Brachyzapus fansipanensis, 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 : 1649-1652

Brachyzapus fansipanensis sp. nov.

( Figure 4 )

Material examined

Holotype (female). Lao Cai, Hoang Lien NP, Fansipan Mt , 2100 m a.s.l., 22 ◦ 19’ N, 103 ◦ 47’ E, 23–26 October 2001, Malaise trap, P. Q. Mai leg. ( RMNH).

Diagnosis

Inner margins of eyes slightly convergent medially; malar space 0.5 × basal width of mandible; scutellum with lateral carina present basally, laterally with strong transverse ridges; mesopleuron with mesopleural suture foveolate, epicnemial carina ventrally strongly sinuous; metasternum dense with transverse ridges; propodeum with posterior transverse carina strong; first tergite without distinct median longitudinal carina, first sternite with transverse ridges on basal 0.4, centrally rounded, weakly convex.

Description

Body length 11 mm, fore wing 9.5 mm, ovipositor 2.6 mm.

Head. Antenna with 27 flagellomeres, first flagellomere 1.4 × length of second; diameter of lateral ocellus 1.15 × ocellar–ocular distance; frons impunctate, polished; inner margins of eyes slightly convergent medially; face 1.4 × as high as wide, pubescent, upper margin broadly concave between antennal sockets; clypeus moderately convex, about 0.6 × as high as wide, apical margin thin, emarginate; malar space about 0.5 × basal width of mandible; mandible twisted, upper tooth much longer than lower tooth; occipital carina complete, meeting hypostomal carina about 1.4x 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 polished, dorsal part and posterior corner pubescent; mesoscutum convex, moderately densely setose, with notauli deep, convergent at posterior 0.3 in shallow hollow; scutellum strongly convex, pubescent basally, laterally with strong transverse ridges, lateral carina present basally; mesopleuron subpolished, with scattered hairs, mesopleural suture foveolate, epicnemial carina present on lower 0.6, ventrally strongly sinuous; metapleuron convex, bare and polished, pubescent dorsally along pleural carina, submetapleural carina forming small lobe anteriorly, posteriorly angled about 120 ◦; metasternum with many strong transverse ridges from above level of posterior angulation onward to middle of hind coxa, almost touching median longitudinal groove; propodeum moderately convex, pubescent laterally, dorsally mostly bare and polished, lateral longitudinal carina present on apical 0.5, posterior transverse carina strong. Legs with mid and hind tibiae slightly swollen subbasally; fore femur 4 × as long as wide; hind femur 5.2 × longer than wide, length 0.8 × tibia, tibia 10 × as long as apical width; basitarsus longer than following three tarsomeres combined, length 0.35 × tibia, 0.47 × tarsus, 2.6 × 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 1.5 × length of vein Cu 1 b; hind wing with first abscissa of vein Cu 1 1.15 × longer than vein cu-a.

Metasoma. Metasoma 1.8 × longer than head and mesosoma combined; tergites with fine punctures, except first two tergites polished, base of tergites 3–5 coriaceous; first tergite 2.6 × as long as apical width, median part convex, dorsolateral carina complete, median longitudinal carina indistinct; second tergite 0.75 × length of first tergite, 1.1 × as long as apical width, basal and apical oblique grooves moderately deep, rhombic area moderately convex; third tergite 0.83 × as long as second tergite, basal and apical oblique grooves weak; first sternite with transverse ridges present on 0.4 basally, weakly convex and rounded centrally; ovipositor slightly up-curved at tip, length from tip of hypopygium 0.82 × length of hind tibia, lower valve slightly swollen medially, tapered to sharp point.

Colour. Black. Antenna brownish yellow, mandible, palpi and tegula yellow; scutellum and post-scutellum reddish; legs reddish brown, except fore and mid coxae yellow, mid and hind trochantellus slightly darker; wings yellowish, pterostigma and veins brownish yellow; metasoma brown; ovipositor reddish brown.

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 2100 m a.s.l.

Comparison

In general appearance, the new species is similar to Brachyzapus convexus sp. nov.; however, it can be separated from the latter by its metasternum and lateral sides of the scutellum with dense, strong transverse ridges, the finely punctate metasomal tergites, coriaceous only at the bases of tergites, and the first sternite with transverse ridges on the basal 0.4.

Etymology

We name the new species Brachyzapus fansipanensis after the type locality.

Figures

Figure 4. Brachyzapus fansipanensis sp. nov. holotype female: (A) lateral view; (B) face; (C) wings; (D) dorsal view of scutellum, metascutellum and propodeum; (E) dorsal view of tergites 1–2; (F) ovipositor; (G) lateral view of mesosoma; (H) dorsal view of head and mesoscutum; (I) metasternum and sternite 1.

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