Mesembrinella velasquezae Whitworth

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: 137-138

publication ID

publication LSID

persistent identifier

treatment provided by


scientific name

Mesembrinella velasquezae Whitworth

sp. nov.

Mesembrinella velasquezae Whitworth  , sp. nov.

( Figs 97–98View FIGURES 93–98, 187–188View FIGURES 183–192, 236View FIGURES 236–238, 279View FIGURES 266–279, 323View FIGURES 318–323, 367View FIGURES 350–369, 408View FIGURES 401–410, 452View FIGURES 439–453, 485View FIGURES 484–487)

Diagnosis. A large fly averaging 15.2 mm (14–16/5) in length. Stem vein bare; distal 2/3 of wing infuscated from costa to vein R 4+5 and also around vein M; dorsum of abdomen without pale tomentose pits; section IV of wing 0.63 of section III; supravibrissal setae bright orange and in a broad cluster ascending about 40% of distance to antennal base; all legs reddish; subcostal sclerite with long, pale setae. Epandrium, cerci and surstyli as in Figs 97–98View FIGURES 93–98. Female terminalia as in Fig. 323View FIGURES 318–323.

Description. Male. Head. Frons narrow, 0.018 (0.015 –0.020 /5) of head width at narrowest. Frons, parafacial, pedicel, first flagellomere and gena orange with pale whitish tomentum; frontal setae ascending about 40% of distance to vertex; frontal vitta obliterated at about 40% of distance to vertex; gena orange with pale tomentum and horizontal row of stout, dark setae at ventral edge, otherwise with few weak, reddish setae; postgena orange with fine golden setae; occiput with dense yellowish tomentum and pale setae; median occipital sclerite shiny dark orange; antenna entirely orange; palpus typical; eye with median facets about 2x size of lateral facets; ocellar triangle small, anterior ocellus about 2x size of posterior ocelli; supravibrissal setae bright orange, forming broad cluster over about 1/2 of distance to antennal base.

Thorax. Dorsum dark orange with four irregular pale tomentose stripes; pleura orange; chaetotaxy: ac 2:1, dc 2:3, ia 0 in most specimens, sometimes a small seta present, ph 1, ppn 3x 3, kat 2:1, meron with long, slender orange setae in form of an inverted L, 1 pair converging ap, sa and lat absent, 1 stout bas, 1 weak pb, 1 disc; subscutellum moderately developed; spiracles large, pale yellow; legs entirely orange. Wing with dark infuscation from costa to vein R 4+5 and around vein M; subcostal sclerite setose; basicosta and tegula orange; section IV 0.63 of section III; discs of upper and lower calypters faintly orange; rim of upper calypter dark with short pale orange setae, rim of lower calypter pale with long pale orange setae.

Abdomen. T1+2 and anterior 2/3 of T3 yellow-orange with whitish tomentum, rear margin of T3 blue-black, dorsum of T4 blue-black, T4yellow orange laterally; T5 entirely blue-black; rear of T4 with row of stout marginal setae, posterior margin of T5 with row of short, fine setae; disc of T5 with dense, medium-long, fine setae only. Terminalia. Surstylus in lateral view with slight backward curve, cercus with apical hook ( Fig. 97View FIGURES 93–98); in posterior view, bases of cerci broad, then gradually narrowing to tip ( Fig. 98View FIGURES 93–98); phallus in lateral view as in Fig. 187View FIGURES 183–192; in dorsal view, hypophallic lobes narrow ( Fig. 188View FIGURES 183–192); T6, STS7+8, pre- and postgonite, ejaculatory sclerite and ST6 as in Fig. 236View FIGURES 236–238; ST2–5 broad, as in Fig. 279View FIGURES 266–279.

Female. Similar to male except frons 0.25 (0.24–0.26/5) of head width at narrowest. T6 of OV shape, posterior edge with an inverted V incision midway; T7 narrowed midway with suture; T8 as separate sclerites; epiproct divided ( Fig. 323View FIGURES 318–323); ST6–8 and hypoproct as in Fig. 367View FIGURES 350–369; spermathecae filiform ( Fig. 408View FIGURES 401–410); ST1–5 as in Fig. 452View FIGURES 439–453.

Type material. Venezuela, Lara. HOLOTYPE ♂* ( MJMO; Fig. 485View FIGURES 484–487), labeled: VENEZUELA, Edo. Lara / PN Yacambú-El blanquito / 11-16/03/02 / Leg  : -; HOLOTYPE / Mesembrinella  / velasquezae / T.L. Whitworth.

ALLOTYPE ♀: Venezuela, Trujillo. P.N. Guaramacal, 09°19ʹ02ʺN 70°15ʹ48ʺW, 1480 m, 14–20.ii.2002, R. Briceñò, A. Chacán, J. Clavijo, F. Díaz, R. Paz., E. Arcaya, L. Joly, Proyecto S 1–2000000479 ( INBIO).GoogleMaps 

PARATYPES: Venezuela, Lara. 1 ♂, PN Yacambu, El Blanquito , 11–16.iii.2002, R. Briceño, A. Chacón, J. Clavijo, F. Díaz, R. Paz., E. Arcaya, L. Joly, Proyecto S1–2000000479 ( MJMO)  . Trujillo. 1 ♂*, 1 ♀ *, 1 ♀, P.N. Guaramacal, 09°19ʹ02ʺN 70°15ʹ48ʺW, 1480 m, 14–20.ii.2002, R. Briceño, A. Chacán, J. Clavijo, F. Díaz, R. Paz., E. Arcaya, L. Joly ( MJMO)GoogleMaps  ; 1 ♀ *, 1 ♀, P.N. Guaramacal , 15–20.x.2001, [no collector] ( MJMO)  ; 2 ♂♂, Barinis, San Isidro , 14 km Sur La Soledad, 1500 m, 30–31.v.1975, R.E. Dietz ( MIZA)  .

Distribution. Venezuela.

Remarks. Amplification of barcodes was attempted for six specimens, but failed for all.

Etymology. The species name velasquezae  was chosen in honor of Yelitza Velásquez, a Venezuelan entomologist who provided much of the material from Venezuela examined for this project.


Universidad Centro Occidental, Decanato de Agronomia


Museo del Instituto de Zoologia Agricola Francisco Fernandez Yepez