Megalommum hoabinhense Long, 2022

Dzuong, Nguyen Van, Long, Khuat Dang, Mai, Pham Quynh, Hoa, Dang Thi, Oanh, Nguyen Thi & Nghiep, Hoang Thi, 2022, Four new species of the subfamily Braconinae (Hymenoptera: Braconidae) from Vietnam, Zootaxa 5116 (4), pp. 563-578 : 565-568

Megalommum hoabinhense Long , sp. nov.

Figs 1–11

Diagnosis. In dorsal view, head 1.6 × as wide as long; eye length 4.9 × temple; and eye length 1.7 × its width; ocelli in high triangle, POL: OD: OOL= 3: 5: 4 ( Fig. 3 ); vein 1-M of fore wing thin, 0.9 × vein 1-CU1 ( Fig. 5 ); vein m-cu slightly curved inwards, and 1.2 × vein 1-M; basal length of second submarginal cell 4.3 × apical width; in lateral view, mesosoma 1.9 × its height; hind femur robust, 3.2 × its maximum width ( Fig. 9 ); mesoscutum flat posteriorly, with sparse fine punctures ( Fig. 7 ); first metasomal tergite length 1.5 × its apical width, with median area striate-rugulose in most part, coriaceous apically; second tergite finely sculptured; midbasal triangular area of second tergite smooth, with punctate convergent grooves ( Fig. 8 ); second metasomal suture crenulate medially; third tergite sculptured laterally, smooth medially; ovipositor straight ( Fig. 10 ); ovipositor sheath obliquely setose, 0.2 × as long as fore wing.

Material examined. Holotype, ♀, “Bracn. 094 ” ( IEBR), NW Vietnam: Hoa Binh, Bao Hieu , litchi+sugarcane orchard, MT, 20°23’N 105°34’E, 80 m, 01–10.viii.2003, KD Long.

Description. Holotype, female, length of body 7.0 mm, fore wing 8.1 mm, antenna 8.4 mm, ovipositor sheath 1.9 mm ( Fig. 1 ).

Head. Antenna with 62 flagellomeres, slightly longer fore wing; apical antennomere with distinct spine; in lateral view, scapus 1.6 × as long as wide; length of first flagellomere 1.1 × second; first, second and penultimate flagellomeres 1.3, 1.2 and 1.7 × their maximum width,; maxillary palp as long as height of head; head 1.3 and 1.6 × as wide as long in anterior (frontal) and dorsal view respectively; face narrowed medially, rugose, 0.6 × as wide as long (15: 24) ( Fig. 2 ); in frontal view, eye length 2.2 × as long as its transverse width (38: 17); clypeus separated from face with a transverse carina; height of clypeus: inter tentorial distance: tentorial ocular distance = 5: 9: 3; distance between tentorial pits 3.0 × as long as distance from tentorial pit to eye margin ( Fig. 2 ); malar space 0.5 × basal width of mandible; in lateral view, transverse width of eye 3.3 × as long as temple (30: 9) ( Fig. 4 ); in dorsal view, length of eye 4.9 × temple (34: 7); eye height 1.7 × its width; ocelli in high triangle, distance between anterior and posterior ocelli as long as OOL; POL: OD: OOL= 3: 5: 4 ( Fig. 3 ); vertex smooth, sparsely punctate, sparsely setose, not emarginated beyond antennal sockets; frons smooth, distinctly depressed laterally, with fine median carina ( Fig. 3 ).

Mesosoma. Mesosoma 1.9 × its height (62: 33); pronotum smooth laterally, setose; mesoscutum flat posteriorly, sparsely setose, with sparse fine punctures medially, almost smooth anteriorly and laterally ( Fig. 7 ); notauli shallow, smooth; scutellar sulcus narrow and shallow, crenulate; scutellum smooth, sparsely setose; mesopleuron and metapleuron smooth, setose; medial area of metanotum without midlongitudinal carina anteriorly; propodeum smooth, setose.

Wings. Fore wing ( Fig. 5 ): length of pterostigma 5.0 × its width; vein 1-SR+M curved subbasally; vein 1-M thin, 0.9 × vein 1-CU1 (17: 18); vein 1-CU1 very thick, 3.0 × as thick as vein 1-M; vein 2-M curved basally; m-cu slightly curved inwards, and 1.2 × vein 1-M ( Fig. 5 ); subdiscal cell distinctly broader than discal cell, with median setose area and narrow glabrous sclerome, and upper and posterior parts of this area glabrous; veins SR1 curved subbasally; ratio of length of veins r: 3-RS: SR1 = 16: 41: 81; 2-RS: 3-RS: r-m = 24: 41: 15; second submarginal cell slightly narrowed apically, basal length of second submarginal cell 4.3 × its apical width; vein CU1b triangular, strongly widened basally ( Fig. 5 ); subdiscal (brachial) cell with median area setose, surround this area glabrous. Hind wing ( Fig. 6 ): vein SR slightly curved subbasally, parallel-sided apically; subbasal cell setose; vein 1r-m almost straight; vein 2-SC+R vertical ( Fig. 6 ); vein 1-M widely curved basally ( Fig. 6 ); M+CU: 1-M: 1r-m = 13: 83: 26; apex of vein SC+R1 with three curved hamuli.

Legs. Fore tibia 0.75 × fore tarsus (43: 57); ratio of lengths of fore femur: tibia: basitarsus: hind tarsus = 29: 43: 20: 57; hind femur robust, 3.2 × its maximum width ( Fig. 9 ); femur, tibia, basitarsus 3.2, 10.9 and 6.0 × their maximum width; outer and inner hind tibial spurs 0.35 × and 0.4 × as long as hind basitarsus; respectively; tarsal claw simple and with bristly ventrally.

Metasoma. First metasomal tergite 1.5 × as long as wide apically (41: 28), distinctly rugose with a midlongitudinal carina and a pair of narrow lateral smooth grooves; median area striate-rugulose in most part, coriaceous apically ( Fig. 11 ); second metasomal tergite 1.2 × as long as third tergite medially (25: 21), 1.4 × as wide (basally) as long (35: 25), length of midbasal triangular of second tergite in basal 0.8 of tergite (19: 25) ( Fig. 8 ); lateral sides of midbasal triangular area surrounded by shallow convergent punctate grooves; antero-lateral depression wide, coriaceous ( Fig. 8 ); second metasomal suture narrow, crenulate; third-fifth metasomal tergites coriaceous; ovipositor straight, needle-shaped apically, without dorsal notch or nodus and ventral serrations ( Fig. 10 ); ovipositor sheath covered with dense oblique setae, 0.2 × as long as fore wing.

Colour. Body yellow ( Fig. 1 ); eyes black or dark brown; scapus and pedicellus yellow; flagellum dark brown in more than basal half, brownish yellow apically; pterostigma yellow with black spot apically; vein and membrane of fore wing yellow, except parastigma black and dark brown area between parastigma and base of vein 1-SR+M; all legs yellow; ovipositor sheath brown; ovipositor yellow.

Distribution. NW Vietnam (Hoa Binh).

Biology. Unknown.

Etymology. The new species is named after the province (Hoa Binh), where the holotype was discovered.

Figures

FIGURE 1. Habitus of Megalommum hoabinhense Long, sp. nov., holotype, female (lateral).

FIGURES 2–11. Megalommum hoabinhense Long, sp. nov., holotype, female. 2 Head, frontal view 3 Head, dorsal view 4 Head, lateral view 5 Fore wing 6 Hind wing 7 Mesonotum 8 Metasoma 9 Hind femur 10 Ovipositor 11 First metasomal tergite.