Rhaconotus (Rhaconotus) koreanus Belokobylskij et Ku, 2021

Belokobylskij, Sergey A., Ku, Deok-Seo & Broad, Gavin R., 2021, The tribe Rhaconotini (Hymenoptera: Braconidae: Doryctinae) of South Korea with description of a new Rhaconotus Ruthe species, Zootaxa 5040 (3), pp. 404-413 : 405-409

Rhaconotus (Rhaconotus) koreanus Belokobylskij et Ku , sp. nov.

zoobank.org:act: 6571D90F-DDF8-4DD1-AFC5-21933D7AC778

( Figs 1 , 2 )

Type material. Holotype: female, South Korea, Gyeongsangnam-do Masan-si, Hoewon-gu, Hapseong 2-dong, Mt. Palryongsan , 5.VI.2000 (at Mercury light lamp), An Tae-Ho leg. ( NIBR).

Paratypes. South Korea: 1 female, Gyeongsangbuk-do, Pohang-si, Buk-gu, Jukjang-myeon , Chimgok-ri , Naechimgok , Mt. Chimgoksan. 17.VIII.1997. Sweeping, Gang Tae-Gyun leg. ( NIBR) 1 female, Gyeongsangbukdo, Gyeongsan-si, Daehak-ro , Yeungnam Univ., 18.VIII.1987, Lee Jong-Wook leg. ( SMNE) ; 1 female, Gyeonggido, Osan-si, Sucheong-dong , Forestry Environment Institute , 12.VII. 1999. Malaise Trap, Lee Hyeong-Geon leg. ( ZISP) .

Description. Female. Body length 4.1–5.4 mm; fore wing length 3.3–3.8 mm.

Head ( Figs 1B, C, D ) width 1.5–1.7 × its median length, 1.2–1.3 × width of mesoscutum. Head behind eyes (dorsal view) distinctly and roundly narrowed. Transverse diameter of eye 1.5–1.6 × length of temple (dorsal view). Ocelli rather small, in triangle with base 1.1–1.2 × its sides; POL 1.25–1.40 × Od, 0.4–0.5 × OOL. Eye glabrous, weakly emarginated opposite antennal sockets, 1.20–1.25 × as high as broad. Malar suture absent. Malar space 0.45–0.50 × height of eye, almost equal to basal width of mandible. Face with rather wide median vertical and weakly convex area. Face width 0.9–1.1 × height of eye and 1.3–1.4 × height of face and clypeus combined. Clypeus with short and weak ventral flange. Upper margin of clypeus situated almost at lower level of eyes. Hypoclypeal depression sub-round, its width 0.7–0.8 × distance from edge of depression to eye, 0.4 × width of face. Occipital carina not fused ventrally with hypostomal carina, being obliterated rather far from upper base of mandible. Vertex distinctly convex. Head below eyes distinctly and weakly-roundly narrowed. Maxillary palpi 1.2–1.4 × longer than height of head.

Antennae ( Figs 1E, F ) rather slender, weakly setiform, with 37–39 antennomeres, about 1.3 × longer than body. Length of scapus 1.5–1.7 × its maximum width. First flagellomere 4.0–4.8 × longer than its apical width, 1.0–1.1 × as long as second flagellomere. Penultimate flagellomere 2.7–2.8 × longer than wide, 0.5–0.6 × as long as first flagellomere, 0.8–0.9 × as long as apical flagellomere; latter acuminate apically and without spine.

Mesosoma ( Figs 1G, H ) length 2.0–2.2 × its height. Pronotum anteriorly very weakly convex or almost straight and with distinct anterior upcurved rim (dorsal view), weakly convex dorsally (lateral view). Pronotal carina distinct, distances from carina to both sides of pronotum subequal. Mesoscutum distinctly elevated above pronotum (lateral view) but not high, gradually sloping. Notauli rather deep and relatively narrow anteriorly, shallow and wide posteriorly, complete, densely crenulate with reticulation. Median lobe of mesoscutum without median furrow. Prescutellar depression deep, weakly curved posterolaterally, with three–five carinae, mainly smooth between carinae, 0.25–0.30 × as long as convex scutellum. Scutellum with complete and fine lateral carinae. Sternaulus distinct but shallow in posterior third, narrow, weakly sinuate, crenulate with additional reticulation, running along almost entire lower part of mesopleuron. Prepectal carina distinct, with small widened lobes opposite fore coxae. Subalar depression relatively shallow, rather narrow, coarsely crenulate and sometimes with additional fine rugosity. Metanotum with short tooth, thick basally and acuminate apically. Metapleural lobe relatively long, rather wide, rounded apically, without dense white pubescence.

Wings ( Fig. 2A ). Length of fore wing 3.7–3.9 × its maximum width. Radial (marginal) cell not shortened. Metacarpus (1-R1) 1.1–1.2 × longer than pterostigma. Radial vein (r) arising almost from middle of pterostigma. First radial abscissa (r) forming weakly obtuse angle with second abscissa (3-SR). Second radial abscissa (3-SR) curved, 5.0–6.5 × longer than first abscissa (r), 0.7–0.8 × as long as weakly curved third abscissa (SR1), 1.5–2.0 × longer than first radiomedial vein (2-SR). Second radiomedial (submarginal) cell long, not widened distally, 3.0–3.4 × longer than wide, 1.25–1.40 × longer than narrow brachial (subdiscal) cell. First medial abscissa (1-SR+M) distinctly sinuate. Recurrent vein (m-cu) postfurcal. Mediocubital vein (M+CU1) distinctly curved to anal vein in distal half. Distance from nervulus (cu-a) to basal vein (1-M) 0.3–0.7 × nervulus (cu-a) length. Brachial (subdiscal) cell rather sharply and roundly closed just on recurrent vein (m-cu); posterior bulla fine or distinct; posterior abscissa of longitudinal anal vein (2-1A) (behind brachial vein (CU1b)) indistinct or practically absent. Hind wing 4.7–5.0 × longer than wide. First costal abscissa (C+SC+R) about 0.5 × as long as second abscissa (1-SC+R). First abscissa of mediocubital vein (M+CU) 0.45–0.55 × as long as second abscissa (1-M). Recurrent vein (m-cu) present, unsclerotised, weakly curved, oblique toward base of wing, distinctly antefurcal.

Legs ( Figs 1I, J ). Hind coxa with distinct basoventral tooth, 1.3–1.5 × longer than wide (with tooth). Hind femur with low and wide antero-dorsal protuberance, its length 3.3–3.5 × maximum width. Hind tarsus 1.1 × longer than hind tibia. Hind basitarsus about 0.7 × combined length of second–fifth segments. Second tarsal segment about 0.5 × as long as basitarsus, 2.3–2.5 × longer than fourth segment, 1.4–1.5 × longer than fifth segment (without pretarsus).

Metasoma ( Figs 2B, C ) 1.1–1.2 × longer than head and mesosoma combined, with 5 dorsally visible tergites. First tergite subbasally with short lateral subpointed tubercles. Maximum width of first tergite about twice its minimum basal width; its length 1.3–1.5 × apical width, 1.3–1.5 × length of propodeum. Second tergite without anterior (basal) area, with relatively shallow and wide, weakly sinuate or almost straight transverse furrow in posterior third, posterior (apical) transverse area weakly delineated. Median length of second tergite about 0.7 × its basal width, 1.5–1.8 × length of third tergite. Suture between second and third tergites rather shallow, wide, evenly curved. Fifth tergite moderately enlarged, weakly regularly rounded or almost straight on posterior margin, without median emargination and ventro-posterior lobes. Fifth tergite (measurement started from anterior transverse furrow) 1.4–1.6 × longer than fourth tergite. Ovipositor sheath 1.3–1.4 × longer than metasoma, 1.8–1.9 × longer than mesosoma, 0.8–0.9 × as long as fore wing.

Sculpture and pubescence. Vertex and frons entirely densely granulate, without rugosity; face densely and finely granulate, with fine or very fine semicircular rugulosity, almost smooth on small rounded upper medial area; temple densely granulate in upper half, densely coriaceous in lower half. Mesoscutum entirely very densely and rather finely granulate, without rugosity along notauli, with rather distinct and posteriorly convergent carinae in medioposterior third and here with fine and densely additional rugosity. Scutellum densely and finely granulate with fine and very dense semi-circular aciculation posteriorly. Mesopleuron entirely densely and distinctly reticulate-coriaceous. Metapleuron densely granulate-reticulate in anterior third or quarter, rugose-areolate in remaining posterior part. Propodeum without delineated baso-lateral areas, with long or short median and two weakly curved lateral longitudinal carinae, mainly densely granulate-rugulose, rugose-reticulate posteriorly. Hind coxa entirely densely granulate-reticulate, without additional striae dorsally. Hind femur densely reticulate-coriaceous, practically without aciculation. First tergite almost without or only with fine subparallel dorsal carinae. First and second tergites entirely, third and fourth on anterior two-thirds or four-fifths (but almost entirely laterally) distinctly striate with reticulation between striae; third and fourth tergites submedially with only dense and smoothed striation, completely smooth on posterior quarter of fifth. Fifth tergite densely reticulate-coriaceous on anterior third, densely and rather finely semi-circularly striate and practically without rugulosity on posterior two-thirds or half. Second–fourth tergites laterally entirely densely reticulate-rugulose and sometimes with fine additional striation. Vertex medially bare over rather wide area, posteriorly and laterally with relatively long and sparse semi-erect pale setae directed mainly forward. Mesoscutum mainly bare, with sparse relatively long and semi-erect white setae arranged narrowly marginally and rather widely along notauli. Hind tibia dorsally with relatively dense semi-erect white setae; length of these setae 0.5–0.9 × maximum width of hind tibia.

Colour. Body mainly black with some reddish small spots or stripes especially on metasoma; head with face dark reddish brown and with yellow-reddish rings around eyes. Antenna dark reddish brown to black in distal half or only quarter, yellow to light reddish brown in remaining proximal part. Palpi reddish brown in proximal half and yellow to light brown in distal half. Legs mainly reddish brown to partly dark reddish brown, hind coxa mainly dark reddish brown to almost black, all tibiae proximally yellow for short distance, tarsi mainly yellow to light brown. Ovipositor sheaths mainly or in distal half black, dark brown or reddish brown in proximal third or half. Fore wing mainly infuscate, with a few small hyaline spots and stripes, completely hyaline in proximal quarter. Pterostigma dark brown, yellow in proximal third.

Etymology. This species is named after the country where it was collected.

Comparative diagnosis. This new species is closely similar to Rh. aciculatus Ruthe , but differs from latter by the female’s long ovipositor distinctly longer than the metasoma and 0.8–0.9 × as long as the fore wing (short, not longer than metasoma and only 0.4–0.5 × as long as fore wing in Rh. aciculatus ); large body size, 4.1–5.4 mm (small size, 2.1–4.0 mm in Rh. aciculatus ); antenna with 37–39 antennomeres (with 28–31 antennomeres in Rh. aciculatus ); length of first metasomal tergite 1.3–1.5 × posterior width (1.1–1.3 × posterior width in Rh. aciculatus )

Figures

FIGURE 1. Rhaconotus (Rhaconotus) koreanus, sp. nov. (holotype, female). A. Habitus, dorsal view. B. Head, lateral view. C. Head, front view. D. Head, dorsal view. E. Apical antennomeres. F. Basal antennomeres. G. Mesosoma, dorsal view. H. Mesosoma, lateral view. I. Coxa and femur of hind leg. J. Tibia of hind leg.

FIGURE 2. Rhaconotus (Rhaconotus) koreanus, sp. nov. (holotype, female). A. Wings. B. Metasoma, dorsal view. C. Metasoma, lateral view.