Bracon coarctatus
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Ordo: Hymenoptera
Familia: Braconidae
Genus: Bracon
Name
Bracon coarctatus Li & He & Chen, 2020 sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype. ♀, China, Jilin Prov., Mt. Changbai, 4–20.VIII.1993, Lou Juxian, No. 976388 (ZJUH).
Diagnosis
This new species is very similar to B. (L.) histeromeroides Sarhan & Quicke, 1990, but can be separated from the latter by the following characters: mesosoma in lateral view 2.2× as long as high (1.4× in B. (L.) histeromeroides); second metasomal tergite with longitudinal striae medio-basally (slightly “pinched-up” medio-basally, otherwise without sculpture); setose part of ovipositor sheath about as long as metasoma (half as long as metasoma); metasomal tergites largely blackish-brown, second to seventh tergites yellow laterally (entirely darkish brown).
Description
Holotype, ♀, length of body 3.4 mm, of fore wing 2.6 mm, of ovipositor sheath 1.7 mm.
Head. Antenna with 25 segments; apical antennal segment slightly acute, 1.8× longer than its maximum width (Fig. 16m); first flagellomere 1.6× longer than wide, 1.0 and 1.1× longer than second and third, respectively, the latter being 1.3× longer than wide; malar suture rather weak, with dense short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 3: 13: 5; clypeus sparsely short setose; eye not emarginate (Fig. 16g); face largely weakly granulate, but medially smooth and with sparse short setae laterally (Fig. 16g); eye height: shortest distance between eyes: head width = 12: 17: 30; frons weakly granulate, hardly concave behind antennal sockets, with a rather weak median groove (Fig. 16h); 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: 8; temples weakly narrowed behind eyes (Fig. 16h).
Mesosoma. Length of mesosoma 2.2× its height (Fig. 16c); notauli impressed anteriorly, rather shallow posteriorly (Fig. 16d); mesoscutum smooth, with sparse short setae along notaulic courses (Fig. 16d); scutellar sulcus deep, moderately wide, with crenulae (Fig. 16d); scutellum smooth, with some short setae posteriorly; metanotum moderately convex medially (Fig. 16d); propodeum largely smooth, with a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 16j).
Wings. Fore wing (Fig. 16a): SR1 not reaching tip of wing; SR1: 3-SR: r = 26: 15: 6; 1-SR+M more or less straight, 1.8× longer than 1-M; 2-SR: 3-SR: r-m = 10: 15: 6; m-cu straight, 1.8× longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a more or less interstitial. Hind wing (Fig. 16b): SC+R1: 2-SC+R: 1r-m = 11: 3: 4.
Legs. Length of fore femur: tibia: tarsus = 14: 18: 21; length of hind femur: tibia: basitarsus = 23: 36: 15; length of femur, tibia and basitarsus of hind leg 2.9, 9.0 and 7.5× their maximum width, respectively; hind tibial spurs 0.3 and 0.4× as long as hind basitarsus.
Metasoma. Length of first tergite 1.2× its apical width; first tergite concave medio-basally, median area convex and largely smooth, but rugose posteriorly (Fig. 16k); lateral grooves of first tergite moderately wide, with sparse crenulae (Fig. 16k); second tergite largely smooth but medio-anteriorly rugose (Fig. 16e); median length of second tergite slightly shorter than that of third tergite; second metasomal suture narrow, only crenulate medially, straight medially (Fig. 16e); third to seventh tergites smooth (Fig. 16e); setose part of ovipositor sheath 0.7× as long as fore wing.
Colour. Largely blackish-brown (Fig. 15); head largely yellow, antenna, eyes, mandible apically, frons medially, surroundings of stemmaticum and temples (but laterally yellow) blackish-brown (Fig. 16g, h); legs largely yellow, claws, hind tibia apically and hind tarsus dark brown (Fig. 16f); second to seventh metasomal tergites laterally yellow (Fig. 16e); wing membrane pale yellow, pterostigma dark brown and veins yellowish-brown to dark brown (Fig. 16a, b).
Biology
Unknown.
Distribution
China (Jilin).
Etymology
Named after the compressed mesosoma: “coarctatus” is Latin for “compressed”.
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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