Rasnitsynoryctes vietnamicus Long & Belokobylskij

Long, Khuat Dang & Belokobylskij, Sergey A., 2019, First record of the genus Rasnitsynoryctes Belokobylskij, 2011 (Hymenoptera, Braconidae, Doryctinae) in Vietnam, with the description of a new species, ZooKeys 854, pp. 17-24 : 17

Rasnitsynoryctes vietnamicus Long & Belokobylskij sp. nov. Figs 1, 2-16

Type material.

Holotype, female, "Doryc. 673", NE Vietnam: Bac Giang, Son Dong, Yen Tu NR, 300 m, 4.vii.2010 (PT Nhi leg.) (IEBR).

Comparative diagnosis.

The new species, Rasnitsynoryctes vietnamicus sp. nov., is very similar to the type species of the genus, R. alexandri Belokobylskij, 2011, from Malaysia; the differences between these species are showed in the key below after description.

Description.

Female. Body length 11.7 mm, fore wing length 8.6 mm, ovipositor sheath 12.0 mm (Fig. 1).

Head. Antennae with more than 48 segments (apical segments missing); scapus 1.4 times as long as its maximum width (14: 10); third segment almost as long as fourth segment (27: 26); middle segments 3.5-3.7 times as long as their width. Head width (dorsal view) 1.2 times its median length (64: 52), head roundly narrowed behind eyes (Fig. 2), length of eye 1.6 times as long as temple (44: 28); ocelli rather small, POL: OD: OOL = 7: 5: 8; in lateral view, eye 1.4 times as long as temple (25: 18) (Fig. 4); maxillary palp 1.8 times as long as height of head (103: 57); face width 1.4 times length of face and clypeus combined (35: 25) (Fig. 3); malar space 0.7 times basal width of mandible (11: 15); width of hypoclypeal depression equal to distance from edge of depression to eye (15: 15); distance between tentorial pits 1.45 times distance from pit to eye (16: 11); occipital carina not fused below with hypostomal carina above base of mandible but almost faded with patch of coarse rugosities near base of mandible.

Mesosoma. Length 2.3 times its height (77: 34); mesoscutum highly and perpendicularly elevated above pronotum; median lobe of mesoscutum with distinct median longitudinal depression (Fig. 5); notauli deep, crenulate anteriorly, widened posteriorly, coarsely rugose (Fig. 5); pronotal sides largely crenulate medially, granulate ventrally (Fig. 6); prescutellar depression with only median carina, 0.3 times as long as scutellum (6: 19); subalar depression wide and deep, with oblique rugosity; precoxal sulcus long, shallow, almost smooth (Fig. 6); metapleuron setose, coarsely rugose; propodeum with median carina in basal 0.3 of propodeum, without delineated areola (Fig. 7).

Wings. Length of fore wing 4.25 times as long as its maximum width (102: 24) (Fig. 8); vein 1-R1 (metacarp) 1.5 times as long as pterostigma (58: 38); length of pterostigma 4.75 times its width (38: 8); vein r (radial) omitting before middle of pterostigma, 0.6 times as long as vein 2-SR (first radiomedial) and 0.35 times as long as vein 3-SR (second radial abscissa); r: 2-SR: 3-SR: SR1 (third radial abscissa) = 9: 16: 26: 42; basal length of second submarginal (second radiomedial) cell 2.8 times its maximum width (36: 13), 1.1 times length of subdiscal (brachial) cell basally (36: 32); vein 1-CU1: cu-a (nervulus): 2-CU1 = 5: 6: 28; vein m-cu (recurrent) oblique. Length of hind wing 5.5 times as long as its maximum width (77: 14); vein M+CU (first mediocubital abscissa) short, 0.3 times as long as vein 1-M (second mediocubital abscissa) (Fig. 9); vein M+CU: 1-M: r-m (basal) = 16: 58: 30.

Legs. Inner side of fore tibia with row of short robust spines; middle basitarsus 15.0 times as long as its width (60: 4) and 0.9 times as long as tarsal segments 2-4 combined (60: 68); hind coxa 1.6 times as long as its maximum width (52: 35) (Fig. 11); hind femur, tibia and basitarsus 4.25, 14 and 12 times their maximum width, respectively (85: 20; 140: 14; 72: 6) (Figs 13, 14); hind basitarsus 0.5 times as long as hind tibia (72: 140); and 1.1 times as long as hind tarsal segments 2-5 combined (72: 68); second segment of hind tarsus 0.4 times as long as basitarsus (38: 72); fourth segment 0.5 times as long as fifth tarsal segment (without pretarsus) (7: 14).

Metasoma. Metasoma 1.4 times as long as head and mesosoma combined (69: 48); first metasomal tergite with large dorsope (Fig. 10); first tergite 2.3 times as long as its maximum width (86: 38) (Fig. 10), 2.5 times as long as propodeum (86: 35); second tergite with U-shaped medial area, emarginated by rather wide and crenulate lateral furrows fused with suture between second and third tergites (Fig. 12); medial length of second tergite 0.98 times its basal width (47: 48), 1.1 times medial length of third tergite (47: 43) (Fig. 12); ovipositor sheath slightly longer than body, and 1.4 times longer than fore wing (120: 86).

Sculpture and pubescence. Frons rugose; vertex finely transversely striate; temple finely rugose-punctate; face largely rugose; clypeus and malar space with dense long setae; malar space largely rugose-punctate contrasting to rather smooth area between hypostomal carina and malar space; notauli largely rugose (Fig. 5); median and lateral lobes of mesoscutum rugose-coriaceous; scutellum finely and densely punctate; pronotum granulate ventrally, rugose dorsally; mesopleuron coriaceous; subalar depression with oblique rugosities; metapleuron setose, largely rugose; propodeum foveolate-rugose (Fig. 7); hind coxa finely and densely punctate laterally, finely rugose-punctate dorsally; first metasomal tergite and medial area of second tergite foveolate-rugose; third tergite largely rugose in basal 0.7, smooth in apical 0.3; fourth tergite largely rugose basally and laterally, finely rugose medially and almost smooth with sparse punctures apically; fifth–sixth tergites finely rugose-punctate basally and laterally, almost smooth apically; ovipositor sheath covered with short dense setae.

Colour. Black body; antenna brown; head mainly dark brown, subalar space brownish yellow; palpi white; fore and middle legs yellow, except coxa, trochanters and trochantellus cream white; hind coxa and femur black, trochanters and trochantellus yellow, hind tibia (except yellow basal area) and tarsus infuscate; tegula yellow; fore wing subhyaline, its veins brown, outside area of vein r beneath pterostigma brownish; ovipositor sheath brown.

Male.

Unknown.

Etymology.

The new species is named after the country (Vietnam) where the holotype was collected.

Distribution.

North-eastern Vietnam (Bac Giang Province).