Brachyzapus carinatus, Pham & Broad & Matsumoto & Wägele, 2012

Pham, Nhi Thi, Broad, Gavin R., Matsumoto, Rikio & Wägele, Wolfgang J., 2012, First record of the genus Brachyzapus Gauld and Dubois (Hymenoptera: Ichneumonidae: Pimplinae) from Vietnam, with descriptions of six new species, Journal of Natural History 46 (27 - 28), pp. 1639-1661 : 1640-1643

Brachyzapus carinatus sp. nov.

( Figure 1 )

Material examined

Holotype (female). Lao Cai, Sa Pa , 1700 m above sea level (a.s.l.), 30 May 1997, hand net, R. Matsumoto leg. ( OMNH).

Diagnosis

Inner margins of eyes slightly convergent medially; malar space 0.65 × basal width of mandible; scutellum with lateral carina present basally, laterally with weak transverse ridges; mesopleuron with epicnemial carina strongly sinuous, mesopleural suture foveolate; propodeum with posterior transverse carina strong, basal and apical stubs of lateromedian longitudinal carina present; first sternite strongly convex, rounded apically.

Description

Body length 7 mm, fore wing 6.3 mm, ovipositor 1.75 mm.

Head. Antenna with more than 17 flagellomeres (apical flagellomeres missing), first flagellomere 1.3 × length of second; diameter of lateral ocellus 0.75 × ocellar– ocular distance; frons impunctate and polished; inner margins of eyes slightly convergent medially; face 1.6 × as high as wide, pubescent, upper margin broadly concave between antennal sockets; clypeus moderately convex, about 0.65 × as high as wide, apical margin thin, emarginate; malar space about 0.65 × basal width of mandible; mandible weakly twisted and narrow, upper tooth longer than lower tooth; occipital carina complete, meeting hypostomal carina about 1.2 × length of mandible basal width from base of mandible.

Mesosoma. Epomia length 2 × basal mandible width, extending from collar to dorsal margin of pronotum; pronotum impunctate and polished laterally, sparsely pubescent dorsally and at collar; mesoscutum moderately densely setose, with notauli deep, convergent at posterior 0.3 in shallow hollow; scutellum strongly convex, pubescent basally, laterally with weak transverse ridges, lateral carina present basally; mesopleuron subpolished, moderately dense hairs dorsally, ventrally scattered hairs, mesopleural suture foveolate, epicnemial carina present on lower 0.6, strongly sinuous; metapleuron convex, bare and polished, pubescent dorsally along pleural carina, submetapleural carina forming small lobe anteriorly, angled about 120 ◦ posteriorly; metasternum with some transverse ridges emerging from posterior angulation of submetapleural carina; propodeum moderately convex, pubescent laterally, dorsally mostly bare, petiolar area polished, lateromedian longitudinal carina with basal and posterior parts present, lateral longitudinal carina present on apical 0.5, posterior transverse carina strong. Legs with mid and hind tibiae slightly swollen sub-basally; fore femur 4.2 ×x as long as wide; hind femur 5 × longer than wide, length 0.83 × tibia, tibia 8.1 × as long as apical width; basitarsus longer than following three tarsomeres combined, 0.33 × length of tibia, 0.45 × tarsus, 2.3 × second tarsomere, fourth tarsomere very short, fifth 2 × as long as third. Fore wing with vein Rs&M opposite cu-a, 2 rs-m about 0.75 × distance between 2 rs-m and 2 m-cu, vein cu-a slightly inclivous, vein Cu 1 a separated from 1 m-cu by 1.2 × length of vein Cu 1 b; hind wing with first abscissa of vein Cu 1 about 1.15 × as long as vein cu-a.

Metasoma. Metasoma 1.6 × head and mesosoma combined; tergites with fine punctures, weakly coriaceous; first tergite 2.3 × as long as apical width, dorsolateral carina weakly complete, median longitudinal carina faint before transverse smooth band; second tergite 0.8 × length of first, 1.15 × as long as apical width, basal and apical oblique grooves moderately deep, rhombic area moderately convex; third tergite shorter than second, basal and apical oblique grooves weakly present; first sternite rounded, strongly convex apically; ovipositor straight, length of ovipositor from tip of hypopygium 0.75 × length of hind tibia, tapered to sharp point.

Colour. Black. Antenna yellowish brown, clypeus and mandible brown, palpi and tegula yellow; scutellum and post-scutellum reddish; legs yellowish brown, except hind tibia with sub-basal and apical parts slightly darker; wings yellowish, pterostigma and veins yellowish brown; ovipositor reddish.

Male. Unknown.

Distribution

Currently known only from Sa Pa, Lao Cai Province, Northern Vietnam ( Figure 7 ).

Ecological note

The single specimen was collected in montane evergreen forest at an elevation of 1700 m a.s.l.

Comparison

This new species differs from its congeners by the presence of basal and apical stubs of the lateromedian longitudinal carinae on the propodeum. In general appearance, this species resembles B. duboisi sp. nov. except for the presence of extra carinae on the propodeum and the strongly sinuous epicnemial carina ventrally.

Etymology

This species is named after the presence of basal and posterior stubs of the lateromedian longitudinal carinae on the propodeum.

Figures

Figure 1. Brachyzapus carinatus sp. nov. holotype female: (A) lateral view; (B) face; (C) dorsal view of head and mesoscutum; (D) dorsal view of scutellum, metascutellum and propodeum; (E) lateral view of mesosoma; (F) wings; (G) dorsal view of tergites 1–3; (H) ovipositor.

Figure 7. Map showing the type locality of six new species of Brachyzapus.