Bracon indistinctus
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Li2020DeutscheEntomologischeZeitschrift67, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Li2020Deutsche Entomologische Zeitschrift67">{{Citation See also the citation download page at the journal. |
Ordo: Hymenoptera
Familia: Braconidae
Genus: Bracon
Name
Bracon indistinctus Li & He & Chen, 2020 sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype. ♀, China, Zhejiang Prov., Mt. Tianmu, Laodian-Xianrending, 1250–1547 m alt., 17–18.V.1988, Fan Jinjiang, No. 884381 (ZJUH).
Diagnosis
This new species is very similar to B. (G.) isomera (Cushman, 1931), but can be separated from the latter by the following characters: metasomal tergites largely dark brown (yellow to reddish-brown in B. isomera); second metasomal suture crenulate and sinuate (smooth and straight or weakly sinuate); propodeum with short medio-longitudinal carina posteriorly (without short medio-longitudinal carina posteriorly); fore wing vein cu-a slightly postfurcal (interstitial).
Description
Holotype, ♀, length of body 4.1 mm, of fore wing 4.2 mm, of ovipositor sheath 2.1 mm.
Head. Antenna with 36 segments; apical antennal segment with a short spine apically, 2.9× longer than its maximum width (Fig. 2n); first flagellomere 2.1× longer than wide, 1.1 and 1.2× longer than second and third, respectively, the latter being 1.5× longer than wide; malar suture rather weak, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 5: 11: 6; clypeus densely short setose; eye not emarginate (Fig. 2g); face smooth, with some short setae laterally (Fig. 2g); eye height: shortest distance between eyes: head width = 13: 17: 32; frons largely smooth, except for a few weak striae laterally, slightly concave behind antennal sockets, with a rather weak median groove (Fig. 2h); vertex smooth, with sparse short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 3: 3: 7; temples linearly narrowed behind eyes (Fig. 2h).
Mesosoma. Length of mesosoma 1.4× its height (Fig. 2c); notauli rather weak and only impressed anteriorly (Fig. 2d); mesoscutum smooth and with sparse setae along imaginary notaulic courses (Fig. 2d); scutellar sulcus deep, moderately wide, with crenulae (Fig. 2d); scutellum smooth, with some setae; metanotum moderately convex medially (Fig. 2d); propodeum largely smooth, with a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 2j).
Wings. Fore wing (Fig. 2a): SR1: 3-SR: r = 40: 25: 11; 1-SR+M more or less straight, 1.4× longer than 1-M; 2-SR: 3-SR: r-m = 18: 25: 9; m-cu straight, 1.8× longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a weakly postfurcal. Hind wing (Fig. 2b): SC+R1: 2-SC+R: 1r-m = 18: 3: 10.
Legs. Length of fore femur: tibia: tarsus = 26: 29: 35; length of hind femur: tibia: basitarsus = 35: 45: 17; length of femur, tibia and basitarsus of hind leg 4.4, 9.0 and 6.8× 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, median area convex, surface largely smooth, but well-defined grooves sparsely and weakly crenulate (Fig. 2k); lateral grooves of first tergite with sparse crenulae (Fig. 2k); medially second tergite approximately as long as third tergite; second metasomal suture narrow, sparsely and weakly crenulate, strongly curved medially (Fig. 2e); medially third tergite 0.3× as long as its apical width; second to seventh tergites smooth (Fig. 2e); setose part of ovipositor sheath 0.5× as long as fore wing.
Colour. Head largely blackish-brown, eye orbits and mandible (except its black apex) reddish-yellow (Fig. 2g, h); mesosoma largely reddish-yellow, propodeum anteriorly and posteriorly somewhat infuscate (Fig. 2c, d, j); legs largely blackish-brown, fore coxa and trochanter dark yellow; metasoma largely dark brown (Fig. 2e); first and second metasomal tergites relatively pale (Fig. 2e, k); ovipositor sheath black (Fig. 1); wing membrane infuscate, pterostigma and veins dark brown (Fig. 2a, b).
Biology
Unknown.
Distribution
China (Zhejiang).
Etymology
Named after the rather weakly developed notauli: “indistinctus” is Latin for “not distinct”.
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
Images
|
