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

description: Torymus achyranthii Matsuo n. sp.
Figs 1a, 5 a–b, 8a–d, 24a
Etymology. The specific name, achyranthii, is derived from the name of the host insect.
Type material. Holotype: ♀ (BLKU), emerged on 25 November 2008 from a gall of Lasioptera achyranthii on Achyranthes bidentata var. japonica collected by J. Yukawa on 1 October 2008 from Mt. Tenpai, Yamaguchi, Chikushino, Fukuoka, Japan. Paratypes: 1 ♀, same data as the holotype (BLKU); 1 ♀, emerged on 17 September 2008 from a gall of Lasioptera achyranthii on Achyranthes bidentata var. japonica collected by K. Matsuo on 16 September 2008 from Kanno, Mannou, Kagawa, Japan (BLKU); 1 ♂, emerged under room temperature on 8 December 2008 from a gall of Lasioptera achyranthii on Achyranthes bidentata var. japonica collected by K. Matsuo on 13 October 2008 from Higashiaburayama, Fukuoka, Fukuoka, Japan (BLKU); 1 ♂, emerged under room temperature on 3 December 2008 from a gall of Lasioptera achyranthii on Achyranthes bidentata var. japonica collected by J. Yukawa on 1 October 2008 from Mt. Tenpai, Yamaguchi, Chikushino, Fukuoka, Japan (BLKU).
Description. Female. Body length excluding ovipositor sheath 2.5–2.7 mm. Head green. Scape yellowish brown but darker apically; pedicel and flagellum dark brown. Mesosoma green. Fore wing hyaline. Legs yellow. Lateral part of metasoma with yellowish brown area extending from base to two-thirds length of metasoma (Fig. 1a).
Head 2.0–2.1× as wide as long in dorsal view; temple narrow, 0.1× as long as dorsal length of eye; POL 1.8– 2.0× OOL; OOL 1.1× OD. Head 1.1–1.3× as wide as high in frontal view (Fig. 8a); eyes separated by their height; malar space 0.2–0.3× height of eye; mouth 2.7× malar space; clypeus with apical margin produced, truncate medially. Antenna not clearly clavate (Fig. 5a); scape 0.6× as long as height of eye, not reaching anterior ocellus; combined length of pedicel and flagellum as long as width of head; pedicel 1.7–2.0× as long as wide; anellus transverse, 1.2–1.5× as wide as long; F1–F5 quadrate; F6–F7 slightly transverse; each funicular segment bearing longitudinal sensilla arranged in one row.
Mesosoma 1.8–2.0× as long as wide; mesoscutum reticulate (Fig. 8b); notaulus shallow; scutellum (Fig. 8c) 1.2–1.3× as long as wide, sculptured as posterior part of mesoscutum; dorsellum with median carina though sometimes irregular; propodeum (Fig. 8d) with superficial reticulation; lower mesepimeron 1.3–1.6× as long as wide. Fore wing (Fig. 24a) 2.4–2.6× as long as wide; costal cell 8.2× as long as wide, on upper surface with a complete setal row, on lower surface with a setal row and scattered setae; basal cell closed below, and with a setal row below submarginal vein; cubital setal line present; basal setal line present; speculum narrowly open below; relative lengths of marginal vein: postmarginal vein: stigmal vein=9.5: 4.0: 1.0. Hind coxa 2.3× as long as wide, with dorsal carina basally; dorsal surface of hind coxa bare in basal half; hind femur 4.2–4.3× as long as wide; hind tibia with longer spur 1.3× as long as width of hind tibia, 0.3× 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 0.8 length of metasoma, with a few setae; ovipositor sheath as long as body, 3.3–3.5× as long as hind tibia.
Male. Differs from female as follows. Body length 2.6 mm. Anellus transverse, 2.0× as wide as long; F1 quadrate; F2–F5 0.8–0.9× as long as wide; F6–F7 0.7× as long as wide (Fig. 5b).
Distribution. Japan (Shikoku, Kyushu).
Host information. Torymus achyranthii is an ectopatasitoid of Lasioptera achyranthii Shinji (Diptera: Cecidomyiidae) that induces galls on Achyranthes bidentata Blume var. japonica Miq. (Amaranthaceae) (gall photo: fig. 26a, C–245 of Yukawa & Masuda 1996).
Remarks. Females of T. achyranthii are similar to T. cingulatus Nees, a Holarctic species (Noyes 2019), because of the following shared features: OOL 1.1× OD; malar space 0.2–0.3× height of eye; scutellum wholly sculptured; propodeum with superficial reticulation; hind coxa with dorsal carina basally; dorsal surface of hind coxa bare in basal half. However, females of T. achyranthii can be distinguished from T. cingulatus by the following features: POL 1.8–2.0× OOL (POL 1.5–1.7× OOL in T. cingulatus); scape not reaching anterior ocellus (reaching vertex in T. cingulatus); combined length of pedicel and flagellum as wide as width of head (about 1.2× as wide as width of head in T. cingulatus); each funicular segment bearing longitudinal sensilla arranged in one row (two rows in T. cingulatus); upper surface of costal cell with a complete setal row (becomes double row apically in T. cingulatus); hind femur 4.2–4.3× as long as wide (4.9–5.1× as long as wide in T. cingulatus).
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 404-406, DOI: 10.11646/zootaxa.4758.3.1, http://zenodo.org/record/3734584