Oxysarcodexia intona Det. H. S. Lopes

Oxysarcodexia intona (Curran & Walley, 1934)

(Figs 154–156)

Sarcophaga intona Curran & Walley, 1934: 489; Guyana, Kartabo. Holotype male and female allotype in AMNH (not examined).

Sarcophaga intonsa: Lopes (1969: 26), incorrect subsequent spelling of intona Curran & Walley, 1934.

Diagnosis. Male. Length 8.0–9.0 mm. Postocular plate with golden pollinosity. Ocellar bristles weakly developed. Thorax and abdomen with silvery pollinosity, T5 with golden pollinosity, although not along the entire extension. Two well-differentiated posterior and 1–3 smaller anterior post-sutural dorsocentrals.Apical scutellar bristles absent. Legs brownish. T4 with no median marginal and 3 pairs of lateral marginal bristles. ST5 with deep median cleft with margins almost parallel and with bristles at apex of arms. Cercus sinuous in lateral view, apex expanded and with concave margin. Cercus with bristles ventrally only in distal third. Cerci with distal third as broad as middle part in posterior view; diverging. Pregonite with expanded base and sudden narrowing at apex, which is darker than base. Postgonite like pregonite, except unicolorous. Distiphallus with a large membranous dorsoapical swelling, smooth ventroapical margin, ventroapical projections, lateral lobes, rounded apex and sinuous dorsal outline. Vesica symmetrical, with angular median projection of main branch; distal lobes reduced, with filaments, tapering, partially membranous, with spines on both dorsal and ventral surfaces.

Remarks. See under O. aurata. The female of O. intona has T7 membranous (Tibana & Mello 1985).

Distribution. NEOTROPICAL. Brazil (Amazonas, Amapá, Ceará, Espírito Santo, Maranhão, Minas Gerais, Pará, Pernambuco, Rio de Janeiro), Guyana.

Biology. This species has been collected on pig, rat, and fish carcasses in the Brazilian Cerrado, rainforest environments, areas of degraded vegetation, sandy beaches, and urban and insular areas (Pamplona et al. 2000; Barbosa et al. 2009; Vasconcelos & Araujo 2012; Vasconcelos et al. 2013; Barbosa 2015; Carmo & Vasconcelos 2016; Barbosa et al. 2017; Carmo et al. 2017). It has also been collected in palm groves, marshland and mangrove areas (Sousa et al. 2016). Baits such as feces, banana mixed with brown sugar, rotten cow liver and lung, dead fish, sardine, chicken liver, and squid have been used in W.O.T., Shannon and “can/bottle” traps (Lopes 1975a; Pamplona et al. 2000; Oliveira et al. 2002; Barbosa 2015; Barbosa et al. 2015; Sousa et al. 2015; Carmo & Vasconcelos 2016; Sousa et al. 2016; Barbosa et al. 2017). Oxysarcodexia intona is considered an early visitor in forensic entomology (Vasconcelos et al. 2013). In the Brazilian state of Maranhão, albeit a dominant species, O. intona was classified as an intermediate species, according to its occurrence, due to its accessory status, and it was recorded only at 25% to 50% of the study sites (Sousa et al. 2015). In Itamaracá, a continental island (Pernambuco state, Brazil), O. intona was considered an accidental species, collected in areas of low, moderate and high anthropogenic impact (Carmo & Vasconcelos 2016). Barbosa et al. (2017) considered O. intona as showing a weak preference for modified beaches.

Material examined. [♂] RIO DE JANEIRO, BRASIL / R. Tibana / NRM-DIPT 0014318 [NRM] // [♂] Guarapari, Esp. Santo, Brasil / H. S. Lopes, 9.I.75 / Oxysarcodexia intona ♂ (C. et w.), det. H. S. Lopes [NHMD] // [♂] [Brazil] Inst. Agr. do Norte Pará—28-5-56 E. Lobato / Oxysarcodexia intona (Curran & Walley) Det. H. S.Lopes ♂ [MNRJ] // [♂] S. Miguel do Guamá Est. do Pará Brasil 16/24 X-959 E. Lobato / Oxysarcodexia intona (Curran & Walley) Det. H. S. Lopes ♂ [MNRJ].