Allocricellius minutus Tselikh, Ku & Lee, 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

Allocricellius minutus Tselikh, Ku & Lee sp. nov.

Figs 25–31

Comparative diagnosis.

Allocricellius minutus sp. nov. is similar to A. armandii Yang, 1996 (Figs 21–24 ) because they have a face with small tubercle on the inner orbit (Figs 22 , 26 ); the head in dorsal view is 2–2.12 × as broad as long (as in Fig. 28 ); propodeum with a transverse carina (Figs 24 , 30 ) and reticulate clypeus (Figs 22 , 26 ). However, A. minutus has POL 2–2.2 × as long as OOL (vs. POL 2.41–2.6 × as long as OOL); fore wing with M 1.8–1.9 × as long as S (Fig. 29 ) (vs. M 2.2–2.45 × as long as S: Fig. 23 ); hind femur dark brown with metallic blue green lustre (Fig. 25 ) (vs. hind femora yellow-brown: Fig. 21 ).

Description.

Female. Body length 1.17–1.9 mm; fore wing length 1.3–1.5 mm.

Colour. Head and mesosoma blue green with metallic diffuse coppery lustr; antenna with scape yellowi-brown; pedicel, anelli, F 1 – F 6 and clava brown. Fore and hind coxae dark blue with metallic violet lustre, mid coxa brown; all femora dark brown, all tibiae brown, all tarsi yellow-brown. Fore wing hyaline, venation brown. Metasoma dorsally dark brown with metallic green and coppery lustre; ovipositor sheath brown.

Sculpture. Head, clypeus and mesosoma reticulate; propodeum alutaceous; petiole smooth; metasoma smooth and shiny.

Head. Head in dorsal view 2–2.06 × as broad as long and 1.26–1.3 × as broad as mesoscutum; in frontal view 1.2–1.3 × as broad as high. POL 2–2.2 × as long as OOL. Eye height 1.08–1.11 × eye length and 1.49–1.57 × as long as malar space. Distance between antennal toruli and lower margin of clypeus 1.18–1.25 × distance between antennal toruli and median ocellus. Antenna with scape 0.92–0.93 × as long as eye height and 1–1.03 × as long as eye length; pedicel 1.9–2.0 × as long as broad; combined length of pedicel and flagellum 1.09–1.1 × breadth of head; F 1 – F 6 longer than broad, F 1 1.4–1.6 × as long as broad and with 1 row of sensilla; clava 2.16–2.2 × as long as broad, with small micropilose area on each C 3 and C 4. Lower margin of clypeus bidentate.

Mesosoma. Mesosoma 1.46–1.52 × as long as broad. Scutellum moderately arched, as long as broad, frenal area not distinct by sculpture. Propodeum 0.38–0.42 × as long as scutellum, without costula, median carina and nucha, with irregular transverse carina. Fore wing 2.3–2.5 × as long as its maximum width; basal cell with 0–3 setae; basal vein pilose; speculum open below; M 0.85–0.93 × as long as PM and 1.82–1.92 × as long as S; stigma small.

Metasoma. Metasoma 3.1–3.15 × as long as broad, 1.68–1.73 × as long as mesosoma, 1.18–1.22 × as long as mesosoma and head combined. Petiole transverse. Ovipositor sheath projecting slightly beyond apex of metasoma.

Male. Body length 1.6–1.7 mm; fore wing length 1.2–1.4 mm. Distance between antennal toruli and lower margin of clypeus 1.3–1.55 × distance between antennal toruli and median ocellus. Combined length of pedicel and flagellum 1.26–1.29 × breadth of head; clava 2.9–3.2 × as long as broad. Metasoma 2.22–2.33 × as long as broad, 1.11–1.19 × as long as mesosoma, 0.8–0.84 × as long as mesosoma and head. Otherwise similar to female.

Etymology.

From the Latin « minutus » (= small), referring to the small size of body of this species.

Material examined.

Holotype: South Korea • ♀; Gyeongsangnam-do, Geochang-gun, Namsang-myeon, Jeoncheok-ri , 35°37'15.3"N, 127°57'51.4"E, reared from Cryphalus fulvus Niisima on Pinus densiflora Siebold & Zucc. , 22.VI.2024, coll. E. Tselikh, J. Lee; ( NIBR) . Paratypes: South Korea • 5 ♀♀, 6 ♂♂; Gyeongsangnam-do, Geochang-gun, Namsang-myeon, Jeoncheok-ri , 35°37'15.3"N, 127°57'51.4"E, reared from Cryphalus fulvus Niisima on Pinus densiflora Siebold & Zucc. , 11–13.VI.2022 and 22.VI.2023, coll. E. Tselikh, J. Lee, S. Belokobylskij; ( ZISP) • 2 ♀♀, Geochang-gun, Mari-myeon, Yeongseung-ri , 35°42'51"N, 127°52'34"E, 06.VII.2023, coll. E. V. Tselikh; ( ZISP) • 5 ♀♀, 5 ♂♂; Sancheong-gun, Chahwang-myeon, Silmae-ri , 35°29'39"N, 127°56'30"E, reared from Cryphalus fulvus Niisima on Pinus densiflora Siebold & Zucc. , 22.VII.2024, coll. E. Tselikh, J. Lee; ( SMNE, ZISP) • 2 ♀♀, Daegu, Dalseong-gun, Yang-ri , 35°42'48"N, 128°30'41"E, 9.VIII.2024, coll E. Tselikh; ( SMNE) .

Distribution.

South Korea.

Biology.

Primary ectoparasitoids of the larvae of Cryphalus fulvus Niisima ( Curculionidae , Scolytinae ) developing on Pinus densiflora .

Remarks.

The genus Allocricellius Yang, 1996 is here recorded for the first time for the Korean Peninsula.

Figures

Figures 25–31. Allocricellius minutus Tselikh, Ku & Lee, sp. nov., holotype female 25 body, lateral view 26 head, frontal view 27 antenna 28 head and pronotum, dorsal view 29 wings 30 propodeum, dorsal view 31 body, dorsal view.

Figures 17–24. Sycosoter hattorii (Kono & Watanabe, 1935), not type female (17); Rhaphitelus maculatus Walker, 1834 (18); Pediobius moldavicus Bouček, 1965 (19); Roptrocerus xylophagorum (Ratzeburg, 1844) (20); Allocricellius armandii Yang, 1996 (21–24). 17–21 Body, lateral view 22 head, frontal view 23 fore wing 24 and scutellum and propodeum, dorsal view.