Mesembrinella randa
Creators: name: Whitworth, Terry L.
name: Yusseff-Vanegas, Sohath
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Calliphoridae
Mesembrinella
Mesembrinella randa

description: 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).
description: Published as part of Whitworth, Terry L. & Yusseff-Vanegas, Sohath, 2019, A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea), pp. 1-146 in Zootaxa 4659 (1) on pages 129-131, DOI: 10.11646/zootaxa.4659.1.1, http://zenodo.org/record/3377239