Bracon (Lucobracon) quadratus, 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/83DBF977-9611-421D-8F07-F88703283283

taxon LSID

lsid:zoobank.org:act:83DBF977-9611-421D-8F07-F88703283283

treatment provided by

Deutsche Entomologische Zeitschrift by Pensoft

scientific name

Bracon (Lucobracon) quadratus
status

sp. nov.

Bracon (Lucobracon) quadratus sp. nov. Figs 21 View Figure 21 , 22 View Figure 22

Type material.

Holotype. ♀, China, Liaoning Prov., Dalian, 4.IX.1991, Lou Juxian, No. 975849 ( ZJUH). Paratypes. 2♀♀, same data as holotype, No. 975951, 975890 ( ZJUH).

Diagnosis.

This new species is very similar to B. (L.) grandiceps Thomson, 1892, but can be separated from the latter by the following characters: fore wing vein 1-SR+M 1.5 × longer than vein 1-M (1.8 × in B. (L.) grandiceps ); hind femur 3.4 × longer than maximum width (2.5 times); propodeum smooth along medio-longitudinal carina (rugose along medio-longitudinal carina); tergites yellow with third to sixth tergites with a brown medial spot, respectively (uniformly dark brown).

Description.

Holotype, ♀, length of body 3.3 mm, of fore wing 2.6 mm, of ovipositor sheath 1.5 mm.

Head. Antenna short, approximately as long as head and mesosoma, with 26 segments; apical antennal segment slightly acute, 2.1 × longer than its maximum width (Fig. 22k View Figure 22 ); first flagellomere 1.4 × longer than wide, 1.2 and 1.3 × longer than second and third, respectively, the latter being 1.1 × longer than wide; malar suture rather weak, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 2: 12: 5; clypeus sparsely short setose; eye not emarginate (Fig. 22g View Figure 22 ); face smooth, with some long setae laterally (Fig. 22g View Figure 22 ); eye height: shortest distance between eyes: head width = 11: 16: 28; frons smooth, nearly not concave behind antennal sockets, with a weak median groove (Fig. 22h View Figure 22 ); 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: 7; temples subparallel behind eyes (Fig. 22h View Figure 22 ).

Mesosoma. Length of mesosoma 1.8 × its height (Fig. 22c View Figure 22 ); notauli only impressed anteriorly (Fig. 22d View Figure 22 ); mesoscutum smooth, with sparse short setae along imaginary notaulic courses (Fig. 22d View Figure 22 ); scutellar sulcus deep, moderately wide, with crenulae (Fig. 22d View Figure 22 ); scutellum smooth, with dense short setae posteriorly; metanotum moderately convex medially (Fig. 22d View Figure 22 ); propodeum largely smooth, except for a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 22d View Figure 22 ).

Wings. Fore wing (Fig. 22a View Figure 22 ): SR1 not reaching tip of wing; SR1: 3-SR: r = 27: 16: 6; 1-SR+M more or less straight, 1.5 × longer than 1-M; 2-SR: 3-SR: r-m = 3: 4: 2; m-cu straight, 1.6 × longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a more or less interstitial. Hind wing (Fig. 22b View Figure 22 ): SC+R1: 2-SC+R: 1r-m = 14: 4: 5.

Legs. Length of fore femur: tibia: tarsus = 16: 20: 23; length of hind femur: tibia: basitarsus = 22: 32: 11; length of femur, tibia and basitarsus of hind leg 3.4, 8.0 and 5.5 × their maximum width, respectively; hind tibial spurs 0.4 and 0.5 × 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 rugose but posteriorly smooth (Fig. 22i View Figure 22 ); lateral grooves of first tergite moderately wide, with sparse weak crenulae (Fig. 22i View Figure 22 ); second tergite largely smooth but medio-basally weakly rugose (Fig. 22e View Figure 22 ); median length of second and third tergites approximately equal; second metasomal suture narrow, largely smooth but with a few weak crenulae, more or less straight medially (Fig. 22e View Figure 22 ); third to seventh tergites smooth (Fig. 22e View Figure 22 ); setose part of ovipositor sheath 0.6 × as long as fore wing.

Colour. Largely yellow (Fig. 21 View Figure 21 ); antennal segments apical half brown, scapus and pedicel yellowish-brown (Figs 21 View Figure 21 , 22j, k View Figure 22 ); eye, mandible apically, scutellum posteriorly, metanotum medially, claws and ovipositor sheath blackish-brown (Figs 21 View Figure 21 , 22d, f View Figure 22 ); third to sixth metasomal tergites each with a brown spot medially (Fig. 22e View Figure 22 ); wing membrane pale infuscate, pterostigma dark brown and veins yellowish-brown to dark brown (Fig. 22a, b View Figure 22 ).

Variation. Length of body of female 3.3-4.1 mm, of fore wing of female 2.3-3.1 mm and of ovipositor sheath 1.4-1.6 mm; length of mesosoma 1.7-1.8 × its height; antenna uniformly blackish-brown; setose part of ovipositor sheath 0.5-0.6 × as long as fore wing.

Biology.

Unknown.

Distribution.

China (Liaoning).

Etymology.

Named after the square brown and medial spot of fourth and fifth metasomal tergites: “quadratus” is Latin for “square”.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Braconidae

Genus

Bracon