Bracon (Bracon) yeogisanensis, 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

Bracon (Bracon) yeogisanensis sp. nov. Figs 25-32 , 33-40

Type material.

Holotype. South Korea - Gyeonggi-do • female; Suwon-si, [15] Gwonseon-gu, Seodun-dong, Yeogisan Mountain; 11 May 1994; D.-S. Ku leg.; 867; NIBR.

Paratypes. (21 females, 9 males). South Korea - Gangwon-do • 1 female; Goseong-gun, [6] Toseong-myeon, Sinpyeong-ri, Seoraksan Mountain; 2 Aug. 2002-19 Oct. 2002; D.-S. Ku leg.; Malaise trap; 888; SMNE. - Gyeonggi-do • 4 males; same data as for holotype; 22 Apr. 1994; 891, 892, 893, 895; SMNE • 1 female; same data as for holotype; 29 Apr. 1994; 874; ZISP • 4 females; same data as for holotype; 864, 866, 868, 873; SMNE • 3 males; same data as for holotype; 869, 871, 872; SMNE • 1 male; same data as for holotype; 870; ZISP • 1 female; same data as for holotype; 11-19 May 1994; 879; SMNE • 1 female; same data as for holotype; 19-26 May 1994; 878; SMNE • 1 female; same data as for holotype; 27 May 1996; June-Yeol Choi leg.; Malaise trap; 882; SMNE • 1 female; same data as for holotype; 29 May-6 Jul. 1994; Malaise trap; 877; SMNE • 1 female; same data as for holotype; 16-23 Jun. 1994; 889; SMNE • 1 female; same data as for holotype; 23-29 Jun. 1994; Malaise trap; 890; SMNE • 2 females; same data as for holotype; 10 Jul. 1995; June-Yeol Choi leg.; Malaise trap; 885, 886; SMNE • 1 female; same data as for preceding; 887; ZISP • 1 female; same data as for preceding; 11 Jul. 1997; 884; SMNE • 1 female; same data as for preceding; 14 Aug. 1995; 883; SMNE • 2 females; Suwon-si, [16] Gwonseon-gu, Seodun-dong; 3-11 May 1994; D.-S. Ku leg.; 875, 876; SMNE • 1 male; same data as for preceding; 15 Jun. 1994; 894; SMNE • 1 female; Hwaseong-si, [17] Bibong-myeon; 1 Jun. 1994; D.-S. Ku leg.; 880; SMNE. - Jeollabuk-do • 1 female; Jinan-gun, [24] Bugwi-myeon, Sedong-ri, Moraejae Tunnel; 16 Jun. 1996; D.-S. Ku leg.; 881; SMNE.

Etymology.

The name refers to Yeogisan Mountain, the type locality of the species.

Description.

Female. Body length 2.5-3.1 mm; fore wing length 2.9-3.3 mm.

Head. Width of head (dorsal view) 1.7-1.9 × its median length. Transverse diameter of eye (dorsal view) 1.7-1.9 × longer than temple. Eyes with sparse, short setae. OOL 2.2-2.5 × Od; POL 1.2-1.5 × Od; OOL 1.6-1.9 × POL. Frons with weak mid-longitudinal groove. Longitudinal diameter of eye in lateral view 1.3 × larger than its transverse diameter. Transverse diameter of eye (lateral view) 2.1-2.3 × longer than minimum width of temple, hind margins of eye and temple parallel or slightly broadened downwards or upwards. Face width 1.6-1.8 × combined height of face and clypeus; 1.8-2.2 × larger than width of hypoclypeal depression. Longitudinal diameter of eye 3.2-3.5 × longer than malar space (front view); malar space 0.6-0.7 × base of mandible. Malar suture absent. Width of hypoclypeal depression 1.5-1.9 × larger than distance from depression to eye. Clypeus not separated from face by dorsal carina, clypeal sulcus impressed, dorsal clypeal margin sharp. Clypeus prominent, with protruding ventral rim, height of clypeus 0.2-0.3 × width of hypoclypeal depression. Maxillary palp longer than eye, but shorter than head.

Antenna 0.77-0.82 × as long as fore wing, with 23-25 antennomeres. First flagellomere 2.1-2.9 × longer than its apical width, 1.1-1.3 × longer than second flagellomere. Middle and penultimate flagellomeres 1.7-2.2 × and 1.5-2.0 × longer than wide, respectively. Apical flagellomere spiculate.

Mesosoma 1.5-1.6 × longer than its maximum height. Transverse pronotal sulcus deep and anteriorly crenulate. Notauli very deep and crenulate anteriorly, shallowly impressed and smooth posteriorly. Mesoscutum widely setose mid-longitudinally, on notauli and laterally and evenly setose medioposteriorly. Scutellar sulcus crenulate, mesepimeral sulcus weakly crenulate, metapleural sulcus crenulate. Mesopleural pit small or weakly impressed and separated from mesepimeral sulcus. Median area of metanotum (dorsal view) with incomplete median carina. Propodeum with short and branching mid-longitudinal keel apically and weakly foveate or crenulated mid-longitudinal impression in basal half.

Wings. Fore wing 1.1-1.2 × longer than body. Pterostigma 2.3-2.8 × longer than wide. Vein r arising from basal 0.35-0.45 of pterostigma length. Vein 1-R1 1.7-1.8 × longer than pterostigma. Marginal cell ca. 10-20 × longer than distance from its apex to apex of wing. Vein 3-SR 1.7-2.0 × longer than vein r, 0.42-0.46 × as long as vein SR1, 1.1 × longer than vein 2-SR. Vein 1-M 0.74-0.77 × vein 1-SR+M, 2.3-2.6 × vein m-cu. 2.0-2.4 × longer than vein cu-a. Vein 2-SR+M 0.08-0.16 × as long as vein 2-SR, 0.20-0.45 × as long as vein m-cu. Vein 1-CU1 (posterior margin of discal cell) 2.4-2.7 × 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 antefurcal.

Legs. Fore tibia with wide row of long thick setae and transverse apical row of thick setae. Hind femur 3.0-3.8 × longer than wide. Hind tibia without subapical row of thick setae, 1.4-1.5 × longer than hind femur, its inner spur 0.35-0.37 × as long as hind basitarsus. Hind tarsus almost as long as hind tibia, its fifth segment (without pretarsus) 0.37-0.43 × as long as hind basitarsus and 0.75-0.80 × as long as second segment. Claws with acute angularly protruding basal lobe.

Metasoma 1.0-1.2 × longer than mesosoma. Median length of first tergite (measured from petiolar tubercle) 0.7-0.8 × as large as its apical width. Dorsolateral carinae of first metasomal tergite developed; dorsal carinae incomplete and weakly curved toward apex of tergite. Median area of first tergite separated by rugose furrow, 0.6-0.7 × apical width of tergite. Second tergite medially 1.00-1.15 × as long as third tergite and 0.7-0.9 × as large as apical width of first tergite, with shallow s-shaped dorsolateral crenulated impressions. Basal width of second metasomal tergite 1.4-1.6 × larger than its median length. Suture between second and third tergites deep and wide, curved and crenulate. Apical margins of third to sixth tergites thick, with deep crenulate transverse subapical grooves. Ovipositor sheath 1.2-1.4 × longer than hind tibia and 0.33-0.47 × as long as fore wing. Apex of ovipositor with weak nodus and weak ventral serration.

Sculpture. Face and frons granulate. Gena and anterior half of vertex coriaceous. Mesopleuron almost smooth, weakly coriaceous or weakly granulate. Mesoscutum medio-posteriorly weakly granulate. Scutellum and metanotum smooth. Propodeum hardly coriaceous to smooth, with short rugae apically. First metasomal tergite laterally and posteriorly rugose; second to fifth tergites areolate-rugose or foveolate-rugose to rugulose-punctate or irregularly punctate; sixth tergite weakly irregularly punctate or almost smooth.

Colour. Body mainly dark brown. Most of scape, mandible, tegulae, fore and middle legs, trochanter and apex of femur of hind leg brownish yellow or yellowish brown. Maxillary palp and base of hind tibia pale yellow. Lateral margins of second and third metasomal tergite and seventh tergite brown or yellowish brown. Wing membrane brownish darkened; pterostigma brown, basally with small pale brown patch; wing veins brown.

Male. Body length 2.5-3.2 mm; fore wing length 2.5-3.1 mm. OOL 1.8-2.0 × Od, 1.3-1.5 × POL. Hind margins of eye and temple broadened upwards (lateral view). Longitudinal diameter of eye 3.9 × longer than malar space (front view). Mid-longitudinal keel developed in apical third of propodeum. Vein r-m of hind wing interstitial. Fifth segment (without pretarsus) of hind tarsus ca. 0.9 × as long as second segment. Median length of first tergite (measured from petiolar tubercle) 0.90-0.95 × as large as its apical width. Second tergite medially 1.1 × as large as apical width of first tergite. Basal width of second metasomal tergite 1.3-1.4 × larger than its median length. Apical metasomal segments as dark as proximal segments. Otherwise similar to female.

Diagnosis.

The new species belongs to a distinct species group including five species known from the Russian Far East, the Korean Peninsula and Japan ( Bracon acunens Papp, 2018, B. kunashiricus Tobias, 2000, B. sculptithorax Tobias, 2000, B. sulciferus Tobias, 2000, and B. yeogisanensis sp. nov.). The species share the following common characters: malar suture absent; face and frons granulate; gena, vertex, mesopleuron and mesoscutum partly with weak granulate or coriaceous sculpture; mesosoma elongate, 1.5-1.7 × longer than its maximum height; mesoscutum widely setose medially; notauli deep anteriorly and shallow posteriorly; precoxal sulcus vaguely or shallowly impressed; propodeum with crenulated or foveate mid-longitudinal impression in basal half and with branching mid-longitudinal keel in its apical half; marginal cell of fore wing not shortened, 6-25 × longer than distance from its apex to apex of wing; vein r arising distinctly before middle of pterostigma; vein 1-SR+M more or less curved anteriorly; vein cu-a interstitial or weakly postfurcal; wing membrane weakly brownish darkened; coxae without granulate sculpture; hind tibia without transverse apical row of thick setae apically; second segment of hind tarsus 1.1-1.3 × longer than fifth segment; claws with acute basal lobes; dorsolateral carinae of first metasomal tergite developed; median area of second tergite absent or very short and weak; dorsolateral s-shaped impressions of second tergite more or less distinct; suture between second and third tergites deep and crenulate; apical margins of third to sixth tergites thick; metasoma completely sculptured (areolate-rugose to irregularly punctate); ovipositor sheath 1.0-1.5 × as long as hind tibia, 0.3-0.5 × as long as fore wing. Differences between these species are listed in the key below.

Figures

Figures 25 - 32. Bracon (Bracon) yeogisanensis sp. nov. (holotype, NIBR) 25 habitus, lateral view 26 fore femur and tibia, front view 27 head, front view 28 head, dorsal view 29 head, lateral view 30 mesosoma, lateral view 31 head, ventrolateral view 32 mesosoma, lateroposterior view. Scale bars: 1 mm (25); 0.5 mm (27 - 32); 0.25 mm (26).

Figures 33 - 40. Bracon (Bracon) yeogisanensis sp. nov. (33 - 37 holotype, NIBR, 19, 40 male paratype, SMNE) 33 wings 34 mesosoma, dorsal view 35 hind leg, front view 36 propodeum and first metasomal tergite, dorsal view 37 Second and third metasomal tergites, dorsal view 38 apex of ovipositor, lateral view 39 habitus, lateral view 40 metasoma, dorsal view. Scale bars: 1 mm (33, 39); 0.5 mm (34 - 37, 40); 0.25 mm (38).

Figures 41 - 56. Bracon sculptithorax Tobias, 2000 (41, 45, 49, 53 holotype, ZISP), B. kunashiricus Tobias, 2000 (42, 46, 50, 54 holotype, ZISP), B. sulciferus Tobias, 2000 (43, 47, 51, 55 paratype, ZISP) and B. acunens Papp, 2018 (44, 48, 52 holotype, HNHM 56 female, SMNE) 41 - 44 head, front view 45 - 48 head and mesoscutum, dorsal view 49 - 52 head, lateral view 53 - 56 propodeum, dorsal view. Scale bars: 0.5 mm.

Figures 57 - 68. Bracon sculptithorax Tobias, 2000 (57, 61, 65 holotype, ZISP), B. kunashiricus Tobias, 2000 (58, 62, 66 holotype, ZISP), B. sulciferus Tobias, 2000 (59, 63, 67 paratype, ZISP) and B. acunens Papp, 2018 (60, 64 female, SMNE 68 holotype, HNHM) 57 - 60 mesosoma, lateral view 51 - 64 metasoma, dorsal view 65 - 68 fore wing apex. Scale bars: 0.5 mm (57 - 64); 1 mm (65 - 68).