Oxysarcodexia fluminensis Lopes, 1946

Souza, Carina Mara De, Pape, Thomas & Thyssen, Patricia Jacqueline, 2020, Oxysarcodexia Townsend, 1917 (Diptera: Sarcophagidae) - a centennial conspectus, Zootaxa 4841 (1), pp. 1-126 : 55-56

Oxysarcodexia fluminensis Lopes, 1946

( Figs 123–125 )

Oxysarcodexia fluminensis Lopes, 1946b: 104 ; Brazil, Rio de Janeiro, Guanabara , Grajaú. Holotype male, female allotype, 25 male paratypes and 14 female paratypes in MNRJ.

Diagnosis. Male. Length 6.0– 8.5 mm. Postocular plate with golden pollinosity. Ocellar bristles well developed. Thorax as well as abdomen with silvery pollinosity; T5 partly with golden pollinosity. Two well-differentiated posterior and 1–3 smaller anterior post-sutural dorsocentrals. Apical scutellar bristles present. Legs blackish. T4 with 1 pair of median marginal and 1 pair of lateral marginal bristles. ST5 with deep median cleft with margins almost parallel and with pilosity. Cercus straight in lateral view, with expanded obliquely cut apex and dorsal subapical barb. Cercus with bristles ventrally only in distal third. Cerci with distal third narrower than middle part in posterior view; diverging. Pregonite with expanded base, gradually narrowing to apex, which is darker than base. Postgonite with expanded base and sudden narrowing at apex; unicolorous. Distiphallus with ventroapical concavity with serrated margin, a lateroapical furrow, rounded apex and sinuous dorsal outline. Vesica symmetrical, with rounded median projection of main branch; distal lobes well developed, with filaments, tapering, sclerotized, with lateral lobes and spines only along margins.

Remarks. Distiphallus with a distinct ventroapical concavity with serrated margin ( Fig. 124 ). The female of O. fluminensis has T7 divided into two plates ( Tibana & Mello 1985).

Distribution. NEOTROPICAL. Brazil (Distrito Federal, Espírito Santo, Mato Grosso, Mato Grosso do Sul, Minas Gerais, Pernambuco, Rio de Janeiro, São Paulo), Colombia.

Biology. This species has been reared under laboratory conditions ( Lopes 1973b) on dog and primate feces, dead mice, crab ( D’Almeida 1989) and fish ( D’Almeida 1986). Adults have been collected on pig carcasses ( Barros et al. 2008; Barbosa et al. 2009; Rosa et al. 2011; Vasconcelos et al. 2013; Vairo et al. 2014; Faria et al. 2018; Paseto et al. 2019) and human corpses ( Oliveira-Costa et al. 2001). D’Almeida (1984) collected this fly using fish, bovine liver and human feces (in decreasing order of attractivity) as bait and calculated a high synanthropic index for it. Besides the above, baits such as human feces, cow liver and lung, chicken viscera and liver, fish (sardine), crab, squid, rotten banana mixed with brown sugar, and rotten S. comosa have been used to collect this species ( Lopes 1973b; D’Almeida & Lima 1994; Pamplona et al. 2000; Oliveira et al. 2002; Leandro & D’Almeida 2005; Vasconcelos & Araujo 2012; Ramírez-Mora et al. 2012; Barbosa et al. 2014, 2015, 2017). Adults have been collected either through active methods or using baited traps or wind-oriented traps in forest environments, an urban area, coastline areas, sandy beaches, humid tropical rainforest, mesophytic semi-deciduous forest, pasture, Brazilian Cerrado, and in Rio de Janeiro Zoological Garden ( Pamplona et al. 2000; Oliveira et al. 2002; Leandro & D’Almeida 2005; Barros et al. 2008; Barbosa et al. 2009; Rosa et al. 2011; Vasconcelos & Araujo 2012; Vasconcelos et al. 2013; Vairo et al. 2014; Barbosa et al. 2015, 2017; Faria et al. 2018; Paseto et al. 2019). This species was collected only in the dry season in pasture and forest areas of the Brazilian Cerrado ( Faria et al. 2018; Paseto et al. 2019). Barbosa et al. (2017), when collecting flies on sandy beaches, indicated O. fluminensis as being restricted to areas of intermediate human impact. With regard to forensic importance, O. fluminensis is considered an early visitor ( Vasconcelos et al. 2013) and has been collected in association with the fresh, bloated, decay, post-decay, and skeletal stages of decomposition of an unburned pig carcass and—with the exception of the fresh stage—also of a burned one ( Oliveira-Costa et al. 2014).

Type material examined. Holotype ♂: [ Brazil] CULTURA N.287 / GRAJAHÚ Rio de Janeiro Lopes / Holotype / Oxysarcodexia fluminensis [no italics] sp. n. Lopes. det. 1944 / MNRJ 2240 [typed vertically on left side of label] [ MNRJ] .

Other material examined. [ ♂] Oxysarcodexia fluminensis sp 7 / COLOMBIA: Antioquia, Copacabana, Ankon , 06°22′1″N 75°29′22,3″W 1.417m 4.viii.2010 Tr VSR 09: 35 M. A. Ramírez, I. Cadavid, C. Rave, Leg M 08CP1 sp 7 [ CE-TdeA] // [♂] H.S.Lopes II-73 cult.1105 / Angra dos Reis E. do Rio, BRASIL. / CULT [ MNRJ] .

Figures

FIGURES 123–131. Oxysarcodexia spp., males. 123–125. Oxysarcodexia fluminensis Lopes (Colombia, Antioquia, Copacabana, CE-TdeA). 123. Habitus, lateral view. 124. Terminalia, lateral view. 125. Terminalia, posterior view. 126–127. Oxysarcodexia fraterna Lopes (no locality mentioned, MNRJ). 126. Terminalia (without cerci), lateral view. 127. Epandrium, cerci and surstylus, lateral view. 128–131. Oxysarcodexia fringidea (Curran & Walley) (Colombia, Amazonas, NRM, except Fig. 130 (Colombia, Amazonas, NMR). 128. Habitus, lateral view. 129. Terminalia, lateral view. 130. Distiphallus, anterior view. 131. Terminalia, posterior view.