Cosmophorus (Eucosmophorus) jejuensis, Belokobylskij & Ku, 2023

Belokobylskij, Sergey A. & Ku, Deokseo, 2023, Braconid imagobionts from the tribe Cosmophorini (Hymenoptera, Braconidae, Euphorinae) in the fauna of South Korea, Journal of Hymenoptera Research 96, pp. 129-154 : 129

Cosmophorus (Eucosmophorus) jejuensis sp. nov.

Figs 1 , 2

Type material.

Holotype: female, "Korea (JJ), Muljangori, Bonggae-dong, Jeju-si, Jeju-do, VIII.12-VIII.29.2017 (Malaise Trap) [Hyung-Keun Lee leg.]" (NIBR).

Paratypes: 1 female, "Korea (JJ), Mulyeongari, Sumang-ri, Namwon-up, Seoqwipo-si, Jeju-do, VI.03-VI.17.2017 (Malaise Trap) [Hyung-Keun Lee leg.]" (SMNE).

Description.

Female. Body length 2.4-3.0 mm; fore wing length 1.7-2.2 mm.

Head: Width of head 1.3-1.4 times its median length, equal to its maximum length, 1.35-1.45 times its maximum height (without mandible), 1.3 times width of meso-scutum. Vertex with wide and shallow medial longitudinal depression. Occiput strongly concave. Temples behind eyes weakly convex in anterior 1/2-3/5, than weakly and roundly narrowed, 1.1-1.3 times longer than transverse diameter of eye. Frons medially distinctly concave, with distinct, relatively low, but higher anteriorly, median longitudinal carinae, which distinctly divergent anteriorly at short distance on antennal sockets. Ocelli medium-sized, arranged in triangle with base 1.4-1.5 times its lateral sides; posterior margin of anterior ocellus placed weakly before line between anterior margins of lateral ocelli. POL 2.8-3.0 times Od, 1.3-1.4 times OOL. Eye subround, Eye with rather sparse and short setae, 1.05-1.15 times as high as broad. Malar suture invisible. Malar space very narrow, 0.10-0.15 times height of eye, 0.1-0.2 times basal width of mandible. Antennal protuberances with one wide, relatively long and acuminate apical antero-medial tooth. Clypeus very narrow, almost straight ventrally. Upper tentorial pit rather distinct, situated between eye and antennal socket and almost connected with socket its outer border. Face 2.0-2.4 times wider than its medial height with antennal protuberances. Mandible wide, widened towards basal 3/5-2/3 and then strongly narrowed towards apex, with distinct submedial ventral corner and small tubercle on lower margin, with small but wide corner in upper margin, with two apical teeth, upper tooth short and obtuse, lower tooth longest and acuminate. Length of mandible 2.0 times its maximum submedial width. Occipital carina present only in ventral 1/3, absent widely upper and upper-laterally, below fused with distinct hypostomal carina.

Antenna: Antenna slender, almost filiform, 18-20-segmented, flagellum weakly compressed and segment concave below (if antenna directed posteriorly). Scape subcylindrical, distinctly widened towards apex (lateral view), not depressed, with two distinct and acuminate teeth on its anterior apical side; length of scape 1.5-1.6 times its maximum width (lateral view), 1.3-1.5 times longer than rather narrow pedicel. First flagellar segment 3.3-3.8 times longer than its apical width, 1.1-1.3 times longer than widened second segment. Second flagellar segment 2.2 times longer than its maximum width. Length of penultimate segment 2.5-3.0 times its width, 1.2-1.3 times longer than shortened apical segment; the latter weakly acuminate or obtuse.

Mesosoma: Length of mesosoma 1.9-2.1 times its maximum height. Dorsal part of mesosoma weakly convex (lateral view). Oblique short and crenulate notauli present only on vertical part of mesoscutum, completely absent on its horizontal part. Prescutellar depression short, with six-seven carinae, smooth between carinae, 0.2-0.3 times as long as scutellum. Scutellum without posterior transverse depression, completely smooth. Subalar depression distinct but shallow, rather narrow, densely reticulate-rugose and sometimes with oblique striation. Precoxal sulcus distinct, long, narrow, crenulate-rugulose, strongly curved up in posterior 2/3 and prolonged towards mesopleural pit and pleural suture. Prepectal carina present but fine.

Wings: Length of fore wing 2.6-2.9 times its width. Length of pterostigma 2.7-3.1 times its maximum width. Metacarp (1-R1) strongly desclerotised and lost distally. Radial (marginal) cell strongly shortened, open apically; anterior margin of radial (marginal) cell 0.9-1.0 times as long as pterostigma and 1.7-2.4 times as long as distance from apex of radial (marginal) cell to apex of wing. Radial vein (r) arising behind middle of pterostigma, its first abscissa (r) more or less distinctly thickened and short, 0.3-0.4 times as long as maximum width of pterostigma. Second abscissa of radial vein (3-SR + SR1) evenly regularly curved and transparent (discolored), absent apically at short distance. Parallel vein (CU1a) straight and unsclerotised, interstitial to mediocubital vein (2-CU1). Recurrent vein (m-cu) forming usually weak obtuse corner with first radiomedial vein (2-SR). Nervulus (cu-a) short and postfurcal, distance from basal vein (1-M) to nervulus (cu-a) almost equal to nervulus (cu-a) length. Hind wing 4.2-4.8 times longer than wide. Second abscissa of costal vein (1-SC+R) almost absent in basal 1/3 and present but strongly desclerotised in apical 2/3; fourth abscissa of costal vein (SC+R1) strongly desclerotised in distal 4/5. Submedial (subbasal) cell distally open. Recurrent vein (m-cu) straight, sclerotised, mainly pigmented and almost interstitial.

Legs: Hind femur 3.2-3.3 times longer than wide. Hind tarsus almost equal to hind tibia, its second segment 0.4 times as long as first segment, approximately as long as fifth segment (without pretarsus).

Metasoma: First tergite of metasoma relatively long, weakly curvedly widened to middle and then narrowed (sometimes weakly) towards apex, spiracular tubercles absent, dorsope almost absent. Apical width of first tergite 0.85-0.90 times its maximum medial width, almost equal to or 1.2 times large than its minimum width, length 1.9-2.0 times its apical width and 1.2-1.4 times length of propodeum. Suture between second and third tergites present, but very shallow. Length of second tergite approximately equal to its basal width, 1.0-1.1 times length of third tergite. Ovipositor compressed, with 3 arcuate and not equivalent sections in apical 1/5 (missing in holotype), distal section longest and crescent. Ovipositor sheath not widened in apical quarter, approximately as long as metasoma, 1.5-1.7 times longer than mesosoma, 0.7 times as long as fore wing.

Sculpture and pubescence: Head entirely smooth. Sides of pronotum coarsely reticulate-rugose in lower half or medially and in posterior 1/5, smooth on remaining upper and lower parts. Mesoscutum finely and densely punctate on anterior vertical part, entirely smooth on posterior horizontal surface; scutellum entirely smooth. Mesopleuron mainly smooth. Propodeum entirely reticulate-rugulose or reticulate-punctate, with small and almost smooth areas latero-posteriorly or submedially, with longitudinal medial carina in basal 1/2-3/5 and almost semi-circular areola in posterior 2/5. Legs smooth. First metasomal tergite entirely densely reticulate-rugulose. Second tergite mainly longitudinally striate, with sparse fine punctation medially, sometimes almost smooth in small antero-lateral areas. Remaining tergites smooth. Vertex medially widely glabrous, laterally with sparse, short and semi-erect pale setae directed laterally; mesoscutum almost entirely with short and relatively densely white setae.

Colour: Body mainly dark reddish brown to dark brown, metasoma ventrally brown to partly pale brown; mandible, antennal socket (sometimes only their lower part) and lower half of prothorax yellow to yellowish brown. Antennae mainly dark brown to black, four basal segments yellow to brownish yellow. Palpi pale yellow. Legs yellow to pale brown, femora mainly brown or pale reddish brown. Ovipositor sheath dark brown to black. Wings very faintly evenly infuscate, subhyaline. Pterostigma dark brown, pale basally at short distance.

Male. Unknown.

Comparative diagnosis.

The new species is similar to C. (Eu.) constrictus (van Achterberg, 2000) from Malaysia (Sabah) ( van Achterberg and Quicke 2000) in their shape of the head in dorsal view and shape of the first metasomal tergite, but differ from each other by having the first flagellar segment 1.2 times longer than the second segment (1.6 times in C. constrictus ), second flagellar segment in front view 2.5 times longer than its width and only weakly wider than the first segment (2.0 times longer and twice wider in C. constrictus ), first and second flagellar segments yellow (dark brown in C. constrictus ), upper teeth of the scape subpointed apically (obtuse apically in C. constrictus ), mandible practically not twisted apically with the first tooth large (strongly twisted apically and with a small first tooth in C. constrictus ), mesosoma 2.1 times longer than the height (1.8 times in C. constrictus ), precoxal sulcus distinctly crenulate (finely crenulate in C. constrictus ), prescutellar depression distinctly crenulate (finely crenulate in C. constrictus ), radial vein (r) arising weakly behind the middle of pterostigma (weakly before middle in C. constrictus ), and second metasomal tergite shorter, 1.1 times longer than anterior width (longer, 1.3 times longer in C. constrictus ).

Cosmophorus (Eucosmophorus) jejuensis sp. nov. is also very similar to the South Japanese C. (Eu.) undulatus Belokobylskij, 2000 ( Belokobylskij 2000a: 24; 2000b: 372; Yu et al. 2016) (Figs 3 , 4 ), but differs from the latter species by having the first flagellar segment 1.1-1.3 times longer than the second segment (1.6 times in C. undulatus ), the first tergite widened to its middle and then narrowed towards the apex, apical width of this tergite 1.05-1.20 times large than its minimum width (evenly widened towards apex, and its apical width 1.5 times large than its minimum width in C. undulatus ), the ovipositor sheath 1.5-1.7 times longer than mesosoma and 0.7 times as long as the fore wing (1.2 and 0.9 times correspondingly in C. undulatus ).

Etymology.

This species is named after its type locality, Jeju Island

Distribution.

Korean Peninsula (Jeju Island).

Figures

Figure 1. Cosmophorus (Eucosmophorus) jejuensis sp. nov. (female, holotype) A habitus, lateral view B habitus, dorsal view C head, front view D head, dorsal view E head and antenna, lateral view F face and mandible, front view G propodeum, first and second metasomal tergites, dorsal view H mesosoma, dorsal view I mesosoma, lateral view J tip of ovipositor, lateral view K hind leg.

Figure 2. Cosmophorus (Eucosmophorus) jejuensis sp. nov. (female, holotype) A fore wing B hind wing C metasoma, dorsal view D metasoma, lateral view.

Figure 3. Cosmophorus (Eucosmophorus) undulatus (Belokobylskij, 2000) (female, holotype) A habitus, lateral view B head, front view C head, dorsal view D head, lateral view E antenna, lateral view F mesosoma and first tergite, dorsal view G head and mesosoma, lateral view H tip of ovipositor, lateral view.

Figure 4. Cosmophorus (Eucosmophorus) undulatus (Belokobylskij, 2000) (female, holotype) A wings B metasoma, dorsal view C propodeum and metasoma, lateral view.