Oxysarcodexia bicolor Lopes, 1946

Mariluis, Pablo Ricardo Mulieri Juan Carlos & Patitucci, Luciano Damián, 2010, Review of the Sarcophaginae (Diptera: Sarcophagidae) of Buenos Aires Province (Argentina), with a key and description of a new species, Zootaxa 2575, pp. 1-37 : 20

Oxysarcodexia bicolor Lopes, 1946

( Figs. 12 , 14 , 24 )

Oxysarcodexia bicolor Lopes, 1946a: 127 .

Description of female. Body length = 7.3–8.5 mm. Head. Head length at antennal base 1.16–1.05 head length at vibrissal level. Microtomentum of parafacial and fronto-orbital plate, gena, and postorbital areas distinctly golden. Genal and postcranial setae black. Antenna black, first flagellomere black with dark microtomentum, length 0.29–0.33 head height, arista plumose. The females differ from males by the possession of wider front (0.28–0.30 of head width), two pairs of proclinate fronto-orbital bristles, the anterior bristle smaller (0.50x) than the posterior one. Thorax. Postpronotal lobe, notopleuron anepimeron, anepisternum and median stripes of scutum with yellowish golden microtomentum. Katepisternum with silvery microtomentum. Proanepisternum bare. Chaetotaxy: acrostichals 5–4 (small)+1 (prescutellar), dorsocentrals 4+5 (two posterior pairs larger), intra-alars 2+2, supra-alars 2+3, anterior postpronotal 1, basal postpronotal 2, postalars 2, notopleurals 4 (two big and two small), katepisternals 4 (usually the two median smaller). Scutellum with basal and lateral pairs, apical absent, discals one pair. Wing hyaline, tegula black, yellow-orange basicosta and veins, R1 bare, R4+5 setulose in proximal 0.67 or less of distance to crossvein r-m, costal spine not differentiated, third costal sector without ventral setae, lower calypteres pale brown. Legs black; middle femur without posteroventral ctenidium on its apical portion. Abdomen. Tergites with spots of gray microtomentum. Tergites 1+2, 3, and 4 without erect marginal setae. Tergite 5 with a complete row (five pairs) of erect marginal setae. Terminalia. Tergite 6 entire and mostly reddish, covered with dense golden microtomentum, and sparse black hairs on dorsal and central areas. Tergite 8 absent. Sternite 6 and 7+8 reddish with golden microtomentum, having a broad concave apical area ( Figs.12 , 24 ).

Distribution: Neotropical – Argentina (Buenos Aires), Brazil (Rio de Janeiro, São Paulo).

Material studied: Buenos Aires: 1 ɗ El Carretero, Pdo. Magdalena, 30.XI.2000 on Scutia buxifolia, Torretta leg. ( FAUBA); 1 Ψ Isla A (no date) ( ANLIS); 1 ɗ Campana, Campana, III.2003 Mariluis leg.; 2 ɗ, 5 Ψ Reserva Ecológica Costanera Sur, Ciud. Aut. Buenos Aires, 31.III.2004 Mariluis leg. ( ANLIS); 1 ɗ Ministro Rivadavia, Alte. Brown, V.2005 on faeces Mulieri leg. ( ANLIS).

Remarks: The specimens examined agree with the original description given by Lopes (1946a) based on the male type material. Females were studied by Tibana & Mello (1985) who grouped O. bicolo r with those co-generic species having the so-called “Syntergite 6+7” (here tergite 6) entirely sclerotized as a single plate, and with the absence of tergite 8. Otherwise not illustrated or described. Male terminalia were illustrated by Lopes (1946a).

Biology: Mulieri et al. (2008) commented on the strong association of this species with woodlands on the coastline of Río de la Plata, Buenos Aires. We captured this species on faeces. Flower visitor of Rhamnaceae ( Scutia buxifolia ).

Figures

FIGURES 8 – 13. Female terminalia, postero-ventral view. 8. Oxysarcodexia varia. 9. O. terminalis. 10. O. marina. 11. O. paulistanensis. 12. O. bicolor. 13. Sarcophaga (Lipoptilocnema) koehleri.

FIGURES 14 – 16. Thorax. 14. Oxysarcodexia bicolor, left lateral view. 15. O. culmiforceps, left lateral view. 16. Sarcophaga (Lipoptilocnema) koehleri, dorsal view.

FIGURES 22 – 25. 22. Oxysarcodexia marina, female abdominal ST 7 + 8. 23. O. paulistanensis, female abdominal ST 7 + 8. 24. O. bicolor, female abdominal ST 7 + 8. 25. Sarcophaga (Lipoptilocnema) koehleri, female abdominal ST 6 and ST 7. Scale bars = 0.20 mm. The arrows show the concavity of the sternites. Abbreviation: ST, sternite.