Leiobracon vietnamicus Long & van Achterberg, 2024

Dzuong, Nguyen Van, Long, Khuat Dang, Achterberg, Cornelis Van & Hiep, Nguyen Duc, 2024, Leiobracon, a new genus of the subfamily Braconinae (Hymenoptera, Braconidae) from Vietnam, Zootaxa 5453 (3), pp. 387-394 : 389-392

publication ID	https://doi.org/ 10.11646/zootaxa.5453.3.6
publication LSID	lsid:zoobank.org:pub:2BF085D9-1748-4507-AC10-65CD1FB6000E
persistent identifier	https://treatment.plazi.org/id/039B4457-851D-2654-36B1-FD2D6E9D6A99
treatment provided by	Plazi
scientific name	Leiobracon vietnamicus Long & van Achterberg
status	sp. nov.

Treatment

Leiobracon vietnamicus Long & van Achterberg , sp. nov.

Type material. Holotype, ♀, “Bracn. 1018 ” ( IEBR), NW Vietnam: Ha Tinh, Huong Son , Vu Quang NP, forest, sweep [net], 23.ix.2009, KD Long . Paratypes, 2♀, “Bracn. 068 ” ( IEBR), NE Vietnam: Vinh Phuc, Tam Dao NP, forest, 900m, sweep [net], 04.vii.2003, NTP LIEN ; “Bracn. 1255 ” ( IEBR), NE Vietnam: Cao Bang, Tinh Tuc, Phia OacPhia Den NP, forest, MT , 8–18.v.2013, PT NHI .

Description. Holotype, female, body 8.6 mm, fore wing 9.0 mm, ovipositor sheath 2.3 mm.

Head. Antenna incomplete, with 57 antennomeres remaining, [in paratype apical flagellomere with spine and 1.75 × longer than its maximum width (without spine) Figs 3A, B View FIGURE 3 ]; scape nearly globose, in lateral aspect longer dorsally than ventrally ( Fig. 2C View FIGURE 2 ); length of scape 1.2 × longer than width apically; flagellomeres short, nearly quadrate; first flagellomere 1.1 × longer than second; first and second flagellomeres 1.1 and 1.0 × longer than wide, respectively; length of maxillary palp 0.7 × as long as height of head; clypeus height: inter-tentorial distance: tentorio-ocular distance = 9: 17: 6; clypeus separated from face by a fine carina ( Fig. 2B View FIGURE 2 ); face coriaceous and with fine punctures, in lateral view densely setose ( Fig. 2C View FIGURE 2 ); eye height: shortest distance between eyes: head width = 33: 26: 57; face 1.2 × wider than long; width of hypoclypeal depression 1.3 × longer than distance from it to eye margin; malar suture absent, malar space 0.7 × basal width of mandible; frons flat and smooth ( Fig. 2A View FIGURE 2 ); vertex smooth, with rather short setae; OOL: OD: POL = 14: 5: 6; temples roundly narrowed behind eyes and eye 1.85 × as long as temple ( Fig. 2A View FIGURE 2 ); in lateral view transverse width of eye 1.9 × as long as temple.

Mesosoma. Length of mesosoma 1.8 × its height; pronotum smooth, densely setose; mesopleuron slightly convex and smooth ( Fig. 1A View FIGURE 1 ); metapleuron flat and smooth, fused with propodeum dorsally (without suture between metapleuron and propodeum); notauli absent ( Fig. 2D View FIGURE 2 ); mesoscutum smooth, scutellar sulcus shallow, narrow and smooth ( Fig. 2D View FIGURE 2 ); scutellum slightly convex and smooth; propodeum smooth; propodeal spiracle small, situated behind far from middle of propodeum; mesonotum and propodeum sparsely setose.

Wings. Fore wing with pterostigma 3.5 × as long as its maximum width; angle between 1-SR and C+SC+ R about 75° ( Fig. 2H View FIGURE 2 ); r: 3-SR: 2-SR: SR1= 15: 28: 22: 42; strongly bent posteriorly after arising from vein 1-SR ( Fig. 2H View FIGURE 2 ); vein r nearly as long as vein 2-SR; vein 1-M 1.7 × longer than m-cu; vein 1-CU1 short and thick, nearly quadrate; vein cu-a distinctly reclivous, slightly postfurcal ( Fig 2H View FIGURE 2 ). Hind wing with vein 2-SC+ R vertical; vein cu-a reclivous ( Fig. 2I View FIGURE 2 ), SC+ R 1: 1r-m = 15: 27.

Legs. Length of fore femur: tibia: tarsus = 20: 23: 28; length of hind femur, tibia and basitarsus, 3.55, 5.75 and 4.0 × longer than their maximum width, respectively; hind basitarsus 0.4 × as long as hind tibia and 0.7 × second-fifth tarsal segments combined; inner and outer hind tibial spurs 0.40 and 0.35 × as long as hind basitarsus, respectively, inner side of hind tarsal claw with a separate tooth ( Fig. 2E View FIGURE 2 ).

Metasoma. Metasoma 1.1 × as long as mesosoma and head combined; first tergite 2.9 × its apical width, surface smooth; lateral grooves of first tergite smooth ( Fig. 2F View FIGURE 2 ); second suture indistinct; second–sixth tergites smooth; setose part of ovipositor sheath 0.25 × as long as fore wing; hypopygium medium-sized, sclerotized throughout, apically acute, and sparsely setose ( Fig. 1C View FIGURE 1 ); ovipositor sheath densely setose, subequal to hind tibia; ovipositor with pre-apical dorsal nodus and apico-ventral serrations ( Fig. 2G View FIGURE 2 ).

In addition, the type species of Pseudoshirakia van Achterberg and Pseudospinaria Enderlein were previously reported from Vietnam.

Colour. Reddish yellow; scape and pedicel yellow, contrasting with brown flagellum; fore and middle legs yellow; hind leg yellowish brown to dark brown; spurs yellow; wings yellow, parastigma dark brown, large dark brown spot of fore wing extending to middle of vein 1-SR+M ( Fig. 2H View FIGURE 2 ); ovipositor sheath brownish black, ovipositor yellow.

Variation. Paratypes, females, body 8.6–9.0 mm, fore wing 9.8–10.5 mm, ovipositor sheath 2.5–2.6 mm, antennal segments 66.

Biology. Unknown.

Male. Unknown.

Distribution. Northeast Vietnam (Cao Bang and Vinh Phuc provinces) and North Central Vietnam (Ha Tinh province).