Brachymeria semirusula, Narendran, T. C. & van Achterberg, Cornelis, 2016

Narendran, T. C. & van Achterberg, Cornelis, 2016, Revision of the family Chalcididae (Hymenoptera, Chalcidoidea) from Vietnam, with the description of 13 new species, ZooKeys 576, pp. 1-202: 55-59

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taxon LSID

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scientific name

Brachymeria semirusula

sp. n.

Taxon classification Animalia Hymenoptera Chalcididae

Brachymeria semirusula  sp. n. Figs 65, 66-67

Type material.

Holotype, ♀ ( RMNH), "S. Vietnam: Dak Lak, Chu Yang Sin N. P., n[ea]r dam, c. 500 m,, Mal. traps, C. v. Achterberg & R. de Vries, RMNH’07”.


This new species resembles Brachymeria croceogastralis  Joseph, Narendran & Joy in having metasoma with red colour, but differs from Brachymeria croceogastralis  in having: 1) hind tibia black with a faint brown subbasal spot and yellow apex (in Brachymeria croceogastralis  hind tibia whitish yellow with 0.4 length of tibia from base black without any subbasal spot and the black colour extending to apex through ventral margin); 2) hind coxa and femur black with apex of femur pale yellow (in Brachymeria croceogastralis  hind coxa and femur liver brown with apex yellow); 3) T1 not reaching middle of metasoma (in Brachymeria croceogastralis  T1 reaching middle of metasoma); 4) area below scrobe punctate (in Brachymeria croceogastralis  area below scrobe narrow and smooth medially; 5) malar space 0.6 × height of eye (in Brachymeria croceogastralis  malar space 0.3 × height of eye); 6) clava 1.2 × as long as wide (in Brachymeria croceogastralis  clava 1.6 × as long as wide) and 7) fore wing 2.7 × as long as wide (in Brachymeria croceogastralis  fore wing less than 2.5 × as long as wide).


Holotype, ♀, length of body 4.1 mm.

Colour. Black with following parts as follows: eyes grayish yellow with reflecting yellow spots; ocelli pale reflecting yellow; antenna reddish pink; tegula whitish yellow; all coxae and femora black with apices of femora yellow; fore and mid tibiae yellow with slight darker patch at middle; hind tibia black with a weak brown subbasal spot and yellow apex; tarsi yellow; metasoma red with black dorsally on median part of T1, and anterior halves of T2 to T5. Pubescence silvery on head and mesosoma but golden on metasoma.

Head. Width of head 1.2 × its height in dorsal view, 2.5 × as broad as long in dorsal view, 1.1 × as broad as pronotum; parascrobal area not bulging; fronto-vertex 1.2 × eye height in anterior view; malar ridge present; malar space 0.4 × eye height in profile; pre-orbital carina absent; post-orbital carina slightly branched, reaching geno-temporal margin; scrobe almost reaching anterior ocellus; POL 2.3 × OOL; AOL equal to OOL; LOL a little longer than OOL (4:3); width of interocular space 2.9 × POL; face and vertex with close umbilicate, setigerous pits, interstices rugulose, narrower than diameter of a pit; interantennal projection shortly grooved, with 6 setae on either side; upper margin of clypeus angulate medially, not smoothly curved, with scattered pubescence, raised and removed from antennal sockets by about clypeal height in middle. Antennal formula 11173; scape not reaching anterior ocellus; relative L:W of antennal segments:scape = 11:3; pedicel = 2:3; F1 = 4:4; F2 = 3:4; F3 = 3:4; F4 = 3:4; F5 = 3:5; F6 = 3:5; F7 = 3:5; clava = 6:5.

Mesosoma. Mesosoma 1.1 × as long as broad (at mesoscutum); mesoscutum as broad as pronotum, interstices carinate and most areas with micro-reticulations; pilosity dense all over including apex of scutellum; pronotum with anterior carina moderately strong, confined to sublateral thirds of sclerite; notauli slightly curved, distinctly groove like with pits; scutellum slightly convex and gradually sloping to apex, its width sub-equal to its length, in dorsal view apical rim slightly emarginate, subvertical to scutellum; propodeum with large deep pits and alveolae; septa of areolation relatively high; postspiracular teeth absent; submedian tooth of anterior margin of mesopleuron distinct; metapleuron densely pubescent.

Wings. Fore wing 2.7 × as long as its breadth; relative length of CC = 27; SMV = 19; MV = 13; PMV = 6; STV = 3.

Legs. Hind coxa without any tooth; ventral side closely punctate and pubescent; hind femur twice as long as broad (excluding teeth), with 10 teeth on outer ventral margin, externally and internally densely punctate with dense short pubescence.

Metasoma. Metasoma ovate, only slightly pointed posteriorly in dorsal view, 0.7 × as broad as long, subequal to length of mesosoma; T1 slightly shorter than half as long as metasoma, smooth, lateral pubescence very fine with a very few setae present as a small lateral patch; T2 micro-reticulate with a few setigerous pits laterally; T3 to T5 with 2 rows of golden pilosity on each tergite; T6 with 7 cross rows of pits, each pit with a seta, interstices of pits narrower than diameter of a pit, with micro-sculpture; epipygium 0.4 × length of T6, without distinct median carina; ovipositor sheath hardly visible in dorsal view, with a bunch of setae at apex; hypopygium reaching T5.

Male. Unknown.