A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea) Author Whitworth, Terry L. Author Yusseff-Vanegas, Sohath text Zootaxa 2019 2019-08-26 4659 1 1 146 journal article 25918 10.11646/zootaxa.4659.1.1 0cbe0b8e-2019-4f5a-8336-2d4d9fcd8bf6 1175-5326 3377239 57309E14-0330-4ED7-BCDA-355EE6618215 Mesembrinella randa ( Walker, 1849 ) ( Figs 85–86 , 175–176 , 230 , 273 , 317 , 361 , 402 , 446 , 479 , 488 ) Dexia randa Walker, 1849: 852 . Lectotype female (NHMUK), here designated. Type locality: Brazil . Eumesembrinella randa : Peris & Mariluis (1984: 263) ; Toma & Carvalho (1995: 142) ; Kosmann et al. (2013: 77) ; Wolff & Kosmann (2016: 866) ; Marinho et al. (2017 : tab. 1); Velásquez et al. (2017: 108) . Mesembrinella randa : Cerretti et al. (2017 : tab. 2). Diagnosis. A large fly averaging 12 mm (11–13/5) in length. Postpronotal setae 2x 2; base of wing mostly hyaline; anterior margin of wing infuscated from costa to vein R 2+3 ; T3–4 concolorous, without distinct posterior bands; posterior edge of T4 lacking marginal setae dorsally; posthumeral seta present, often reduced; rim of upper calypter dark. Redescription. Male. Head. Frons broad, 0.078 (0.07–0.09/5) of head width at narrowest, slightly narrower than width of parafacial at level of lunule; fronto-orbital, parafacial, gena and antenna pale golden, frontal vitta darker orange; frontal setae ascending about 60% of distance to vertex; frontal vitta obliterated midway, gena with typical horizontal row of stout setae midway, otherwise with scattered weak tan setae; posterior margin with few golden setae; postgena orange with pale tomentum and golden setae; occiput dark orange with silvery tomentum and golden setae; median occipital sclerite shiny dark brown; antenna pale gold except brown setae on arista; palpus typical; ocellar triangle medium-sized, anterior ocellus about 2x size of posterior ocelli; supravibrissal setae short and brown, in short row, ascending about 1/10 of distance to antennal base. Thorax. Dorsum dark orange midway, with 4 broad golden tomentose stripes, lateral presutural areas pale orange; pleural area orange; chaetotaxy: ac 0:1, dc 2:3, ia 0, ph 1, often somewhat reduced, ppn 2x 2, kat 1:1, meral setae typical, 1 pair of ac parallel or slightly converging, sa and lat absent, bas typical, 1 weak pb, 1 disc; subscutellum moderately developed; spiracles orange, medium-sized; legs: femora orange, tibiae and tarsi tan to brown. Wing with anterior edge infuscated from costa to R 2+3 ; subcostal sclerite orange and bare; basicosta and tegula orange; section IV 0.30 of section III; discs of upper and lower calypters reddish; rim of upper calypter dark with long pale setae, rim of lower calypter pale with long reddish setae. Abdomen. Dorsum of T1+2–3 orange, T4–5 shiny blue; T3–4 with dorsolateral pair of marginal setae; rear margin of T4 without marginal setae; disc of T5 with dense, short, fine setae only. Terminalia in lateral view: surstylus with moderate backward curve [sharper than in M. quadrilineata ], cercus with apical hook ( Fig. 85 ); in posterior view, cerci broad at base, then tapering gradually to tip ( Fig. 86 ); phallus in lateral view with epiphallus of moderate length and with slight backward curve ( Fig. 175 ); in dorsal view, hypophallus rounded with fine serrations, as in Fig. 176 ; T 6 , STS7+8, pre- and postgonite, ejaculatory sclerite, ST6 and hypandrium as in Fig. 230 ; ST1–5 very narrow, as in Fig. 273 . Female. Similar to male except frons 0.278 (0.25–0.30/5) of head width at narrowest. T6 of FU shape; T7 continuous, darkened midway, pale laterally; T8 as separate sclerites; epiproct divided midway ( Fig. 317 ); ST6–8 and hypoproct as in Fig. 361 ; spermathecae filiform ( Fig. 402 ); ST1–5 as in Fig. 446 . Type material examined. LECTOTYPE ♀ ( Brazil ; NHMUK ; Fig. 479 ), here designated, labeled: Brazil . / Pres. by the / Entomological / Club / 44.12; LECTOTYPE ♀ / Dexia / randa / Walker, 1849 / Designated by / Dear and Pont. [red border]; SYNTYPE ♀ / Dexia / randa Walker / 1849, List Dipt. / Brit. Mus., 4: 852 [red border]; LECTO-/ TYPE [round label with purple border]; Dexia / Type / randa / Walk. [round label with green border]; Ent. Club. / 44-12. Remarks. Dexia randa was described based on at least two specimens from Brazil ( Walker 1849: 853 ), but only one of these type specimens is currently housed in NHMUK (N. Wyatt, pers. comm.). Dear and Pont selected and labeled this specimen as a lectotype for this species, without publishing the designation. The same specimen is here formally designated as the lectotype of this nominal species. The lectotype has a frons to head width of 0.30 at narrowest, 1 small ph and no presutural ia. It is significantly damaged, with 5 legs missing (only left mid leg attached) and the left wing broken off, kept in a vial pinned below the specimen; the macula on the wing is faint and faded. Additional material examined. Bolivia , Tumupasa . 1 ♀ , Mulford Biol. Expl 1921–1922 . Xii , W.M. Mann ( LACM ) . Brazil , Rondônia . 1 ♂*, 4 ♀♀ ♦ ( TLW281 – TLW284 ) , 19 ♀♀ , 62 km SW Ariquemes , nr Fzda. Rancho Grande , 4–16.xi.1997 , Fish Carrion Pitfall , J.E. Eger ( FSCA ) ; 1 ♀ , same data except 6–15.xii.1990 , D.A. Rider & J.E. Eger ( FSCA ) ; 1 ♀ , same data except 17–24.iii. 1989 , 180 m, W.J. Hanson ( LACM ) . Colombia , Caqueta . 1 ♂*, 1 ♂, Rio Orteguaza , nr. Rio Peneya , 14–18.i.1969 , Duckworth & Dietz ( LACM ) . Peru , Cusco . 1 ♂, 1 ♀ , Pilocapata , Villa Carmen , 12°53ʹS 71°24ʹW , v.2014 , Multilure trap , M. Choque ( FSCA ) . Lorenzo . 1 ♂*, 2 ♂♂, Boqueron , 30.vi.1965 , J. Schunke ( LACM ) ; 1 ♀ , same data except 9.vii.1965 ( LACM ) ; 1 ♀ , same data except 4.vii.1965 ( LACM ) ; 1 ♀ , same data except 500 m , 14.vii.1965 ( LACM ) ; 1 ♀ , same data except 22.iii.1964 ( LACM ) ; 2 ♀♀ , 160 km NE Iquitos , Explornapo Camp , 2 km from Rio Napo on Rio Sucusari , 27–31.viii.1992 , human dung trap , J. Castner & Skelley ( FSCA ) . Pasco . 2 ♂♂, 1 ♀ *, 3 km N. Puerto Bermudes , 200 m , jungle, 27.vi.1980 , fish bait, D. Baumgartner , B. Greenberg (BG) ; 1 ♀ , no other data ( CEUA ) . Distribution. Bolivia , Brazil , Colombia , Peru . Guimar„es (1977) listed it from Guyana , Marinho et al. (2017) also listed it from French Guiana and Venezuela . Remarks. Four specimens ( TLW 281–284) were barcoded and formed a distinct group close to M. benoisti ( Fig. 488 ).