushi, Nara, Nara, Japan (BLKU); 7 ♂, emerged on 2 May 2009 from fruit galls of Neolitsea aciculata collected by K. Matsui on 19 April 2009 from Zoushi, Nara, Nara, Japan (BLKU).
Description. Female. Body length excluding ovipositor sheath 2.5–2.8 mm. Head bluish green with bluish tint. Scape yellowish brown but darker apically; pedicel and flagellum dark brown. Mesosoma bluish green with bluish tint. Fore wing hyaline. All coxae and femora concolorous with mesosoma; all tibiae yellowish brown. Metasoma bluish green with bluish tint (Fig. 1b).
Head 2.0× as wide as long in dorsal view; temple 0.2× as long as dorsal length of eye; POL 2.4–2.5× OOL; OOL 1.0–1.3× OD. Head 1.2× as wide as high in frontal view (Fig. 9a); eyes separated by 0.9–1.0× their height; malar space 0.3× height of eye; mouth 2.1× malar space; clypeus with apical margin produced, truncate medially.Antenna not clearly clavate (Fig. 5c); scape 0.5–0.6× as long as height of eye, not reaching anterior ocellus; combined length of pedicel and flagellum 1.1–1.2× width of head; pedicel 1.4–1.5× as long as wide; anellus 1.1–1.2× as wide as long; F1 quadrate, as long as pedicel; F2–F3 0.9–1.0× as long as wide; F4–F5 0.8–0.9× as long as wide; F6 0.7–0.8× as long as wide; F7 0.6–0.7× as long as wide; each funicular segment bearing longitudinal sensilla arranged in two rows; C3 with a small tuft of micropilosity beneath.
Mesosoma 1.7–1.8× as long as wide; mesoscutum (Fig. 9b) with small piliferous punctures; sculpture on mesoscutum transversely reticulate; notaulus shallow; scutellum (Fig. 9c) 1.4–1.5× as long as wide; frenal line absent; frenal area indicated by a difference in sculpture from rest of scutellum, smoother and glabrous toward apex; dorsellum with a median carina; propodeum (Fig. 9d) with longitudinal striae, smoother medially; lower mesepimeron 1.4× as long as wide. Fore wing 2.2–2.3× as long as wide (Fig. 24b); costal cell 7.2–9.0× as long as wide, on upper surface with a setal row in distal half, on lower surface with a setal row that is sparse medially and with scattered setae; basal cell bare; cubital setal line absent; basal setal line with a few setae; speculum widely open below; relative lengths of marginal vein: postmarginal vein: stigmal vein=8.5: 2.0: 1.0. Hind coxa stout, 1.8× as long as wide, with dorsal carina basally; dorsal surface of hind coxa bare in basal half; hind femur 3.8–4.3× as long as wide; hind tibia with longer spur 1.1–1.2× 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 slightly shorter than mesosoma; posterior margin of metasomal tergum five incised; tip of hypopygium situated at 0.5 length of metasoma; ovipositor sheath as long as metasoma plus 1/3 mesosoma, 2.3–2.4× as long as hind tibia.
Male. Differs from female as follows. Body length 2.5 mm. Antenna stouter than that of female (Fig. 5d); scape bluish green; anellus transverse, 2.5× as wide as long; longitudinal sensilla on each funicular segment arranged in one row. Lower mesepimeron 1.1× as high as wide; relative lengths of marginal vein: postmarginal vein: stigmal vein=10.0: 2.2: 1.0. Hind tibia dark green. Metasoma with coppery tint.
Distribution. Japan (Honshu).
Host information. Torymus aciculatus is a parasitoid of an unidentified gall midge (Diptera: Cecidomyiidae) that induces fruit galls on Neolitsea aciculata (Blume) Koidzumi (Lauraceae).
Remarks. Females of T. aciculatus are similar to T. koreanus Kamijo by having the following shared features: scape not reaching anterior ocellus; frenal area indicated by a difference in sculpture from rest of scutellum, with a few setae anterolaterally; dorsal surface of hind coxa bare in basal half; ovipositor sheath 2.3–2.4× as long as hind tibia. However, females of T. aciculatus can be distinguished from T. koreanus by the following features: antenna not clearly clavate (clavate in T. koreanus); each funicular segment bearing longitudinal sensilla arranged in two rows (one row in T. koreanus); frenal line absent (present medially in T. koreanus); propodeum with longitudinal striae, smoother medially (with submedian carinae in T. koreanus); hind coxa with dorsal carina extending for half length (with complete dorsal carina in T. koreanus); costal cell on upper surface with a setal row in distal half (becomes double row in distal half in T. koreanus); basal cell broadly open below (closed below in T. koreanus); speculum open below (closed below in T. 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 406-408, DOI: 10.11646/zootaxa.4758.3.1, http://zenodo.org/record/3734584