Streblocera (Streblocera) huuliena Long, 2025

Streblocera (Streblocera) huuliena Long & PQMai, sp. nov.

Figures 13 View FIGURE 13 , 14 View FIGURE 14 , 21 View FIGURE 21

Type material. Holotype, ♀, labelled “Euph. 393 ” ( IEBR), NE Vietnam: Lang Son, Huu Lung , Huu Lien NR, forest, MT, 21°38’43’’N 106°21’41’E, 187 m, 25.ii.2024, PQ Mai, TD Duong . Paratypes, 2♀, labelled “Euph. 398 ”, “Euph. 399 ”, ( IEBR), NE Vietnam: Lang Son, Huu Lien NR, forest, MT, 21°39’4’’N 106°21’51’E, 200 m, 15.ii.2024, PQ Mai, TD Duong; paratype , 1♀, labelled “Euph. 395 ” ( IEBR), ibid., but 25.iii.2024, PQ Mai, TD Duong .

Diagnosis. Small wasp, S. (S.) huuliena , sp. nov. is relatively close to S. (S.) curvata Belokobylskij , from Nepal but differs from the latter by having: 1) First metasomal tergite 1.6 × as long as its apical width [vs 2.0 × in S. (S.) curvata ] and apical width of first metasomal tergite 2.5 × as long as its minimum width [vs 3.0 × in S. (S.) curvata ]; 2) Vein r of fore wing arising from middle of pterostigma (vs far behind middle of pterostigma see Fig. 16 View FIGURE 16 in Belokobylskij 2000a) and vein 1-R1 very short, 0.3 × as long as pterostigma; and 3) Antenna with 14 antennomeres [vs 17–18 antennomeres in S. (S.) curvata ]. The new species, S. (S.) huuliena , sp. nov., is also similar to S. (S.) necurvata , sp. nov., differences between them were given in the key; antenna with 14 antennomeres.

Description. Holotype, ♀; body length 1.9 mm, fore wing length 1.8 mm, ovipositor 0.4 mm ( Fig. 13 View FIGURE 13 ).

Head. Antenna with 14 antennomeres; length of scapus 8.7 × its maximum width ( Fig. 14H View FIGURE 14 ), and 1.7 × of head height; first flagellomere curved, 6.7 × as long as its median width, and 2.5 × the second flagellomere; first flagellomere 0.4 × scapus; first flagellomere curved, with apical hook, and 2.6 × second flagellomere; second-seventh flagellomeres serrate ventrally; in dorsal view, occipital carina incomplete medio-dorsally ( Fig. 14A View FIGURE 14 ), width of head 1.5 × its median length, and 1.4 × width of mesoscutum (without tegulae); temple roundly narrowed behind eye; length of eye 2.4 × as long as temple; ocelli small, POL: OD: OOL= 3.5: 1.5: 5.0 ( Fig. 14A View FIGURE 14 ); eye 2.1 × as high as broad; in lateral view, transverse diameter of eye 1.4 × temple ( Fig. 14C View FIGURE 14 ); in frontal view, diameter of antennal socket as long as distance between sockets; face width 1.1 × length of face and clypeus combined, and 1.4 × height of eye; ventral margin of clypeus weakly curved medially; malar space 1.3 × as long as basal width of mandible, and 0.4 × as long as eye height; distance between tentorial pits 1.25 × distance from pit to eye margin; face and clypeus coriaceous ( Fig. 14B View FIGURE 14 ); frons slightly depressed laterally, smooth, with fine median striae; temple and vertex highly polished ( Figs 14A, C View FIGURE 14 ).

Mesosoma. In lateral view, length of mesosoma 1.6 × as long as its height; notauli narrow, punctate, convergent posteriorly ( Fig. 14D View FIGURE 14 ); prescutellar sulcus deep, 0.6 × as long as scutellum, with one carina ( Fig. 14D View FIGURE 14 ); lobes of mesoscutum and scutellum smooth; pronotal side smooth, sparsely crenulated anteriorly ( Fig. 14E View FIGURE 14 ); precoxal sulcus short, punctate; mesopleuron highly smooth; metapleuron sparsely rugose; propodeum without basal carina, smooth anterio-laterally, nearly areolate-rugose medio-posteriorly ( Fig. 14G View FIGURE 14 ).

Wings. Length of fore wing 2.75 × its width; pterostigma 2.9 × 1-R1; vein 1-R1 0.3 × pterostigma ( Fig. 14I View FIGURE 14 ); vein r arising near middle of pterostigma, 0.25 × as long as width of pterostigma, 0.2 × vein 2-SR, and 0.2 × vein 1-R1; vein 1-CU1 short, 1-CU1: cu-a: 2-CU1 = 1.5: 2.0: 6.0; hind wing: 1-M: 1r-m: 2-SC+R = 1.5: 2.0: 6.0.

Legs. Length of hind femur, tibia and basitarsus 5.1, 11.6 and 9.0 × as long as their maximum width, respectively; hind basitarsus 0.3 × hind tibia; and 0.6 × second-fifth tarsus combined; fourth hind tarsus 0.6 × as long as fifth tarsus (without pretarsus).

Metasoma. Length of first tergite 1.6 × its apical width, apical width of first tergite 2.5 × its minimum width ( Fig. 14F View FIGURE 14 ); first metasomal tergite smooth basally, with sparse striae medially, smooth on apical half ( Fig. 14F View FIGURE 14 ); the remainder highly smooth; ovipositor sheath and ovipositor tightly attached to metasoma ventrally.

Colour. Head yellow; eyes silver-grey; stemmaticum brown; antenna yellow, except from third antennomere to apical one brownish yellow; all legs yellow; mesopleuron and metanotum yellow; mesonotum and propodeum yellowish brown; metasoma yellow; wing veins pale yellow; wing membrane hyaline.

Male. Unknown.

Host: Unknown.

Etymology. Named after type locality, Huu Lien Nature Reserve in Lang Son province, Northern Vietnam.

Distribution. NE Vietnam: Lang Son province (Huu Lien NR) ( Fig. 21 View FIGURE 21 ).