Brachygasterina stuebeli (Röder, 1886), Roder, 1886

Pérez, Sandra, Wolff, Marta & De, Claudio J. B., 2012, A new species of Brachygasterina Macquart from Colombia, and description of the males of B. stuebeli Röder and B. muisca Soares & Carvalho (Diptera: Muscidae), Zootaxa 3554, pp. 45-57 : 51-54

Brachygasterina stuebeli (Röder, 1886)

( Figs. 12–19 )

Diagnosis. This species can be easily distinguished from the remaining Brachygasterina species by the setulae on the facial ridge that almost reach the level of aristal insertion, and the female with broad parafacial and gena; in lateral view the parafacial at least 0.5 of first flagellomere width.

General color. Body dark, color metallic bluish-purple. Palpus, antenna, fronto-orbital plate and face dark brown, parafacial and gena reddish brown with brownish-grey pruinosity. Lunula brownish with a silver pruinosity. Thorax with 4 black, inconspicuous bands. Anepisternum and katepisternum dark-brown with metallic blue to bluish-purple. Anepimeron and meron dark-brown. Calypters brownish, with dark-brown margins. Halter darkbrown. Wing brownish with brown veins. Legs dark-brown with a dark blue shine on the femora. Claws black and pulvillus brownish, highly developed. Abdomen metallic bluish-purple

Description. Male. Head. Eye with long and dense hairs, holoptic ( Figs. 12–13 ); frons narrow, about 0.14–0.2 of the head width at the anterior ocellus. Anterointernal ommatidia enlarged. Occiput metallic bluish-purple. Antenna long, postpedicel strongly dilated, 0.53–0.56 of the facial height, antennal insertion below the mid level of the eyes, flagellomere 1.14–1.6 of pedicel height. Arista almost bare. Inner vertical setae (convergent) similar in length to outer vertical setae (divergent); 11–12 pairs of frontal setae. Facial ridge with setulae almost reaches the aristal insertion. Parafacial wide at pedicel level, 0.33–0.38 of the gena width below the eye. Palpus spatulated. Proboscis mainly shiny.

Thorax. Dorsocentral setae 2:4; acrostichal 3:3, anterior pair weaker; 5 humeral, anterior pair weak and 3 strong setae on the posterior margin; 1 parahumeral; 1 post-humeral; 1 presutural; 3 intra-alar setae, anterior short and weak; 1 strong prealar; 2 supra-alar, anterior as long and strong as dorsocentral postsutural, posterior short; 2 post-supra-alar; 2 notopleural setae, posterior shorter than the anterior, notopleuron with dense setulae, mostly around second notopleural seta. Scutellum laterally setulose; with strong apical, basal and lateral setae, and corresponding setae on disc. 1 strong proepisternal seta and 3–4 hairs; 2–3 strong proepimeral setae and many long hairs. Katepisternals 2:3, katepisternum covered by long setulae; anepimeron, katepimeron, meron and metakatepisternum bare. Katatergite distinctly setulose. Postalar wall and supra-squamal ridge bare.

Legs. Fore coxa with long and strong setae on anterior surface. Femur with 1 row of long setae on the dorsal, posterior and posteroventral surfaces. Tibia with preapical dorsal seta, with 1 shorter apical posteroventral, without posterior seta. First tarsal segment twice as long as second, with 2 basal setulae on the ventral surface. Claws and pulvillus highly developed, not highly developed in female. Mid femur with 2 short setae on the preapicals anterodorsal surface, 4 preapicals posterodorsal setae; anterior, posterior and ventral surfaces with thin long hairs. Mid tibia with 3 posterodorsal setae, without anterodorsal or ventral setae; first tarsal segment slightly curved with 1 row of 13 setae on the dorsal surface, with 1 apical ventral tuft of compact setae; second tarsal segment slightly curved with a ventral basal tuft of compact setae, which is adjacent to a similar tuft at the apex of the first tarsal segment ( Fig. 14 ). Hind coxae with a strong tuft of truncate setae at anterior ventral surface. Hind femur with 1 row of long anteroventral and anterodorsal setae ( Fig. 15 ); posteroventral surface with 1 strong seta on apical third; 2 posterodorsal preapical setae. Hind tibia with 3 anterodorsal setae; 2–3 anteroventral; 1 preapical dorsal setae; 1 anterodorsal and anteroventral apical setae; 1 strong posterodorsal setae (“calcar”).

Wing. Smoky, veins dark-brown. Veins bare, except for Costa. Crossvein dm-cu very sinuous. R4+5 bare on both surfaces. M vein slightly upcurved towards R4+5 ( Fig. 19 ). Calypters dark brown, lower one slightly longer than upper one.

Abdomen. Sternite 1 bare. Male genitalia: sternite 5 ( Fig. 16 ); cercal plate, surstylus and epandrium ( Fig. 17 ); aedeagus and phallic complex ( Fig. 18 ).

Measurements (n=2): Body length, 7.9–8.0 mm. Wing length, 7.6–7.9 mm.

Examined material: “CO. [ Colombia, Cundinamarca] PNN [Parque Nacional Natural] Chingaza, Estación Monte Redondo, 3035 m, 05/10/2002, E. Martinez, 10494 [code]” ( CEUA 1 male). Other specimens with the same label information, except for: “M.Capt/Forense-Cerdo #1 [capture method]/13-oct [October]-2002/10614 [code]” [dissected specimen], ( CEUA: 1 male); “Capt/Forense-Cerdo#3 [capture method]/ 18sep [September]-02/ CEUA F 7575 [code]”, (IAvH: 1 female); “M. Capt/Forense-Cerdo#3 [capture method]/ 18sep [September]-02/ CEUA F 7519 [code]”, ( CEUA: 1 female); “M. Capt/Forense-Cerdo#3 [capture method]/ 17oct [October]-02/ CEUA F 7668 [code]”, (1 female); “CO [ Colombia] Boyacá/SFF [Santuario de Fauna y Flora] Iguaque Lagunilla [site]/ 5°25’N;73°27°W. 3380 m.s.n.m [meters above sea level]/Malaise [trap]/ Mar-9-28 de 2001. 1511[code]”(IAvH: 2 females)

Geographical distribution. Colombia, Ecuador.

Comments. This species was collected from a decomposing pig that was used as bait. Previously, only females of B. stuebeli had been collected and described.

Figures

FIGURES 12 – 15. Male of Brachygasterina stuebeli Röder: 12, head, frontal view; 13, head, lateral view; 14, mid leg, anterior view; 15, hind leg, anterior view.

FIGURES 16 – 19. Brachygasterina stuebeli Röder; 16, sternite 5, male; 17, epandrium, cercal plate and surstyli, male, in posterior view; 18, aedeagus and phallic complex, in lateral view; 19, wing female, dorsal view.