Mesembrinella semihyalina Mello, 1967,

Whitworth, Terry L. & Yusseff-Vanegas, Sohath, 2019, A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea), Zootaxa 4659 (1), pp. 1-146: 131-132

publication ID

publication LSID

persistent identifier

treatment provided by


scientific name

Mesembrinella semihyalina Mello, 1967


Mesembrinella semihyalina Mello, 1967 

( Figs 87–88View FIGURES 87–92, 177–178View FIGURES 173–182, 231View FIGURES 229–235, 274View FIGURES 266–279, 318View FIGURES 318–323, 362View FIGURES 350–369, 403View FIGURES 401–410, 447View FIGURES 439–453, 488View FIGURE 488)

Mesembrinella semihyalina Mello, 1967: 73  . Holotype male (FIOC), not examined. Type locality: Parque Sooretama , Espirito Santo, Brazil.

Mesembrinella semihyalina: Toma & Carvalho (1995: 138)  ; Kosmann et al. (2013: 78); Wolff (2013: 121); Marinho et al. (2017: tab. 1); Cerretti et al. (2017: tab. 2).

Diagnosis. A medium-sized fly averaging 12.2 mm (11–13/5) in length. Wing infuscated; supravibrissal setae brown; subcostal sclerite setose; wing with section IV 0.23 of section III; male phallus in dorsal view with weak serrations ( Fig. 178View FIGURES 173–182); legs entirely orange. Male frons about 0.06 of head width at narrowest; epandrium, cerci and surstyli as in Figs. 87–88View FIGURES 87–92. Female T6 of WU shape ( Fig. 318View FIGURES 318–323).

Redescription. Male. Head. Frons 0.063 (0.06–0.07/3) of head width at narrowest. Fronto-orbital and parafacial pale silvery when viewed from above, pale orange when viewed from below; frontal setae ascending halfway to vertex; frontal vitta dark orange, obliterated midway; gena pale orange with horizontal row of few dark setae anteriorly, otherwise with small dark setae; postgena pale yellow with fine yellow setae; occiput with pale yellow tomentum and yellow setae; median occipital sclerite shiny black; antenna orange, first flagellomere with pale tomentum, arista dark orange; palpus typical; eye with median facets 3x size of lateral facets; ocellar triangle medium-sized, anterior ocellus 2x size of posterior ocelli; short row of tan supravibrissal setae on facial ridge ascending, about 1/6 of distance to antennal base.

Thorax. Dorsum with alternating dark brown areas with yellowish tomentose stripes; pleura dark orange with whitish tomentum; spiracles small, pale orange; chaetotaxy: ac variable, 2:1or 2:2, sometimes one or more setae missing, dc 2:3, ia 1, ph 1, ppn 3x 3, kat 1:1, meral setae typical, 1 pair of parallel ap, sa and lat absent, 1 bas, 1 weak pb, 1 disc; subscutellum moderately developed; spiracles medium-sized, pale yellow; legs entirely orange. Wing faintly infuscated along distal 2/3 of costa through R 2+3 and along veins; basicosta and tegula pale orange; section IV 0.23 of section III; upper calypter with pale disc and dark rim with reddish setae; lower calypter with pale disc and rim, rim with long pale setae.

Abdomen. T1+2 dark orange; T3–T5 shiny blue with patchy white tomentum; rear margins of T4–5 with stout setae; disc of T5 with dense, medium-long, fine setae only. Terminalia in lateral view with surstylus broad, with gradual backward curve, cercus with apical hook ( Fig. 87View FIGURES 87–92); in posterior view, base of cerci broad, relatively short and stout, narrowing apically to chisel-like tip ( Fig. 88View FIGURES 87–92); phallus in lateral view with epiphallus short and stout with slight backward curve ( Fig. 177View FIGURES 173–182); in dorsal view, hypophallic lobes slightly rounded with shallow, moderate serrations ( Fig. 178View FIGURES 173–182). T6, STS7+8, pre- and postgonite, ejaculatory sclerite and ST6 as in Fig. 231View FIGURES 229–235; ST2–5 as in Fig. 274View FIGURES 266–279.

Female. Similar to male except frons 0.248 (0.23–0.26/5) of head width at narrowest. T6 of WU shape; T7 continuous; T8 narrowed midway; epiproct divided midway ( Fig. 318View FIGURES 318–323); ST6–8 and hypoproct as in Fig. 362View FIGURES 350–369; spermathecae filiform ( Fig. 403View FIGURES 401–410); ST1–5 as in Fig. 447View FIGURES 439–453.

Type material examined. PARATYPE: Brazil, Distrito Federal. 1 ♂, Parque Sooretama (Cupido), E. Santo, L. Travis, H. Travis, II/III-948 ( CNC)  .

Additional material examined. Brazil, Alagoas. 1 ♀ ♦ ( TLW392)  , Murici , 26–30.vii.2012, S.S. Nihei, P.G. Dias, D.M. Alcantara, C.S. Costa ( NHMUK)  ; 1 ♂♦, same data except ( TLW392) ( NHMUK)  . São Paulo. 1 ♂*, 11.ii.1923, L.G. Saunders ( NHMUK)  . Rio de Janeiro. 1 ♂*, Angra dos Reis, E. de Rio ( CNC)  ; 1 ♀, Angra do Reis , 29.v.1972, H.S. Lopes ( CNC)  . Rondônia. 1 ♀ *, 3 ♀♀, Caucalândia, 10°32ʹS 62°48ʹW, 21.x.1991, 1 ♀ ♦ ( TLW432)GoogleMaps  , J. McDonald ( MEM)  ; 1 ♀ *, 62 km, SW Ariquemes nr Fzda. Rancho Grande , 6–15.xii.1990, D.A. Rider, J.E. Eger ( FSCA)  .

Distribution. Brazil.

Remarks. Bonatto (2001) argued that this species is a synonym of M. abaca  [here considered a synonym of M. socors  ], but M. semihyalina  has a distinct, dark infuscation in cells r 1 and r 2+3, while M. socors  has, at most, a faint yellowing in the r 1 cell along the costa. The known range of M. semihyalina  is Brazil, whereas M. socors  is known only from Central America. Two specimens of M. semihyalina  ( TLW 392 and TLW 432) were barcoded; they clustered together, close to M. anomala  and distant from M. socors  (genetic distance 12%) ( Fig. 488View FIGURE 488), supporting the morphological differentiation between these two species.


Wayland University


Canadian National Collection of Insects, Arachnids, and Nematodes


Natural History Museum, London


University of Memphis


Florida State Collection of Arthropods, The Museum of Entomology














Mesembrinella semihyalina Mello, 1967

Whitworth, Terry L. & Yusseff-Vanegas, Sohath 2019

Mesembrinella semihyalina: Toma & Carvalho (1995: 138)

Kosmann, C. & Pinto de Mello, R. & Harterreiten-Souza, E. S. & Pujol-Luz, J. R. 2013: 78
Toma, R. & Carvalho, C. J. B. de 1995: 138

Mesembrinella semihyalina Mello, 1967: 73

Mello, R. P. de 1967: 73