Oxysarcodexia marina ( Hall, 1938 )

Souza, Carina Mara De, Pape, Thomas & Thyssen, Patricia Jacqueline, 2020, Oxysarcodexia Townsend, 1917 (Diptera: Sarcophagidae) - a centennial conspectus, Zootaxa 4841 (1), pp. 1-126 : 73

Oxysarcodexia marina ( Hall, 1938)

( Figs 173–175 )

Apelophyla marina Hall, 1938: 257 ; Argentina, Mendoza. Holotype male and one male paratype in DEI, two male paratypes in NMW, one male paratype in USNM, and two male paratypes “in the author’s collection” (none examined).

Diagnosis. Male. Length 9.0 mm. Postocular plate with golden pollinosity. Ocellar bristles well developed. Thorax and abdomen with silvery pollinosity. Three well-differentiated post-sutural dorsocentral bristles. Apical scutellar bristles absent. Legs blackish. T4 with one pair of small median marginal bristles. ST5 with deep median cleft with margins almost parallel. Syntergosternite 7+8 black. Cercus bent backwards, with expanded obliquely cut apex. Cercus with bristles ventrally over full length. Cerci with distal third narrower than middle part and with a distinct dilation at middle in posterior view; diverging, with cercal prongs slightly convergent. Pregonite and postgonite both with expanded base, gradually narrowing to apex; unicolorous. Distiphallus with smooth ventroapical margin, lateral lobes, large dorsoapical swelling, square/oblong apex, straight dorsal outline and lateroapical expansions. Vesica symmetrical, with lateral lobes; distal lobes well developed, squared, sclerotized, with elongate ventroapical area and spines along margins (not continuous).

Remarks. Male morphology and coloration of O. marina are similar to those of O. paulistanensis , but O. marina has a black syntergosternite 7+8 and lacks apical scutellar bristles ( Mulieri et al. 2010). Oxysarcodexia marina also presents peculiarities in the terminalia, particularly in the strongly diverging cerci, each cercus being horseshoe-shaped in posterior view with a distinct dilation at middle ( Fig. 175 ). The distiphallus has a characteristic ventroapically elongate vesica ( Fig. 174 ). See also remarks under O. augusta . Mulieri et al. (2010) described the female in detail, showing that the sternites resemble those of O. varia . According to the description by Mulieri et al. (2010) and the classification proposed by Tibana & Mello (1985), we consider O. marina as belonging to the group with T7 divided into two plates.

Distribution. NEOTROPICAL. Argentina (Buenos Aires, Mendoza), Brazil * (Rio Grande do Sul *).

Biology. This species has been collected from rotten bovine liver, dog feces and in organic rice fields ( Mariluis et al. 2007; Mulieri et al. 2008, 2010, 2011; Acosta et al. 2017). In Buenos Aires, Argentina, O. marina has been collected in grasslands and rural areas ( Mulieri et al. 2008, 2011). Adults of this fly are flower visitors of water primroses ( Ludwigia spp., Onagraceae ) ( Mulieri et al. 2010).

Material examined. [ ♂] Pelotas 7 Maio 1963 R. G. do Sul—Brasil C. M. Biezanko leg. / Apelophyla marina ♂ Hall Det. H. S. Lopes [ MNRJ] // [♂] Pelotas 7 Maio 1963 R. G. do Sul—Brasil C. M. Biezanko leg. / Apelophyla ♂ marina Hall Det. H. S. Lopes / MNRJ 520 [typed vertically on left side of label] [ MNRJ] // [♂] Brasil, RJ, Viamão APA Refúgio de vida silv. Banhado dos Pachecos 14.V.2011 —malaise / D1B / Oxysarcodexia marina [no italics] Det: P. Mulieri [ MNRJ] // [♂] BRASIL, Rio Grande do Sul, Viamão 5.XI.2012 Simões, P. col. / Oxysarcodexia marina (Hall) ♂ Det. CA Mello-Patiu [ MNRJ] .

Figures

FIGURES 173–181. Oxysarcodexia spp., males. 173–175. Oxysarcodexia marina (Hall) (Argentina, MACN). 173. Habitus, lateral view. 174. Terminalia, lateral view. 175. Terminalia, posterior view. 176–178. Oxysarcodexia meridionalis (Engel) (Brazil, São Paulo, Campinas, LIE). 170. Habitus, lateral view. 171. Terminalia, lateral view. 172. Terminalia, posterior view. 179–181. Oxysarcodexia mineirensis Souza & Paseto, holotype (Brazil, Minas Gerais, Uberlândia, MNRJ). 179. Habitus, lateral view. 180. Terminalia, lateral view. 181. Terminalia, posterior view. Figs 173–175 by P.R. Mulieri (MACN).