Bracon leptotes
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Ordo: Hymenoptera
Familia: Braconidae
Genus: Bracon
Name
Bracon leptotes Li & He & Chen, 2020 sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype. ♀, China, Fujian Prov., Mt. Wuyi, Tongmu, 14.VII.1994, Chen Xuexin, No. 942349 (ZJUH). Paratype. 1♀, same data as holotype, No. 942303 (ZJUH).
Diagnosis
This new species is very similar to B. (G.) arcuatus Thomson, 1892, but can be separated from the latter by the following characters: fore wing second submarginal cell medium-sized, vein 3-SR 1.7× as long as vein 2-SR (short, vein 3-SR slightly longer than (rarely as long as) vein 2-SR in B. (G.) arcuatus); setose part of ovipositor sheath distinctly longer than hind tibia + basitarsus combined, as long as or slightly longer than hind tibia + tarsus combined (as long as hind tibia + basitarsus combined and shorter than hind tibia + tarsus combined); first metasomal tergite 1.2× longer than its apical width, lateral grooves with sparse crenulae, remainder of tergite smooth (quadrate or nearly so, slightly longer than or as long as its apical width, lateral grooves with distinct crenulae and tergite with median and lateral areas rugose).
Description
Holotype, ♀, length of body 2.5 mm, of fore wing 3.0 mm, of ovipositor sheath 1.1 mm.
Head. Antenna with 28 segments; apical antennal segment strongly acute, 3.3× longer than its maximum width (Fig. 6k); first flagellomere 2.5× longer than wide, 1.2 and 1.3× longer than second and third, respectively, the latter being twice longer than wide; malar suture rather weak, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 3: 8: 4; clypeus sparsely short setose; eye not emarginate (Fig. 6g); face largely smooth except for a few weak punctures laterally and anteriorly and with sparse short setae (Fig. 6g); eye height: shortest distance between eyes: head width = 14: 14: 29; frons largely smooth except for a few weak punctures anteriorly, slightly concave behind antennal sockets, with a rather weak median groove (Fig. 6h); vertex smooth, with sparse short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 4: 3: 6; temples strongly narrowed behind eyes (Fig. 6h).
Mesosoma. Length of mesosoma 1.6× its height (Fig. 6c); notauli only impressed anteriorly (Fig. 6d); mesoscutum smooth, with sparse setae posteriorly and along imaginary notaulic courses (Fig. 6d); scutellar sulcus deep, narrow, with crenulae (Fig. 6d); scutellum smooth, with some setae; metanotum moderately convex medially (Fig. 6d); propodeum largely smooth, with a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 6d).
Wings. Fore wing (Fig. 6a): SR1: 3-SR: r = 26: 15: 5; 1-SR+M straight, 1.3× longer than 1-M; 2-SR: 3-SR: r-m = 9: 15: 5; m-cu straight, 2.0× longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a interstitial. Hind wing (Fig. 6b): SC+R1: 2-SC+R: 1r-m = 19: 4: 11.
Legs. Length of fore femur: tibia: tarsus = 17: 20: 29; length of hind femur: tibia: basitarsus = 21: 26: 10; length of femur, tibia and basitarsus of hind leg 3.8, 8.2 and 4.7× their maximum width, respectively; hind tibial spurs 0.2 and 0.3× as long as hind basitarsus.
Metasoma. Length of first tergite 1.2× its apical width; first tergite concave medio-basally, median area convex and smooth (Fig. 6j); lateral grooves of first tergite very wide, with sparse crenulae (Fig. 6j); second tergite largely smooth except for some striae medially (Fig. 6e); median length of second tergite slightly longer than that of third tergite; second metasomal suture moderately wide, crenulate, weakly curved medially (Fig. 6e); third to seventh tergites smooth (Fig. 6e); ovipositor sheath 0.4× as long as fore wing.
Colour. Largely blackish-brown (Fig. 5); scapus, mandible (but apically black) and legs (but claws dark brown, hind tarsus somewhat infuscate) yellow (Figs 5, 6f, g); first metasomal tergite yellow, but median area brown (Fig. 6j); second tergite laterally yellow; ovipositor sheath black (Fig. 6e); wing membrane pale yellow, pterostigma and veins dark brown (Fig. 6a, b).
Variation. Length of body of female 2.5–3.2 mm, of fore wing of female 3.0–3.1 mm and of ovipositor sheath 1.1–1.4 mm; antenna of female with 28–31 segments; third metasomal tergite weakly rugose medially; ovipositor sheath 0.4–0.5× as long as fore wing; second metasomal tergite uniformly black brown.
Biology
Unknown.
Distribution
China (Zhejiang).
Etymology
Named after the slender ovipositor: “leptotes” is Greek for “slenderness”.
Original Description
- Li, Y; He, J; Chen, X; 2020: The subgenera Glabrobracon Fahringer, Lucobracon Fahringer and Uncobracon Papp of the genus Bracon Fabricius (Hymenoptera, Braconidae, Braconinae) in China, with the description of eleven new species Deutsche Entomologische Zeitschrift, 67(2): 209-252. doi
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