Aprostocetus (Aprostocetus) tselikhae Kosheleva, 2025

Tselikh, Ekaterina V., Kosheleva, Oksana V., Ku, Deok-Seo, Lee, Jaehyeon & Belokobylskij, Sergey A., 2025, The hymenopteran parasitoid complex (Hymenoptera, Braconidae, Eulophidae, Pteromalidae) of the pine bark beetle Cryphalus fulvus Niisima, 1908 (Curculionidae, Scolytinae) in South Korea, Journal of Hymenoptera Research 98, pp. 637-652 : 637-652

Aprostocetus (Aprostocetus) tselikhae Kosheleva sp. nov.

Figs 6–16

Comparative diagnosis.

Aprostocetus tselikhae sp. nov. is similar to A. crypturgus Yang, 1996 because they have a F 1 1.62–1.64 × as long as pedicel; scutellum with distance between SMG equal distance SMG to SLG; ovipositor sheath projecting by 0.1–0.2 length of Mt 8. However, A. tselikhae sp. nov. have the anterior pair of setae clearly visible behind the middle of scutellum (vs. in the middle); clava 2.37 × as long as broad (vs. 2.7 ×); not visible articulations between claval segments (vs. visible); funicle with straight longitudinal sensillae (vs. twisted); gaster 1.96–2.25 × as long as broad (vs. 2.7 ×).

Description.

Female. Body length 1.63–1.88 mm; fore wing length 1.26–1.31 mm.

Coloration. Head with areas around ocellus and occiput yellowish brown. Antenna with scape and pedicel reddish yellow, flagellum dark brown. Posterior margin of pronotum, median part of scutellum, dorsellum, median part of propodeum and metasoma from brownish-black to fuscous. All legs yellow. Tegulae brown; wings hyaline, venation pale yellow.

Sculpture. Mesoscutum moderately shiny, with delicate superficial reticulation; propodeum shiny with smooth engraved reticulation; metasoma with Mt 2 - Mt 4 smooth, Mt 5 - Mt 6 alutaceous.

Head. Head in dorsal view 2.42 × as broad as long and 1.05–1.13 × as broad as mesosoma, in frontal view 1.15 × as broad as height. POL 1.67 × OOL; OOL 2 × OD. Face medially concave. Malar space 0.58–0.6 × as long as eye height; malar sulcus moderately curved. Mouth 1.42–1.45 × as wide as height of malar space. Antenna with scape 0.8 × as long as eye height; 3.56 × as long as broad and reaching of median ocellus; combined length of pedicel and flagellum 1.34–1.41 × breadth of head; 1.5–1.53 × breadth of mesoscutum; pedicel 1.75 × as long as broad and 0.57 × as long as F 1; funicle proximally not stouter than pedicel; F 1 3–3.25 ×, F 2 2.22–2.4 ×, F 3 1.67–2 × as long as broad. Clava slightly broader than F 3; 0.76–0.78 × as long as F 2 – F 3 and 2.37 × as long as broad; articulation of claval segments not visible.

Mesosoma. Mesosoma in dorsal view 1.53 × as long as broad. Pronotum medially 0.3–0.42 × as long as mesoscutum. Mid lobe of mesoscutum 1.07 × as broad as long; median line fine but traceable in some lights, with 4 adnotaular setae on each side. Scutellum 0.62 × as long as mid lobe of mesoscutum, 1.32 × as broad as long; distance between SMG equal distance SMG to SLG, enclosing space 2.29 × as long as broad; have the anterior pair of setae clearly visible behind the middle of scutellum; distance between anterior pairof setae and front edge of scutellum 2 × distance between anterior and posterior pair of setae. Dorsellum 0.37 × as long as scutellum and 2 × as broad as long. Propodeum medially as long as dorsellum; median carina distinct; callus with 4 setae. Legs slender; hind femur 3.13 × as long as broad; spur of mid tibia as long as basitarsus. Fore wing 1.96–2.1 × as long as broad; costal cell 0.71 × length of M, 12.5 × as long as broad; SM with 4 dorsal setae; M 3.5 × length of S, its front edge with 13 setae; ST thin proximally, expanding gradually forming rather indistinct stigma; PM rudimentary; speculum small, not extending below M; cilia 0.3 × length of S. Hind wing obtuse; cilia 0.26 × breadth of wing.

Metasoma. Metasoma 1.33–1.5 × as long as mesosoma; 1.09–1.18 × as long as head and mesosoma combined. Gaster longitudinal-oval, 1.96–2.25 × as long as broad, acuminate; its last tergite as long as broad; ovipositor sheath projecting by 0.1 length of Mt 8; cerci with one pair of setae 2 × as long as second pair, slightly curved; tip of hypopygium at 0.51–0.6 length of gaster.

Male. Body length 1.53 mm; fore wing length 1.26 mm. Mid lobe of mesoscutum 1.04 × as long as broad; with 3 adnotaular setae on each side. Antenna with scape 2.14 × as long as broad, with ventral plaque 0.53 length of scape; combined length pedicel and flagellum 2.19 × breadth of mesoscutum; pedicel 1.56 × as long as broad, and as long as F 1; F 1 quadrate, F 2 2.2 × as long as broad, F 3 and F 4 2.6 × as long as broad; clava 1.07 × as long as F 3 – F 4, 7 × as long as broad, with C 1 and C 2 subequal and 2.5 × as long as broad; C 3 slightly shorter; whorled setae long. Metasoma as long as mesosoma, 0.78 × as long as head and mesosoma combined; gaster 1.89 × as long as broad. Otherwise, similar to female.

Etymology.

The species is named in honour of the Russian hymenopterist, expert of Pteromalidae, and main collector of the types, Dr Ekaterina V. Tselikh (ZISP).

Type material.

Holotype: South Korea • ♀; Gyeongsangnam-do, Sancheong-gun, Chahwang-myeon, Silmae-ri , 35°29'39"N, 127°56'30"E, reared from Cryphalus fulvus Niisima, 1908 on Pinus densiflora Siebold & Zucc. , 22.VII.2024, coll. E. Tselikh, J. Lee; ( NIBR) . Paratypes: South Korea • 1 ♀, 1 ♂; same label as holotype, antenna of female – permanent slide no. 123; antenna and fore wing of male – permanent slide nos 124 and 126; ( ZISP) .

Distribution.

Republic of Korea.

Biology.

Ectoparasitoids of larvae of the bark beetle Cryphalus fulvus Niisima ( Curculionidae , Scolytinae ) developing on Pinus densiflora .

Figures

Figures 6–16. Aprostocetus (Aprostocetus) tselikhae Kosheleva, sp. nov., holotype female (6–14) 6, 7 body, dorso-lateral view 8 antenna, head and part of mesosoma, lateral view 9 head, frontal view 10 mesosoma, dorsal view 11 head, dorsal view 12 propodeum, dorsal view 13 fore wing 14 antenna. Paratype male (15, 16) 15 fore wing 16 antenna.