Rhogasella maculata Long & van Achterberg, 2025

Oanh, Nguyen Thi, Long, Khuat Dang, Achterberg, Cornelis van & Dao, Nguyen Cam, 2025, Rhogasella Baker, 1917 and Rogasodes Chen & He, 1997 (Hymenoptera: Braconidae: Rogadinae) new for Vietnam, with descriptions of three new species, Zootaxa 5659 (2), pp. 210-222 : 215-218

Rhogasella maculata Long & van Achterberg , sp. nov.

Figures 3 , 4

Type material. Holotype, ♀, labelled “Rog. 058” (DThU). NE Vietnam: Ha Giang, Vi Xuyen, Tay Con Linh Mts. , forest, 22°45′42″N 104°50’23″E, 1139m, 16.ix.2000, sweep [net], KD Long.

Description. Holotype, female, body length 5.6 mm, fore wing length 5.5 mm ( Fig. 3 ).

Head. Antenna with 38 flagellomeres; middle flagellomeres 2.3 × longer than wide; first flagellomere 1.2 × longer than second; head in frontal view strongly narrowed bellow ( Fig. 4B ); width of face equal to length of face and clypeus combined; malar space as long as basal mandible width; mandible width 0.6 × as wide as hypoclypeal depression ( Fig. 4B ); distance between tentorial pits 2.5 × distance between pits and eyes; in dorsal view head 1.6 × as wide as long medially; and height of eye 4.0 × as long as temple; in lateral view eye 1.4 × as long as wide; width of eye 3.0 × as long as temple; ocelli medium-sized, POL: OD: OOL = 3: 5: 5 ( Fig. 4A ); distance between front and hind ocelli 0.8 × as long as OOL; face with narrow longitudinal smooth strip between antennal sockets extending to middle of face ( Fig. 4B ), largely rugose-punctate medially, less rugose-punctate laterally; frons flat, with transverse rugae ( Fig. 4A ); vertex and temple smooth.

Mesosoma. Length of mesosoma 1.5 × as long as high ( Fig. 4E ); mesoscutum coriaceous, with fine punctures; notauli narrow, nearly smooth anteriorly, fused into sparsely striate area posteriorly ( Fig. 4D ); scutellar sulcus rather shallow, 0.5 × as long as scutellum; scutellum smooth medially, rugose-punctate apically; pronotal side sparsely crenulate medially, smooth dorsally and ventrally, precoxal sulcus rather wide, mostly crenulate; mesopleuron smooth with sparse punctures medially and ventrally; metapleuron coriaceous anteriorly and largely rugose posteriorly; propodeum without basal carina, largely areolate-rugulose ( Fig. 4F ).

Wings. Fore wing: pterostigma 3.7 × as long as wide; r: 2-SR: 3-SR: SR1=7: 15: 23: 37; vein r emitted behind middle of pterostigma ( Fig. 4I ); vein 1-CU1 as long as vein cu-a; vein cu-a oblique, slightly curved; 1-CU1: cu-a: 2-CU1: 3-CU1= 5: 5: 20: 4 ( Fig. 4I ); second submarginal cell of fore wing parallel-sided, basal length of second submarginal 3.1 × its width medially ( Fig. 4I ). Hind wing: vein M+CU: 1-M: 1r-m: 2-SC+R = 18: 18: 9: 3:10 ( Fig. 4J ).

Legs. Hind femur: tibia: basitarsus = 27: 34: 16; length of hind femur, tibia and basitarsus 5.4, 11.3, and 8.0 × as long as their maximum width, respectively; hind basitarsus: tibia: second˗fifth tarsal tarsomeres combined = 16: 34: 22; inner hind tibial spur 0.25 × as long as hind basitarsus.

Metasoma. First tergite 1.2 × as long as its apical width ( Fig. 4H ); second tergite 1.7 × longer than third tergite medially; ovipositor sheath 0.4 × as long as hind basitarsus; first–second metasomal tergites with prominent median carinae, largely striate-rugose; second tergite striate-rugose in lesser degree than first tergite; fourth–sixth tergites sparsely striate-rugose ( Fig. 4G ).

Colour. Head yellow, with wide upside down trapezium dark brown ( Fig. 4B ); frons anteriorly and stemmaticum brown; scapus brown; flagellum yellow, darker at extreme apex; palpi and mandible pale yellow; pronotal side yellow, pale brown medially; propleuron dark brown; mesopleuron largely blackish brown anteriorly and ventrally, yellow medio-posteriorly ( Fig. 4E ); metapleuron yellow anteriorly, brown posteriorly; mesonotum yellow ( Fig. 4D ); metanotum and propodeum dark brown to black; fore and middle legs yellow, except telotarsus brownish yellow; hind leg yellow, except coxa ventrally and apically, apical half of femur dark brown; telotarsus brownish yellow; fore wing veins yellow, pterostigma brownish yellow, wing membrane hyaline ( Fig. 4I ); metasoma dark brown; ovipositor sheath yellow, darker apically; ovipositor yellow.

Male. Unknown.

Etymology. From “macula” (Latin for spot, stain, mark), because of the scattered dark brown spots on its body.

Host. Unknown.

Distribution. Northeastern Vietnam: Ha Giang province.

Figures

FIGURE 3. Habitus of Rhogasella maculata Long & van Achterberg, sp. nov., holotype, female, lateral, scale bar in mm.

FIGURE 4. Diagnostic characters of Rhogasella maculata Long & vanAchterberg, sp. nov., holotype, female; A, Head, dorsal; B Head, frontal; C Head, lateral; D Mesonotum; E Mesopleuron; F Propodeum; G Second–sixth metasomal tergites, arrows indicate longitudinal rugosities and a minute basal triangular area; H First metasomal tergite; I Fore wing; J Hind wing, scale bar in mm.