Brachyzapus hoanglienensis, 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 : 1652-1654

Brachyzapus hoanglienensis sp. nov.

( Figure 5 )

Material examined

Holotype (female). Lao Cai, Hoang Lien NP, 1550 m a.s.l., 22–29 October 1999, Malaise trap, C. v. Achterberg leg. ( RMNH).

Diagnosis

Inner margins of eyes slightly convergent medially; malar space 0.6 × basal width of mandible; scutellum with lateral carina present basally, laterally without transverse ridges; mesopleural suture smooth, not foveolate; legs slender, fore femur 5.8 × as long as width; propodeum with posterior transverse carina strong; first sternite with some oblique ridges basally, strongly convex, rounded apically; body reddish brown.

Description

Body length 7.3 mm, fore wing 6 mm, ovipositor 1.5 mm.

Head. Antenna with 26 flagellomeres, first flagellomere 1.45 × length of second; diameter of lateral ocellus as long as ocellar–ocular distance; frons impunctate, polished; inner margins of eyes slightly convergent medially; face 1.5 × as high as wide, pubescent, upper margin concave between antennal sockets; clypeus moderately convex, about 0.65 × as high as wide, apical margin thin, emarginate; malar space about 0.6 × basal width of mandible; mandible narrow, weakly twisted, upper tooth much longer than lower tooth; occipital carina complete, meeting hypostomal carina about 0.9 × length of mandible basal width from base of mandible.

Mesosoma. Epomia length 1.9 × mandible width, extending from collar nearly to dorsal margin of pronotum; pronotum polished, scattered hairs dorsally; mesoscutum convex, moderately densely setose, with notauli deep, convergent at posterior 0.3 in shallow hollow; scutellum strongly convex, pubescent basally, laterally without transverse ridges, lateral carina present basally; mesopleuron subpolished, pubescent dorsally and ventrally, mesopleural suture not foveolate, epicnemial carina present on lower 0.5; metapleuron convex, bare and polished, pubescent dorsally along pleural carina, submetapleural carina, forming small lobe anteriorly, angled about 120 ◦ posteriorly; metasternum with some short transverse ridges at level of posterior angulation; propodeum moderately convex, pubescent laterally, dorsally mostly bare and polished, lateral longitudinal carina present on apical 0.4, posterior transverse carina strong. Legs slender, mid and hind tibiae slightly swollen sub-basally; fore femur 5.8 × as long as wide; hind femur 6.15 × longer than wide, length 0.8 × tibia, tibia 10 × as long as apical width; basitarsus longer than following three tarsomeres combined, length 0.3 × tibia, 0.45 × tarsus, 3 × second tarsomere, fourth tarsomere very short, fifth 1.9 × as long as third. Fore wing with vein Rs & M slightly basad of cu-a, 2 rs-m about 0.7 × distance between 2 rs-m and 2 m-cu, vein cu-a slightly inclivous, vein Cu 1 a separated from 1 m-cu by length of vein Cu 1 b; hind wing first abscissa of vein Cu 1 1.2 × longer than vein cu-a.

Metasoma. Metasoma 1.7 × head and mesosoma combined; tergites with fine punctures, pubescent, base of tergites 3–5 coriaceous; first tergite 2.3 × as long as apical width, dorsolateral carina weakly complete, median longitudinal carina strongly present to oblique groove; second tergite 0.8 × length of first, 1.15 × as long as apical width, basal and apical oblique grooves deep, rhombic area convex and polished; third tergite slightly shorter than second, basal and apical oblique grooves moderately deep, median area convex; first sternite with some oblique ridges basally, strongly convex and rounded apically; ovipositor straight, length from tip of hypopygium 0.75 × length of hind tibia, lower valve slightly swollen medially, tapered to sharp point.

Colour. Reddish brown. Antenna brownish yellow, mandible, palpi and tegula yellow; scutellum and post-scutellum reddish; legs reddish, except fore and mid coxae and trochanters yellow, subbasal and apical bands of hind tibia and hind tarsus fuscous; wings hyaline, pterostigma and veins brownish yellow; ovipositor reddish.

Male. Unknown.

Distribution

Currently known only from Hoang Lien NP, Fansipan Mt, Lao Cai Province, North Vietnam ( Figure 7 ).

Ecological note

The single specimen was collected in montane evergreen forest at an altitude of 1550 m a.s.l.

Comparison

The new species differs from its congeners by its colour pattern and slender legs. Moreover, this species can be distinguished from other species of Brachyzapus from Vietnam, as well as B. unicarinatus from Russia and northeastern Asia, by its smooth, not foveolate mesopleural suture.

Etymology

The specific epithet refers to the Hoang Lien National Park, the type and only known locality for this new species .

Figures

Figure 5. Brachyzapus hoanglienensis sp. nov. holotype female: (A) lateral view; (B) lateral view of mesosoma; (C) dorsal view of head and mesoscutum; (D) ovipositor; (E) face; (F) dorsal view of scutellum, metascutellum and propodeum; (G) metasternum and sternite 1; (H) dorsal view of tergites 1–3; (I) wings.

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