Doryctes (Doryctes) planus Belokobylskij et Ku, 2023

Belokobylskij, S. A. & Ku, D. - S., 2023, Some new braconid parasitoids (Hymenoptera: Braconidae) in the fauna of Korean Peninsula, Far Eastern Entomologist 483, pp. 1-18 : 3-8

Doryctes (Doryctes) planus Belokobylskij et Ku , sp. n.

https://zoobank.org/NomenclaturalActs/ 071016AC-389E-48E0-BF2F-8CCAC97DBBF6

Figs 1 , 2

TYPE MATERIAL. Holotype: ♀, “ Korea: [GG], Anseong-si , 31.III–14.VI 2018, Hyung-Keun Lee, MT ” ( NIBR). Paratypes. 1 ♀, “Korea [GB], Gyeongsan-si, Dae-dong, Yeongnam Univer. 25.IV 1988, J.-Y. Cha ” ( SMNE); 1 ♀, same locality and collector, but 21.VII 1986 ( SMNE); 1 ♀, “Korea [GG], Incheon-si, Junggu Muui-dong, 13.IV–27.IV 2017, Hyung-Keun Lee, MT, 37°23'46.09"N, 126°24' 36.38"E “ ( ZISP); 1 ♂, “Korea [GW], Goseong-gun, 06.III–20.III 2018, Hyung-Keun Lee, MT ” ( SMNE); 2 ♂, “Korea [ CN], Taean-gun, 18.III–01.IV 2018, Hyung-Keun Lee, MT ” ( SMNE, ZISP).

COMPARATIVE DIAGNOSIS. This new species is the most similar to the Western Palaearctic Doryctes planiceps Reinhard, 1865 , originally described on the base of single male from Königsberg (= Kaliningrad), but differs from it in having the palpi dark brown (pale in D. planiceps ), vertex distinctly and densely punctate (smooth in D. planiceps ), second tergite entirely and third in basal quarter densely evenly striate (only second tergite basally striate in D. planiceps ), antenna 31-segmented and shorter than body (41-segmented and 1.5 × longer than body in D. planiceps ), precoxal sulcus finely crenulate (smooth in D. planiceps ), length of first tergite 0.9–1.1 × its maximum apical width (1.5 × in D. planiceps ), second radiomedial (submarginal) cell long, 2.6–2.8 × longer than its maximum width (subsquare and only weakly longer than its maximum width in D. planiceps ).

Also, Doryctes planus sp. n. is similar to Japanese D. (D.) nipponicus Belokobylskij et Maeto, 2009 (especially by wing venation), but differs from later in the vertex distinctly and densely punctate with dense setae (finely punctate, almost smooth, with sparse setae in D. nipponicus ), mesoscutum densely and distinctly punctate and usually finely coriaceous between punctulae at least partly, with wide rugulose-reticulate area in medioposterior 0.7 (finely punctate and smooth between punctulae, with narrow rugulose-reticulate area in medioposterior 0.5 only in D. nipponicus ), medial lobe of mesoscutum without longitudinal furrow (with distinct longitudinal furrow in D. nipponicus ), scutellum almost entirely longitudinally striate with rugulosity (entirely finely punctate to smooth in D. nipponicus ), precoxal sulcus finely crenulate (smooth in D. nipponicus ), hind coxa without medioventral tubercle (with distinct medioventral tubercle in D. nipponicus ), propodeum without or with indistinct areas delineated by fine carinae (with areas delineated by coarse carinae in D. nipponicus ), third metasomal tergite basally without curved transverse striation (with such striation in D. nipponicus ), and palpi dark brown (pale in D. nipponicus ).

DESCRIPTION. Female. Body length 2.8–4.5 mm; fore wing length 2.4–3.8 mm.

Head. Head depressed, its width (dorsal view) 1.3–1.5 × median length, 1.3–1.4 × maximum height (without mandibles), 0.85–0.90 × maximum width of mesoscutum. Vertex flat or weakly convex. Head behind eyes (dorsal view) weakly convex in anterior half and roundly narrowed in posterior half. Transverse diameter of eye 1.0–1.1 × as long as temple (dorsal view). Ocelli medium-sized, arranged in triangle with base 1.4–1.5 × its side. POL 2.2–2.5 × OD, 1.1–1.2 × OOL. Eye glabrous, with very weak emargination opposite of antennal socket, 1.2–1.3 × as high as broad. Malar space 0.30–0.35 × height of eye, about 0.7 × as long as basal width of mandible. Malar suture absent. Face width 1.1–1.2 × height of eye, 1.3–1.5 × height of face and clypeus combined. Hypoclypeal cavity subround, its diameter 1.0–1.3 × distance from margin of cavity to border of eye, 0.3–0.4 × as long as width of face. Occipital carina complete dorsally, obliterated below at rather long distance and not fused with hypostomal carina.

Antenna. Antenna weakly thickened, filiform, 29–31-segmented, 0.8–1.0 × as long as body. Scape 1.6–1.7 × longer than its maximum width. First flagellar segment 3.5–4.0 × longer than its apical width, almost as long as second segment. Penultimate segment 2.5–2.7 × longer than its maximum width, 0.6 × as long as first flagellar segment, 0.8–0.9 × as long as apical segment; the latter acuminated apically.

Mesosoma. Length of mesosoma 2.6–3.3 × longer than its height. Pronotum dorsally distinctly convex (lateral view) and with high, rather narrow and divided medially pronotal lobe situated in posterior quarter or third of pronotum. Mesoscutum weakly and curvedly elevated above pronotum (lateral view), 0.8–0.9 × as long as maximum width (dorsal view). Median lobe of mesoscutum anteriorly distinctly convex but weakly protruding forwards (dorsal view). Notauli anteriorly rather distinct, but shallow, narrow and crenulate-rugulose, very shallow to indistinct in posterior 0.6–0.7. Prescutellar depression shallow to very shallow, short, with median and two or several lateral carinae, distinctly or weakly rugulose, 0.20– 0.25 × as long as scutellum. Scutellum flat, without lateral carinae. Subalar depression shallow, rather narrow, rugose-reticulate. Precoxal sulcus distinct, rather long, narrowly crenulate, without round cavity medially or posteriorly, running along anterior 0.7–0.8 of lower part of mesopleuron. Propodeum with low and wide lateral tubercles.

Wings. Fore wing 2.8–3.4 × longer than its maximum width. Pterostigma narrow, 4.5–4.8 × longer than maximum width. Radial (marginal) cell weakly shortened. Metacarp (1- R 1) 1.0–1.1 × as long as pterostigma. Radial vein (r) arising distinctly before middle of pterostigma, from its basal 0.35–0.40. Second radial abscissa (3- SR) forming obtuse angle with first radial abscissa (r) and 3.5–4.0 × longer than it, 0.6 × as long as third radial abscissa (SR1), 1.4–1.7 × longer than first radiomedial vein (3-SR). Second radiomedial (submarginal) cell relatively long and wide, 2.6– 3.3 × longer than its maximum width, 1.8–2.2 × longer than wide brachial (first subdiscal) cell. First medial abscissa (1-SR+M) weakly sinuate. Recurrent vein (m-cu) antefurcal, 5.0–9.0 × longer than second medial abscissa (2-SR+M), 0.8–0.9 × as long as first radiomedial vein (3-SR). Distance (1-CU1) between nervulus (cu-a) and basal vein (1-M) 0.8–1.1 × nervulus (cu-a) length. Parallel vein (CU1a) arising from posterior 0.3 of distal margin of brachial (first subdiscal) cell. Hind wing 3.9– 4.3 × longer than maximum width. First costal abscissa (C+SC+ R) 0.50–0.55 × as long as second abscissa (1-SC+ R). First abscissa of mediocubital vein (M+CU) 1.3– 1.6 × longer than second abscissa (1-M). Recurrent vein (m-cu) entirely straight, oblique, interstitial, brown.

Legs. Hind coxa without dorsal protuberance, below without medioventral tubercle, with basoventral tubercle, 1.4–1.6 × longer than maximum width. Hind femur 2.9–3.4 × longer than its maximum width. Hind tarsus 0.9 × longer than hind tibia. Hind basitarsus 0.6 × as long as second–fifth segments combined; second segment of hind tarsus 0.5 × as long as basitarsus, 1.2 × longer than fifth segment (without pretarsus).

Metasoma. Metasoma about as long as mesosoma and head combined. First tergite with distinct spiracular tubercles in basal 0.3, distinctly and almost linearly widened from base to apex. Length of first tergite 0.9–1.1 × its maximum apical width; maximum width 2.0–2.2 × its minimum basal width. Second tergite with shallow or very shallow and fine, straight, and weakly divergent posteriorly sublateral furrows; median length of second tergite 0.75–0.80 × its basal width, 1.4– 1.5 × length of third tergite. Suture between second and third tergites distinct and complete, rather shallow and narrow, weakly concave medially, with distinct, but not deep sublateral bends. Third tergite without depression. Ovipositor sheath 0.45– 0.50 × as long as metasoma, 0.55–0.60 × as long as mesosoma, and 0.20–0.25 × as long as fore wing.

Sculpture and pubescence. Vertex densely and almost entirely punctate by usually distinct punctulae with setae, smooth between punctulae, sometimes rugulose on ocellar triangle; frons distinctly transversely striate to almost smooth; face entirely and densely punctate, smooth between punctulae, but sometimes almost smooth on wide median area; temple mostly smooth, partly sparsely punctate. Mesoscutum densely and distinctly punctate with setae and usually finely coriaceous between punctulae at least partly; with wide and distinctly rugulose-reticulate area in medioposterior 0.7 and with more or less distinct and long median carina in posterior 0.8. Scutellum almost entirely longitudinally striate with rugulosity. Mesopleuron mainly smooth, rugulose in posterior quarter. Propodeum without or with areas delineated by fine carinae, entirely rugose-reticulate, but sometimes almost smooth in basal third or quarter. Hind coxae mainly rugose-reticulate, laterally and below finely sculptured till almost smooth partly; hind femur finely and sparsely punctate to smooth. First metasomal tergite entirely densely striate and with dense rugulosity between striae. Second tergite medially widely densely striate and partly with reticulation between striae, mainly smooth on narrow lateral stripes. Third tergite medially obliquely striate in basal one–fifth, smooth on remaining part. Remaining tergites entirely smooth. Vertex entirely densely covered by short white setae directed mainly to sides of head. Mesoscutum entirely with very dense and short white setae. Metapleuron medially widely glabrous, setose anteriorly and posteriorly. Hind tibia dorsally with dense, short and semi-erect pale setae, its length 0.4–0.5 × maximum width of hind tibia.

Colour. Body almost entirely black or dark reddish brown, head below and clypeus reddish brown or at least paler. Antenna black, basally reddish brown. Palpi dark reddish brown to dark brown, sometimes only reddish brown. Legs mainly dark reddish brown to dark brown, often faintly paler distally, hind tibia yellow basally at short distance. Ovipositor sheath black. Wings subhyaline, faintly infuscate at least partly. Pterostigma entirely dark brown or brown.

Male. Body length 2.8–3.4 mm; fore wing length 2.7–3.1 mm. Antenna 31–33- segmented. Propodeum widely reticulate in basal third. Metasoma slender. Length of first tergite 1.2–1.4 × its maximum apical width. Median length of second tergite 0.8–1.2 × its basal width, 1.5–1.6 × length of third tergite. Third tergite sculptured basally on wide part. Otherwise similar to female.

ETYMOLOGY. This species is named from Latin "planus " (= plane), because the body is strongly depressed and with flat and plane its dorsal surface.

DISTRIBUTION. Korean Peninsula.

Figures

Fig. 1. Doryctes planus sp. n. (♀, holotype). A – habitus, lateral view; B – head and anterior part of mesosoma, lateral view; C – head and anterior part of mesosoma, dorsal view; D – head, front view; E – basal segments of antenna; F – apical segments of antenna; G – mesosoma, dorsal view; H – mesosoma, lateral view; I – hind leg.

Fig. 2. Doryctes planus sp. n. (♀, holotype). A – wings; B – metasoma, dorsal view; C – metasoma, lateral view; D – ovipositor, lateral view.