Syntomernus flavus, Samartsev & Ku, 2020

Samartsev, Konstantin & Ku, Deok-Seo, 2020, New species of the genera Bracon Fabricius and Syntomernus Enderlein (Hymenoptera, Braconidae, Braconinae) from South Korea, ZooKeys 999, pp. 1-47 : 1

Syntomernus flavus sp. nov. Figs 127-133 , 134-141

Type material.

Holotype. South Korea - Gyeonggi-do • female; Gapyeong-gun, [14] Cheongpyeong-myeon, Cheongpyeong-ri, Cheongpyeong Amusement Park; 14 Jun. 1992; D.-S. Ku leg.; 541; NIBR.

Paratypes. 3 females, 1 male. South Korea - Gangwon-do • 1 female; Yeongwol-gun, [11] Kimsatgat-myeon, Nae-ri, Town Gijeon; 28 May 1998; Jeong-Gyu Kim leg.; 20; SMNE. - Gyeonggi-do • 1 female; Suwon-si, [15] Gwonseon-gu, Seodun-dong, Yeogisan Mountain; 14 Aug. 1995; J.Y. Choi leg.; Malaise trap; 1201; SMNE. - Gyeongsangnam-do • 1 female; Geochang-gun, [26] Geochang-eup, Songjeong-ri; 35.6712, 127.885; 3 Jun. 2019; K. Samartsev leg.; forest on a mountain; B0080; ZISP • 1 male; Geoje-si, [30] Dongbu-myeon, Hakdong-ri; 23 Jun. 1990; D.-S. Ku leg.; 18; SMNE.

Etymology.

The Latin flavus for (pale) yellow refers to entirely light-coloured body characterising the new species.

Description.

Female. Body length 3.3-3.8 mm; fore wing length 3.9-4.0 mm.

Head. Width of head (dorsal view) 2.0-2.1 × its median length. Transverse diameter of eye (dorsal view) 2.2-2.8 × longer than temple. Eyes with sparse, short setae. OOL 2.7-3.1 × Od; POL 1.0-1.1 × Od; OOL 2.5-2.8 × POL. Frons with deep mid-longitudinal groove. Longitudinal diameter of eye in lateral view 1.2-1.3 × larger than its transverse diameter. Transverse diameter of eye (lateral view) 2.2-2.9 × longer than minimum width of temple, hind margins of eye and temple parallel to broadened downwards. Face width 1.3-1.5 × combined height of face and clypeus; 2.1-2.2 × larger than width of hypoclypeal depression. Longitudinal diameter of eye 2.5-2.7 × longer than malar space (front view); malar space 0.85-0.92 × base of mandible. Malar suture absent. Width of hypoclypeal depression 1.1-1.2 × larger than distance from depression to eye. Clypeus separated from face by weak dorsal carina, flattened, with protruding ventral rim, height of clypeus 0.3-0.4 × width of hypoclypeal depression, clypeal sulcus absent, dorsal clypeal margin sharp. Maxillary palp longer than eye, but shorter than head.

Antenna 1.0-1.1 × longer than fore wing, with 34-36 antennomeres. First flagellomere 3.0-3.2 × longer than its apical width, 1.2-1.3 × longer than second flagellomere. Middle and penultimate flagellomeres 1.8-1.9 × and 1.9-2.1 × longer than wide, respectively. Apical flagellomere spiculate.

Mesosoma 1.4 × longer than its maximum height. Transverse pronotal sulcus smooth, deep anteriorly and posteriorly, smoothened medially. Notauli deep anteriorly, smoothened or absent posteriorly, not united. Mesoscutum setose on notauli and medio-posteriorly, anteromedially widely glabrous. Scutellar sulcus crenulate. Mesepimeral sulcus smooth or weakly crenulate, mesopleural pit weak, furrow-like. Median area of metanotum (dorsal view) with incomplete median carina. Metapleural sulcus smooth. Mid-longitudinal keel developed in apical half of propodeum, simple and high. Propodeal spiracle round, located behind middle of propodeum.

Wings. Fore wing 1.1-1.2 × longer than body. Pterostigma 3.1-3.7 × longer than wide. Vein r arising from basal 0.35-0.40 of pterostigma. Vein 1-R1 1.4-1.6 × longer than pterostigma. Marginal cell 10-25 × longer than distance from its apex to apex of wing. Vein 3-SR 1.4-2.1 × longer than vein r, 0.24-0.27 × as long as vein SR1, 0.8-1.1 × as long as vein 2-SR. Vein 1-M 0.65-0.70 × vein 1-SR+M, 1.9-2.5 × vein m-cu. 1.9-2.4 × longer than vein cu-a. Vein 2-SR+M 0.10-0.25 × as long as vein 2-SR, 0.25-0.50 × as long as vein m-cu. Vein 1-CU1 (posterior margin of discal cell) 2.8-3.6 × longer than vein cu-a. Vein cu-a interstitial or weakly postfurcal. Vein 2-1A of hind wing absent or very short; vein r-m weakly antefurcal.

Legs. Fore tibia with weakly thickened longitudinal and transverse apical rows of long setae. Hind femur 3.8-4.2 × longer than wide. Hind tibia 1.3 × longer than hind femur, without subapical row of thick setae, its inner spur 0.4-0.5 × as long as hind basitarsus. Hind tarsus 0.90-0.95 × as long as hind tibia. Fifth segment (without pretarsus) of hind tarsus 0.40-0.45 × as long as hind basitarsus and 0.87-0.94 × as long as second segment. Claws with large, protruding and blunt basal lobes.

Metasoma 1.2-1.4 × longer than mesosoma. Median length of first tergite (measured from petiolar tubercle) 0.75-0.90 × as large as its apical width. Dorsolateral carinae of first metasomal tergite developed, dorsal carinae complete. Median area of first tergite separated by rugose furrow, 0.6-0.7 × apical width of tergite, with distinct mid-longitudinal impression. Second tergite medially 1.1-1.2 × longer than third tergite and 0.65-0.85 × as large as apical width of first tergite. Basal width of second metasomal tergite 1.7-2.0 × larger than its median length. Median area of second tergite strongly elevated, elongate triangular, with sharp crenulate margin. Anterolateral areas of second tergite wide, transverse, rounded, weakly elevated, with crenulated margin. Dorsolateral impressions of second tergite deep, s-shaped, crenulated. Spiracle of second metasomal tergite located in middle of tergite. Suture between second and third tergites deep and wide, curved and rugose. Apical margins of third to sixth tergites thick, with deep, weakly crenulate transverse subapical grooves. Ovipositor sheath 2.7-3.1 × longer than hind tibia and 0.79-0.86 × as long as fore wing. Apex of ovipositor with developed nodus and ventral serration.

Sculpture. Most of head and mesosoma smooth. Face weakly granulate; gena smooth or weakly granulate in lower part, malar space granulate, frons smooth or weakly granulate. First metasomal tergite laterally smooth, its median area posteriorly rugose. Second tergite medially areolate-rugose, with smooth hind margin and elevated areas. Third-sixth tergites with weak papillary-like sculpture.

Colour. Body brownish yellow. Scape yellow, flagellum yellowish brown, apically darkening. Maxillary palps, fore coxa and tegulae pale yellow or yellow. Wing membrane weakly darkened, darker apically; pterostigma brown with large yellow patch basally, wing veins yellowish brown.

Male. Body length 3.2 mm; fore wing length 3.3 mm. Longitudinal diameter of eye 2.2 × longer than malar space (front view); malar space 0.8 × base of mandible. Antenna 1.3 × longer than fore wing, with 35 antennomeres. First flagellomere 4.1 × longer than its apical width. Middle flagellomeres 2.5 × longer than wide. Pterostigma 2.4 × longer than wide. Median length of first tergite (measured from petiolar tubercle) 0.95 × as large as its apical width.

Diagnosis.

The new species is remarkable by the light colouration of body, basally yellow and apically brown pterostigma, weakly sculptured elevated areas of second metasomal tergite and glabrous median lobe of mesoscutum.

Figures

Figures 127 - 133. Syntomernus flavus sp. nov. (127 - 131 holotype, NIBR 132, 133 paratype, female, SMNE) 127 habitus, lateral view 128 head, front view 129 base of antenna 130 head and mesosoma, lateral view 131 head, dorsal view 132 head, ventrolateral view 133 propodeum, dorsal view. Scale bars: 1 mm (127); 0.5 mm (128 - 132); 0.25 mm (133).

Figures 134 - 141. Syntomernus flavus sp. nov. (134 - 136 holotype, NIBR 139 - 141 male paratype, SMNE) 134 wings 135 hind tarsus 136 second and third metasomal tergites, dorsal view 137 apex of ovipositor 138 first and second metasomal tergites, dorsolateral view 139 habitus, lateral view 140 metasoma, dorsolateral view 141 head, front view. Scale bars: 1 mm (134, 139); 0.5 mm (135 - 138, 140, 141); 0.25 mm (137).