Bracon (Lucobracon) coarctatus, Li & He & Chen, 2020

Li, Yang, He, Jun-hua & Chen, Xue-xin, 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), pp. 209-252 : 209

publication ID

https://dx.doi.org/10.3897/dez.67.57668

publication LSID

lsid:zoobank.org:pub:41F77B2A-0E1C-4874-AE89-1E72B3DD6A32

persistent identifier

https://treatment.plazi.org/id/DC616BD4-CF09-47CB-BC72-FF850DBBA3CA

taxon LSID

lsid:zoobank.org:act:DC616BD4-CF09-47CB-BC72-FF850DBBA3CA

treatment provided by

Deutsche Entomologische Zeitschrift by Pensoft

scientific name

Bracon (Lucobracon) coarctatus
status

sp. nov.

Bracon (Lucobracon) coarctatus sp. nov. Figs 15 View Figure 15 , 16 View Figure 16

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 View Figure 16 ); 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 View Figure 16 ); face largely weakly granulate, but medially smooth and with sparse short setae laterally (Fig. 16g View Figure 16 ); 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 View Figure 16 ); 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 View Figure 16 ).

Mesosoma. Length of mesosoma 2.2 × its height (Fig. 16c View Figure 16 ); notauli impressed anteriorly, rather shallow posteriorly (Fig. 16d View Figure 16 ); mesoscutum smooth, with sparse short setae along notaulic courses (Fig. 16d View Figure 16 ); scutellar sulcus deep, moderately wide, with crenulae (Fig. 16d View Figure 16 ); scutellum smooth, with some short setae posteriorly; metanotum moderately convex medially (Fig. 16d View Figure 16 ); propodeum largely smooth, with a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 16j View Figure 16 ).

Wings. Fore wing (Fig. 16a View Figure 16 ): 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 View Figure 16 ): 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 View Figure 16 ); lateral grooves of first tergite moderately wide, with sparse crenulae (Fig. 16k View Figure 16 ); second tergite largely smooth but medio-anteriorly rugose (Fig. 16e View Figure 16 ); median length of second tergite slightly shorter than that of third tergite; second metasomal suture narrow, only crenulate medially, straight medially (Fig. 16e View Figure 16 ); third to seventh tergites smooth (Fig. 16e View Figure 16 ); setose part of ovipositor sheath 0.7 × as long as fore wing.

Colour. Largely blackish-brown (Fig. 15 View Figure 15 ); head largely yellow, antenna, eyes, mandible apically, frons medially, surroundings of stemmaticum and temples (but laterally yellow) blackish-brown (Fig. 16g, h View Figure 16 ); legs largely yellow, claws, hind tibia apically and hind tarsus dark brown (Fig. 16f View Figure 16 ); second to seventh metasomal tergites laterally yellow (Fig. 16e View Figure 16 ); wing membrane pale yellow, pterostigma dark brown and veins yellowish-brown to dark brown (Fig. 16a, b View Figure 16 ).

Biology.

Unknown.

Distribution.

China (Jilin).

Etymology.

Named after the compressed mesosoma: “coarctatus” is Latin for “compressed”.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Braconidae

Genus

Bracon