Trispinaria seminigra Long, 2020

Oanh, Nguyen Thi, Long, Khuat Dang, Mai, Pham Quynh & Dzuong, Nguyen Van, 2020, First record of the genus Trispinaria Quicke, 1986 (Hymenoptera, Braconidae, Braconinae) in Vietnam, with descriptions of two new species, ZooKeys 996, pp. 107-119 : 107

Trispinaria seminigra Long sp. nov. Figs 1 , 2-12

Material.

Holotype, ♀, “Bracn.1503” (IEBR), NE Vietnam: Tuyen Quang, Na Hang NP, Son Phu, forest, MT, 22°17'34"N, 105°28'19"E, 561 m, 15.iv.2018, KD Long. Paratypes, 3 ♀, "Bracn. 768 " (IEBR), N Vietnam: Ninh Binh, Cuc Phuong NP, forest, 20°19'N, 105°35'E, 180 m, sweeping, 9.v.2002, KD Long, “Bracn.1411” (VNMN), NE Vietnam: Tuyen Quang, Na Hang, Thanh Tuong, forest, MT, 22°19'01"N, 105°24'02"E, 162 m, 5.xi.2016, KD Long; "Bracn. 710 " (AMNH), NC Vietnam: Ha Tinh, Huong Son, forest, 18°13'N, 105°24'E, 900 m, 20-28.iv.1998, AMNH, K. Long.

Description.

Holotype, female, body length 6.2 mm, fore wing length 5.7 mm, antenna 7.3 mm, ovipositor sheath 1.5 mm (Fig. 1 ).

Head. Antenna with 58 antennomeres; length of third and fourth antennomere 1.75 (7: 4) and 1.5 × their width (6: 4); length of subapical antennomere 1.3 × its width (4: 3); in frontal view, width of face 1.9 × its length (25: 13) (Fig. 2 ); length of maxillary palp 0.7 × height of head (25: 37); face flattened, transversely rugose, triangular area upper clypeus smooth (Fig. 2 ); malar space as long as basal width of mandible (8: 8); clypeus convex medially, depressed laterally, its apical margin concave and with distinct carina (Fig. 2 ); distance between tentorial pits 1.7 × distance from pit to eye margin (10: 6); in lateral view, eye 3.0 × temple (18: 6); in dorsal view, head 1.7 × as wide as long (49: 29); in dorsal view, width of head 1.7 × median length (49: 29); eye 3.0 × as long as temple (21: 7); POL: OD: OOL = 3: 5: 10; eye 3.0 × temple (21: 7); frons flat, smooth, with fine median groove (Fig. 3 ).

Mesosoma. Length of mesosoma 1.65 × its height (78: 47); propleuron shallow, finely crenulate medially (Fig. 5 ); middle lobe of mesoscutum without impressions anteriorly; notauli deeper anteriorly, wider and flat posteriorly, almost smooth with faint median carina (Fig. 6 ); median lobe of mesoscutum without groove; mesoscutal lobes shiny, sparsely finely punctate; prescutellar sulcus narrow, crenulate; scutellum sparsely punctate; mesopleuron largely smooth, with large sparse punctures dorsally (Fig. 5 ); metapleuron punctate; propodeum with distinct V-shaped carina posteriorly (Fig. 4 ); median depression sparsely crenulate anteriorly, almost sooth posteriorly; lateral areola-like areas almost coriaceous.

Wings. Length of fore wing 3.2 × its maximum width (240: 75); length of pterostigma 3.8 × its width (42: 11); fore wing vein SR1 4.8 × as long as vein 3-SR (67: 14); r: 3-SR: SR1 = 13: 14: 67; cu-a interstitial, weakly inclivous (Fig. 11 ), cu-a: 2-CU1 = 7: 26; 2-SR: 3-SR: r-m = 15: 14: 11; second submarginal cell of fore wing less robust (Fig. 11 ); hind wing vein 1-M weakly curved basally (Fig. 12 ); vein 1r-m of hind wing largely united with 1-SC+R. Legs. Hind coxa sparsely setose; length of femur, tibia and basitarsus of hind leg 4.9 ×, 10.6 × and 8.0 × their width, respectively; length of hind inner and outer tibial spurs 0.5 × and 0.4 × hind basitarsus (16: 32)(13: 32), respectively; length of hind basitarsus 0.4 × hind tibia (32: 74) and 0.7 × second-fifth tarsus (32: 44); hind tarsal claw with large lobe.

Metasoma. Length of first tergite 0.9 × its apical width (27: 30), with basal excavation narrow and deep (Fig. 10 ); antero-lateral groove shallow, sparsely crenulate; median length of second tergite 0.9 × third tergite (25: 27; first metasomal tergite posteriorly, second-sixth metasomal tergites entirely coarsely reticulate (Fig. 9 ); tooth of sixth tergite developed (Fig. 7 ); latero-apical groove narrow, crenulate (Fig. 7 ); length of ovipositor sheath 0.26 × fore wing (15: 57); ovipositor with dorsal nodus; subapical ventral margin of ovipositor underneath nodus with serrations, but apico-ventrally without serrations (Fig. 8 ).

Colour. Head yellow; mesosoma and metasoma pale yellow; scapus brown; twenty middle antennomeres yellow; palpi and stemmaticum brownish yellow; mesoscutal lobes black, except median lobe laterally and posteriorly, lateral lobes anteriorly pale yellow; mesopleuron yellow ventrally, black dorsally; metapleuron black; scutellum pale yellow; metanotum and propodeum black; fore legs pale yellow; middle coxa, trochanter and trochantellus brown; middle femur brown, except outer side yellow; middle tibia and tarsus yellowish brown; hind legs black; hind tibial spurs pale yellow; pterostigma and veins brown; wing membrane subhyaline basally and medially, except fore wing membrane yellowish brown apically; first and second metasomal tergites black medio-basally, pale yellow laterally and apically; third-fifth metasomal tergites black basally, pale yellow apically; sixth metasomal tergite black, yellow apically; ovipositor sheath brown; ovipositor brownish yellow.

Variations.

Length of body 5.8-7.7 mm, of fore wing 5.3-6.7 mm; antenna with 57-65 antennomeres; 16-26 middle antennomeres yellow or antenna brown entirely; stemmaticum brownish yellow; vein SR1 of fore wing 4.0-4.9 × vein 3-SR; length of ovipositor sheath 0.22-0.25 × fore wing; middle coxa and tarsus brownish yellow; middle femur and tibia yellow; ovipositor yellow.

Male. Unknown.

Biology.

Unknown.

Etymology.

From semi (Latin for half) and niger (Latin for black), because the mesopleuron is black dorsally in contrast to the yellow ventral half.

Distribution.

N Vietnam: Tuyen Quang, Ninh Binh; NC Vietnam: Ha Tinh.

Notes.

Trispinaria seminigra sp. nov. differs from T. vietnamica sp. nov. by having: median length of first metasomal tergite 0.9 × as long as its apical width; propleuron shallow, finely rugose; fore wing vein cu-a slightly postfurcal and distinctly inclivous; hind wing vein 1-M almost straight basally; middle coxa dark brown; mesopleuron black dorsally; ovipositor apico-ventrally without serrations, except pre-apical ventral margin underneath with serrations.

The new species, T. seminigra sp. nov., is close to T. sannio (Enderlein), from Indonesia and Singapore by sharing the following characters: vein 1r-m of hind wing nearly united with vein 1-SC+R; apical half of subbasal cell of fore wing largely glabrous; and frons smooth. The new species can be inserted into the key by van Achterberg (1991) as follows:

Figures

Figure 1. Trispinaria seminigra Long, sp. nov., holotype, female, habitus, lateral view.

Figures 2 - 12. Trispinaria seminigra Long, sp. nov., holotype, female. 2 head, frontal view 3 head, dorsal view 4 propodeum 5 mesopleuron 6 mesonotum 7 fifth and sixth metasomal tergites, lateral view 8 apex of ovipositor 9 metasoma 10 first and second metasomal tergites, lateral view 11 fore wing 12 hind wing.