Aphidius tonkinensis Tomanovic & van Achterberg 2026, sp. nov.

Aphidius tonkinensis Tomanović & van Achterberg sp. nov. urn:lsid:zoobank.org:act: 8A47513D-C530-43F7-A2DD-E0EEB030B74D Fig. 4 Diagnosis Based on the following combination of characters: 16–17 antennomeres, four maxillary and two labial palpomeres, prominent and well-developed notaulices, and a narrow pterostigma (4.35–4.70 times as long as wide) equal in length to the R1 metacarpal vein, this species can be distinguished from all its congeners. Etymology The name of the new species is derived from the Tonkin area, where specimens were collected. Type material Holotype VIETNAM • ♀; NW, Tonkin, Hoàng Liên N. R., 15 km W of Sa Pa; 1900 m a.s.l.; 15–21 Oct. 1999; C. van Achterberg leg.; Malaise trap; slide-mounted; RMNH. Paratypes VIETNAM • 2 ♀♀, 2 ♂♂; NW Tonkin, Hoàng Liên N. R., 15 km W of Sa Pa, 1900 m a.s.l.; 15–21 Oct. 1999; C. van Achterberg leg.; Malaise trap; paratype females slide-mounted, paratype males dry mounted; RMNH. Description Female MEASUREMENTS. Length of body 2.0 mm. COLOURATION (Fig. 4A). Pedicel, scape, and F1 yellow; F2 brown or light brown to one third; head brown, mouthparts yellow. Pronotum yellow to light brown; remaining parts of mesosoma brown. Legs yellow to light brown. First metasomal tergite light brown. Metasoma yellow to light brown. Ovipositor sheath light brown. HEAD (Fig. 4D) rounded. Face sparsely setose. Tentorial index 0.4. Malar space 0.2 times as long as longitudinal diameter of eye. Mandible bidentate, covered with dense, long setae. Antenna filiform, with 16–17 antennomeres (Fig. 4C) and setae subequal to half the flagellomere diameter. Flagellomere 1 (F1) as long as F2. Length/width ratio of F1 is 3.2–3.6, and F2 is 2.9–3.3. F1 without, F2 with two longitudinal placodes. Maxillary palps with four palpomeres, labial palps with two palpomeres (Fig. 4D). Clypeus with 13 long setae. MESOSOMA. Mesoscutum (Fig. 4H) with well-developed and clearly visible notaulices in the ascending part of its anterolateral area, outlined by two rows of long, scattered setae (9–10 per row) laterally, extending almost to scutellum. Scutellum with 2–3 setae laterally. Propodeum areolate, with 5–7 setae on upper areoles and 3 setae on lower areoles (Fig. 4B). Central areola not clearly closed dorsally and moderately wide. WINGS. Pterostigma 4.35–4.70 times as long as wide. Pterostigma subequal to R1 metacarpal vein, with its ratio between length of pterostigma and R1 metacarpal vein 1.0–1.2 (Fig. 4E). METASOMA. First metasomal tergite 2.9–3.3 times as long as wide at spiracle level, with about 10 curved costulae at the anterolateral area. First metasomal tergite rugose dorsally, with a prominent central carinae gradually diverging towards the base, and short sub-parallel lateral carinae along the entire dorsal view. (Fig. 4F). Ovipositor sheath moderately elongate and concave dorsally, as in Fig. 4G. Male Antennae 18-segmented. Scape and pedicel yellow; F1 with a narrow yellow ring at the base; remaining segments of the antennae light brown to brown. Head brown, mouthparts light brown, eyes black. Mesosoma light brown to brown. Legs yellow with dark apices. Metasoma light brown. Host Unknown. Distribution Vietnam.