Neurogoniella crassinervis ( Nixon, 1950 ) Oanh & Long & Achterberg & Nghiep & Hiep, 2024

Oanh, Nguyen Thi, Long, Khuat Dang, Achterberg, Cornelis Van, Nghiep, Hoang Thi & Hiep, Nguyen Duc, 2024, A new genus and rare genera of Macrocentrinae from the Oriental region (Hymenoptera: Braconidae), Zootaxa 5551 (3), pp. 580-590 : 584-586

Neurogoniella crassinervis ( Nixon, 1950) comb. nov.

Figures 3 , 4

Macrocentrus crassinervis Nixon, 1950: 457 . Holotype in Natural History Museum, London and examined by CvA.

Material examined: 1 ♀, labelled “Macr. 080 ” ( IEBR), South Vietnam: Dong Nai, Vinh Cuu, Bu Dang , forest, light trap, 11.vi.2020, PT Nhi ; 1 ♂, labelled “Macr. 081” ( IEBR), South Vietnam: Dong Nai, Vinh Cuu, Phu Ly , forest, light trap, 07.vi.2020, PT Nhi ; 1 ♀ ( RMNH), CH Vietnam: Chu Yang Su N.P., at light, c. 500 m, 2.vi.2007, near river and edge of forest, E. Gasso Miracle & C. v. Achterberg .

Redescription. Female from Vietnam (“Macr. 080 ”, IEBR), body length 6.7 mm, fore wing length 6.3 mm, ovipositor 4.8 mm (setose part of sheath: 4.4 mm) ( Fig. 3 ).

Head. Antenna with 29 flagellomeres remaining (in holotype 46); length of first and second flagellomeres 4.0 and 3.0 × their width, respectively; length of subapical antennomere 2.5 × its width; in frontal view, width of face 1.3 × its length and 0.8 × eye height ( Fig. 4C ); length of maxillary palp 1.6 × height of head; face flattened, transversely rugose, triangular area upper clypeus smooth ( Fig. 4C ); malar space 0.9 × as long as basal width of mandible; clypeus convex medio-medially, depressed laterally, its apical margin concave and with distinct lamella ( Fig. 4C ); distance between tentorial pits 2.5 × distance from pit to eye margin; temple narrow, in lateral view eye 3.7 × temple; head transverse, 2.7 × as wide as long and eye 5.7 × as long as temple in dorsal view; ocelli large, POL: OD: OOL = 9: 7: 5 ( Fig. 4A ).

Mesosoma. Length of mesosoma 1.4. × its height; propleuron shallow, finely crenulate medially ( Fig. 4B ); middle lobe of mesoscutum without impressions anteriorly; notauli deeper anteriorly, wider and flat posteriorly, almost smooth with faint median carina; median lobe of mesoscutum without groove; mesoscutal lobes shiny, almost smooth; prescutellar sulcus narrow, crenulate; scutellum shiny, nearly smooth; mesopleuron with sparse fine punctures dorsally, with large and discrete punctures medially ( Fig. 4B ); metapleuron punctate; propodeum nearly coriaceous anteriorly, with distinct curved rugae posteriorly ( Figs 4E, F ).

Wings. Length of fore wing 3.1 × its maximum width; length of pterostigma 3.45 × its width; fore wing vein SR1 2.8 × as long as vein 3-SR; r: 3-SR: SR1 = 12: 17: 48; cu-a postfurcal, strongly swollen basally ( Fig. 4G ), cu-a: 2-CU1 = 10: 8; 2-SR: 3-SR: r-m = 12: 17: 7; second submarginal cell of fore wing less robust ( Fig. 4G ); hind wing vein 1-M weakly curved basally ( Fig. 4G ); vein SC+R1 abruptly bent basally; vein SR curved basally, that marginal cell strongly widened basally, narrowly medially and widened apically; vein 1-SC+R horizontal (longitudinal) ( Fig. 4I ).

Legs. Hind coxa shiny, smooth; length of femur, tibia and basitarsus of hind leg 7.5, 10.7 and 6.5 × their width, respectively; outer side of mid and hind trochantellus with cluster of 9–10 teeth apically ( Figs 4J, K ); length of hind inner and outer tibial spurs 0.7 and 0.6 × hind basitarsus, respectively; length of hind basitarsus 0.33 × hind tibia and 0.9 × second-fifth tarsus combined; tarsal claw with large lobe, with conspicuous pecten basally ( Fig. 4D ).

Metasoma. Length of first metasomal tergite widened from base to apex, with narrow and deep excavation basally, and 1.8 × its apical width, ( Fig. 4H ); antero-lateral groove shallow, sparsely crenulate; median length of second tergite 1.1 × third tergite ( Fig. 4H ); first metasomal tergite shiny, with sparse fine punctures and setae ( Fig. 4H ); second-sixth metasomal tergites entirely shiny, with sparse fine punctures and setae as in first tergite ( Fig. 4H ); ovipositor straight, length of ovipositor 0.8 × fore wing ( Fig. 3 ).

Colour. Body light yellow; scape and pedicel yellow, except scape brown apically; flagellum dark brown, yellow apically; stemmaticum, vertex and occiput black; all legs pale yellow, except hind tibia largely dark brown, yellow basally ( Fig. 3 ); wing veins brown, except vein 1-R1 yellow; parastigma yellow; pterostigma yellow basally, brown apically ( Fig. 4G ); ovipositor sheath and ovipositor brownish yellow.

Variations. Male, labelled “Macr. 081” (IEBR), body smaller, length of body 5.7 mm, of fore wing 5.4 mm; has 48 antennomeres and the same colour as female; the female from Chu Yang Su N.P. has 47 antennomeres and apical third of antenna yellowish brown; length of body 6.4 mm, of fore wing 6.1 mm; vein 2-SR+M of fore wing 0.6–0.9 × as long as vein 2-SR.

Biology. Parasitoid of Symitha nolalella Walker, 1866 ( Noctuidae ) on Lagerstroemia parviflora Roxburgh ( Nixon 1950).

Distribution. Oriental: India; Vietnam (new record).

Figures

FIGURE 3. Habitus of Neurogoniella crassinervis (Nixon), Vietnam, female, lateral, labelled “Macr.080” (IEBR).

FIGURE 4 A–K. Diagnostic characters of Neurogoniella crassinervis (Nixon), Vietnam, female, “Macr.080”(IEBR) A Head, dorsal B Mesopleuron C Head, frontal D Hind tarsal claw E Propodeum, dorsal F Propodeum, lateral G Fore wing H First– fourth metasomal tergites I Hind wing J Middle femur, outer side K Hind femur, outer side.