Perilitus koreanus, Ku & Samartsev & Belokobylskij, 2020

Ku, Deok-Seo, Samartsev, Konstantin G. & Belokobylskij, Sergey A., 2020, New species of Euphorinae parasitoids of the family Braconidae (Hymenoptera) from South Korea, Zootaxa 4742 (2), pp. 256-270 : 263-265

Perilitus koreanus sp. nov.

Figs 5 , 6

Type material. Holotype: female, “ Korea, Gyeongnam Geoje Dongbu Pyongji, 4–5.VI.1997 (LT), Deok-Seo Ku ” ( NIBR).

Paratypes. 2 females, Korea, Gyeongnam Geoje-gun Nambu-myeon Dapo-ri, LT, 15–16.VII.1994 (S.-J. Hwang leg.) ( SMNE) ; 1 female, same label, but 15–16.VII.1994 (J.-S. Jeon leg.) ( SMNE) ; 2 females, South Korea, 19– 20.VI.2000 (E.-S. Kang leg.) ( SMNE, ZISP) ; 2 females, with label as in holotype ( SMNE, ZISP) ; 1 female, Korea, JeonNam Yeocheon-Gun, Dolsan-eup, Yulrim-ri, Impo (at U. V. lamp), 18–19.VII.1993 (D.-S. Ku leg.) ( SMNE) .

Description. Female. Body length 2.9–3.4 mm; fore wing length 2.5–2.9 mm.

Width of head (dorsal view) 1.8–1.9 × its median length, 1.3–1.4 × width of mesoscutum. Occiput weakly concave. Occipital carina complete dorsally, but rather fine. Temples behind eyes (dorsal view) strongly and weaklyroundly narrowed, transverse diameter of eye 2.0–2.1 × length of temple (2.6–2.7 × if measurement on straight line). Ocelli medium-sized, arranged in triangle with base 1.3–1.4 × its lateral sides; posterior margin of median ocellus placed just before level of anterior margins of lateral ocelli. POL 1.3–1.5 × Od, 0.8–1.0 × OOL. Eye with rather sparse and short setae, 1.25–1.30 × as high as broad. Malar suture present. Malar space very short, its height 0.3 × basal width of mandible, 0.07–0.08 × height of eye. Antennal tubercles short. Width of face 0.85–0.90 × its median height, 0.6 × height of eye. Tentorial pits distinct, distance between pits 5.0–5.7 × distance from pit to eye. Clypeus high, weakly convex, with narrow ventral flange. Width of clypeus 1.5–1.7 × its median height, 0.7–0.8 × width of face. Head strongly and almost linearly narrowed below eyes (front view).

Antenna filiform, 25–26-segmented, 0.8–0.9 × as long as body. First flagellar segment 3.1–3.5 × longer than its apical width, almost as long as second segment. Length of penultimate segment 1.5–1.8 × its width, 0.4–0.5 × length of first and 0.55–0.60 × length of apical segments. Apical segment acuminate apically, but without spine.

Mesosoma. Length 1.55–1.60 × its maximum height. Notauli distinct, not deep, narrow, complete, crenulate. Prescutellar depression long, with five distinct carinae, almost smooth or weakly rugulose between carinae, 0.30– 0.35 × as long as scutellum. Scutellum convex, with distinct transverse and weakly rugulose depression posteriorly. Sternaulus shallow, wide, entirely rugose-reticulate. Propodeum without lateral tubercles, strongly and convexroundly narrowed posteriorly (lateral view), with its posterior half almost perpendicular to anterior part, with distinct and rather deep wide median longitudinal depression in posterior half (dorsal view).

Wings. Length of fore wing 2.6–2.8 × its width. Length of pterostigma 4.2–4.3 × its maximum width. Radial (marginal) cell shortened, acuminate apically, 3.1 × longer than wide. Metacarpus (1-R1) 0.9–1.0 × as long as pterostigma, about 4.0 × longer than width of pterostigma, 2.5–3.5 × distance from apex of radial (marginal) cell to apex of wing. Second abscissa of radial vein (3-SR + SR1) evenly curved in basal one-third and almost straight in apical two-thirds; radial vein (r) arising almost from middle of pterostigma. First radial abscissa (r) about 0.7 × as long as maximum width of pterostigma, about 0.1 × as long as second abscissa (3-SR + SR1), 0.35 × as long as first radiomedial vein (2-SR). First abscissa of medial vein (1-SR+M) present, weakly sinuate or almost straight. Recurrent vein (m-cu) weakly postfurcal or sometimes subinterstitial. Distance from nervulus (cu-a) to basal vein (1-M) 0.5–0.7 × nervulus (cu-a) length. In hind wing, basal vein (1r-m) 1.8 × longer than third abscissa of costal vein (2-SC+R).

Legs. Hind femur 5.2–5.6 × longer than its maximum width. Hind tarsus 0.85–0.95 × as long as hind tibia, its second segment 0.45–0.50 × as long as first segment, 1.5–1.6 × longer than fifth segment (without pretarsus).

Metasoma. First tergite rather distinctly widened posteriorly, with small spiracular tubercles behind middle, without laterope and dorsope. Apical width of first tergite 2.6–3.0 × its minimum width, length 2.6–2.8 × its apical width, 1.6–1.8 × longer than propodeum (dorsal view). Length of second and third tergites combined 1.6–1.8 × basal width of second tergite. Ovipositor compressed, weakly curved down. Ovipositor sheath narrow, 1.2–1.5 × as long as first tergite, 0.8 × as long as hind tibia, 0.30–0.35 × as long as fore wing.

Sculpture and pubescence. Vertex and temple almost smooth, partly very finely coriaceous; frons entirely densely finely granulate; face densely punctate-granulate. Sides of pronotum mainly rugulose-reticulate, partly smooth below at narrow part. Mesoscutum almost smooth, rugulose-reticulate on rather large medioposterior area. Mesopleuron almost smooth on wide median area. Propodeum entirely rather densely and coarsely rugose-reticulate. Hind coxa mainly smooth, rugulose basally. First metasomal tergite almost entirely densely striate, smooth apically on narrow area. Median lobe of mesoscutum entirely densely setose, lateral lobes glabrous at most part.

Colour. Body brownish-yellow, meso- and metasoma dorsally faintly darker. Antenna yellow in basal quarter or half and light reddish-brown to reddish-brown on remaining part. Palpi yellow. Legs yellow. Wings hyaline. Pterostigma pale yellow.

Male. Unknown.

Comparative diagnosis. The new species is similar to Eastern Palaearctic P. aequorus Chen et van Achterberg, 1997 and differs in having the sternauli widely rugose-reticulate, frons and face densely and finally granulate, and body almost entirely light reddish-brown.

Etymology. This species is named in honour of country, Korea, where the new species was found.

Figures

FIGURE 5. Perilitus koreanus sp. nov. (female, holotype). A. Habitus, lateral view. B. Mesosoma, lateral view. C. Head, front view. D. Head, lateral view. E. Wings.

FIGURE 6. Perilitus koreanus sp. nov. (female, holotype).A. Head and mesoscutum, dorsal view. B. Propodeum, dorsal view. C. First and second metasomal tergites, dorsal view. D. Mesosoma, dorsal view. E. Metasoma, lateral view. F. Ovipositor, lateral view.