Bracon (Lucobracon) quadratus, Li & He & Chen, 2020
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publication ID |
https://dx.doi.org/10.3897/dez.67.57668 |
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publication LSID |
lsid:zoobank.org:pub:41F77B2A-0E1C-4874-AE89-1E72B3DD6A32 |
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persistent identifier |
https://treatment.plazi.org/id/83DBF977-9611-421D-8F07-F88703283283 |
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taxon LSID |
lsid:zoobank.org:act:83DBF977-9611-421D-8F07-F88703283283 |
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treatment provided by |
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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”.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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