Scutibracon storozhenkoi Samartsev, Duong & Long, 2025

Samartsev, Konstantin G., Duong, Tran Dinh & Long, Khuat Dang, 2025, The genus Scutibracon Quicke & Walker (Hymenoptera: Braconidae) in Vietnam, with new records and descriptions of two new species, Zootaxa 5715 (1), pp. 407-418 : 412-414

Scutibracon storozhenkoi Samartsev, Duong & Long , sp. nov.

( Figs 25–36 )

Material. Holotype, Vietnam, Vinh Phuc Province, Phuc Yen City, Ngoc Thanh Commune, Me Linh Biodiversity Station , 21°23’03” N, 105°42’40” E, h = 60 m, Malaise trap No 1, 10.vii.2021 ( Tran Dinh Duong & Trinh Xuan Thanh), female (IB KS0004374 ) . Paratypes. Vietnam, Cao Bang Province, Nguyen Binh District, Tinh Tuc Town, Phia Oac —Phia Den National Park, Camy Ranger Station , 22°38’33”N, 105°50’47”E, h = 1191 m, sweeping, 3.vi.2023 (Tran Dinh Duong), 1 female ( ZISP INS _HYM_0002854) . Hoa Binh Province, Lac Son District, Quy Hoa Commune, Thuong Tien Nature Reserve , Thuong 1 Village , 20°37’29” N, 105°29’9” E, h = 689 m, sweeping, 20.vii.2024 (Tran Dinh Duong), 1 female ( ZISP INS _HYM_0002853) . Lang Son Province, Huu Lung District, Huu Lien Commune, Lang Ben Village , Huu Lien Nature Reserve , 21°41’33” N, 106°23’6” E, h = 227 m, sweeping, 08.viii.2024 (Tran Dinh Duong), 1 female (IB KS0004451 ) .

Diagnosis. This species differs from all other known species of the genus by the absence of the dorsal carinae on T1, mostly granulate rather than rugose sculpture of metasoma, and elongate second submarginal cell.

Description. Female. Body length 1.6–1.7 mm; fore wing length 1.8–1.9 mm.

Head. Width of head (dorsal view) 1.9 × its median length. Transverse diameter of eye (dorsal view) 2.0–2.3 × as long as temple. OOL 2.2–2.5 × OD; POL 1.0–1.2 × OD; OOL 2.0–2.2 × POL. Frons not impressed, with deep mid-longitudinal groove. Vertex longitudinally not impressed. Longitudinal diameter of eye in lateral view 1.2–1.3 × its transverse diameter, transverse diameter of eye 2.9–3.3 × minimum width of temple, hind margins of eye and temple slightly broadened ventrally. Face width 1.3–1.4 × combined height of face and clypeus; 2.4–3.0 × width of hypoclypeal depression. Width of hypoclypeal depression 0.9–1.1 × distance from depression to eye. Intertentorial distance 1.6–1.7 × tentorio-ocular distance. Clypeus flattened, with weakly protruding ventral rim, clypeal sulcus absent, dorsal clypeal margin sharp, height of clypeus 0.40–0.45 × width of hypoclypeal depression. Longitudinal diameter of eye 3.0–3.1 × as long as malar space (front view). Maxillary palp somewhat longer than eye.

Antenna 1.1–1.2 × as long as fore wing, with 22 antennomeres. First flagellomere 2.7–3.0 × as long as its apical width, middle and penultimate flagellomeres 2.0–2.8 × and 2.4–2.9 × as long as wide, respectively.

Mesosoma 1.4–1.5 × as long as its maximum height. Transverse pronotal sulcus deep, anteriorly crenulate. Median lobe of mesoscutum not protruding anteriorly (dorsal view). Width of mesoscutum 1.2 × its median length (dorsal view). Notauli weakly impressed anteriorly, absent posteriorly. Mesoscutum setose on notaulic area and posteriorly, anteromedially widely glabrous. Scutellar sulcus 0.15–0.20 × as long as scutellum. Mesepimeral sulcus smooth, mesopleural pit almost indistinct. Median area of metanotum with incomplete median carina. Metapleural sulcus smooth. Propodeal spiracle round, weakly protruding, located behind middle of propodeum. Mid-longitudinal keel developed on apical third of propodeum, with long transverse rugae; mid-longitudinal impression deep and crenulate.

Fore wing. Angle between veins C+SC+R and 1-SR 60–70°. Vein r arising from basal 0.3–0.4 of pterostigma. Vein 1-R1 1.7–1.8 × as long as pterostigma. Marginal cell 9.0–13.5 × as long as distance from its apex to apex of wing. Vein 3-SR 2.0–2.5 × vein r, 0.4–0.5 × vein SR1, 1.3–1.6 × vein 2-SR. Vein 1-M 0.7–0.8 × vein 1-SR+M, 1.8–1.9 × vein m-cu, 2.8–3.4 × vein cu-a. Vein cu-a interstitial. Vein 2-SR+M about 0.3 × vein 2-SR, 0.5–0.6 × vein m-cu.

Legs. Hind femur 3.3–3.7 × as long as wide. Hind tibia 7.5–9.5 × as long as wide, 1.6 × as long as hind femur, its inner spur 0.25–0.30 × as long as hind basitarsus. Hind tarsus 1.0–1.2 × as long as hind tibia, 0.9–1.0 × as long as mesosoma. Fifth segment of hind tarsus about 0.4 × as long as hind basitarsus and about 0.7 × as long as second segment. Claws with shortly protruding and blunt basal lobes.

Metasoma with 4 dorsally visible tergites. Median length of T1 0.7–0.8 × its apical width. Dorsal carinae of T1 absent. Posterior width of T1 1.1–1.2 × median length of T2. T2 medially 0.95–1.0 × as long as T3. Anterior width of T2 1.4–1.6 × its median length. Median area of T2 not elevated, parallel-sided, about half as wide as median area of T1 and not reaching hind margin of T2; mid-longitudinal keel absent. Dorsolateral impressions of T2 shallow, sublateral carinae and anterolateral areas absent. Spiracle of T2 located at middle of tergite. Suture between T2 and T3 weakly curved. Posterior margins of T3 and T4 with deep and crenulate transverse subapical grooves. Ovipositor sheath 0.3–0.5 × as long as hind tibia and 0.12–0.16 × as long as fore wing. Apex of ovipositor with shallow nodus and weak ventral serration.

Sculpture. Body mostly smooth. Propodeum transversely rugose posteriorly. T1 laterally rugulose, its median area smooth to weakly striate. T2 irregularly punctate to granulate, T3 weakly granulate, T4 shagreened.

Colour. Scape brownish yellow, laterally brown; flagellum brown with yellowish brown basal flagellomeres. Head reddish yellow, pale yellow below eyes; occiput and gena along margin of eye brownish darkened. Maxillary palps pale yellow. Mesosoma reddish brown with dark brown patches on mesoscutal lobes, ventral side of mesopleuron and propodeum. Tegulae yellow or brownish yellow. Wing membrane weakly darkened; pterostigma pale yellowish brown with brown patch apically, wing veins pale brown. Metasoma brownish yellow, with dark brown T1 (except its median area) and patches near median area of T2 and most of T3 and T4 (except light-coloured mid-lingitudinal stripe).

Male. Unknown.

Host. Unknown.

Etymology. The species is named in honor of Professor Sergey Yurievich Storozhenko, a prominent orthopterologist who significantly contributed to the knowledge of Vietnamese and East Asian entomofauna.

Distribution. Vietnam.

Figures

FIGURES 25–36. Scutibracon storozhenkoi sp. nov. (holotype, female, IB); 25—habitus, lateral view; 26—head, front view; 27—head, dorsal view; 28—mesosoma, dorsal view; 29—head, lateral view; 30—antennae, lateral view; 31—wings; 32— mesosoma, lateral view; 33—T1, dorsal view; 34—propodeum and metasoma, dorsal view; 35—hind tarsus; 36—inner claws of middle and hind legs. Scale bars: 1.0 mm 25, 30, 31); 0.25 mm (26–29, 32–36).