Dexosarcophaga (Bezzisca) tracua, Filho, Fernando Da Silva Carvalho & Esposito, Maria Cristina, 2011

Filho, Fernando Da Silva Carvalho & Esposito, Maria Cristina, 2011, Panava a senior synonym of Wulpisca, and description of new species of Panava and Dexosarcophaga (Bezzisca) from the Brazilian Amazon (Diptera, Sarcophagidae), Zootaxa 2808, pp. 49-56 : 53-55

Dexosarcophaga (Bezzisca) tracua sp. nov.

( Figs. 8–16 )

Holotype. Male: “ Brasil Pará/ Bragança/ TRACUATEUA/ 2–4. xi.1990 ”; “Armadilha/ 1,6m / suspensa [= suspended trap]”; “ Brasil Pará/ I.S. Gorayeb [collector]”

Male. Head. Parafacial and fronto-orbital plate with golden microtomentum; parafacial plate with fine setae all along eye margin. Frontal vitta black; frontal row with six bristles; one reclinate bristle; outer vertical bristle fairly differentiated from postocular setae; inner vertical bristle slightly converging, about 2 x as long as frontal bristle. Gena and postgena with golden microtomentum, with black setae. Antenna light brown, covered with whitish microtomentum; first flagellomere about 2.5 x as long as pedicel; arista long plumose in basal two-thirds. Palpus and proboscis brown.

Thorax. Black with silvery grey microtomentum. Chaetotaxy: acrostichals = 0+1, dorsocentrals = 2+3, intraalars = 1+2, supra-alars = 1+3, postpronotals = 2, postalars = 2, notopleurals = 2; scutellum with 2 developed laterals, a pair of fine discals and no apicals; meropleurals = 4, katepisternals = 3, anepisternals = 5, proepimeron = 2, proepisternal = 2. Wing hyaline, vein R1 setulose in basal two-thirds, R4+5 setulose almost to crossvein r-m, stem of vein R2+3 setulose. Legs black; mid femur with two median posterior bristles, two preapical posterodorsal bristles and a row of four anterodorsal spines (ctenidium); mid tibia with one anterodorsal and one anteroventral bristle in distal half and two median posterodordal bristles; hind femur with a row of anterodorsal bristles and one anteroventral apical bristle; hind tibia with two anterodorsal and two posterodorsal bristles and one anteroventral preapical bristle.

Abdomen. Black with silvery grey microtomentum forming the usual tessellate pattern; tergite 4 and 5 each with a row of marginal bristles. Sternite 5 V-shaped, with arms long and slender and with minute setae in posterior region; inner margin of arms with a membranous and swollen region, wholly covered with setulae and with some setae ( Fig. 10 ).

Terminalia. Syntergosternite 7+8, epandrium and cercus blackish brown. Epandrium with scattered dorsal setae ( Fig. 8 ). Cercus almost straight with apex slightly bent posteriorly and pointed in profile ( Fig. 8 ); cercal apices in posterior view narrowly separated ( Fig. 9 ). Surstylus almost triangular, with rounded anterior margin, and scattered setae on apex and along posterior margin ( Fig. 8 ). Pregonite with enlarged median region and a narrow and pointed apex ( Fig. 14 ). Postgonite claw-like, shorter than pregonite, with slightly curved apex and a strong bristle on anterior margin ( Fig. 13 ). Phallus with distinct basi- and distiphallus; basiphallus posteriorly with a pair of longitudinal keels, each with a serration of teeth-like structures scattered along each keel in the distal half ( Fig. 12 ); distiphallus with narrow base and enlarged apex, enlarged portion with a membranous region between base and apex ( Figs. 11 , 16 ); anterior projection of ditiphallus partially membranous and with minute spines; juxta small, partially covered laterally by apical margin of distiphallus ( Figs. 15, 16 ), divided into two apophyses (ventral view) that are curved distally ( Fig. 15 ); median stylus with an enlarged base, and a narrow spinose tip ( Fig. 15 ); lateral styli with an elongated base coiling toward the distiphallus base and with a few cuticular spines at tip ( Fig. 15 ); vesica with straight base and enlarged apex covered by two spinose membranous lobes ( Figs. 15, 16 ).

Length: 3.1 mm.

Female. Unknown.

Etymology. The specific designation “ tracua ” refers to the type locality of Tracuateua, Brazil, whose name is derived from two indigenous Tupi (an ancient Indian language) words, tracuá = ant and teuá = land. The specific epithet thus also alludes to the association of Dexosarcophaga with ant nests.

Distribution. NEOTROPICAL – Brazil (Pará).

Remarks. Dexosarcophaga (Bezzisca) tracua runs to D. (B.) bermudezi in the most recent published key to Bezzisca species ( Silva & Mello-Patiu 2010), but differs from D. (B.) bermudezi in having basiphallus with a pair of posterior serrated keels, lobes of vesica spinose, and fifth sternite with long arms. Dexosarcophaga (B.) bermudezi has the posterior basiphallic keels smooth; membranous lobes of vesica without spines, and fifth sternite with posterior margin almost straight, without arms ( Silva & Mello-Patiu 2010). Dexosarcophaga (B.) tracua is similar to D. (B.) ampullula in that they share a serrated basiphallus. However, D. (B.) tracua differs from D. (B.) ampullula in having the basiphallus with two posterior longitudinal keels, vesica with apical membranous lobe, and the anterior part of pregonite without apophyses. Dexosarcophaga (B.) ampullula has the basiphallus with one posterior longitudinal keel, vesica with membranous lobes on the upper surface, and the anterior part of pregonite with two apophyses ( Lopes 1974; Silva & Mello-Patiu 2010).

Figures

FIGURES 8 – 14. Dexosarcophaga tracua sp. nov., male terminalia. 8. Epandrium, surstylus, and cercus, lateral view. 9. Cercus, posterior view. 10. Sternite 5, ventral view. 11. Phallus and associated structures, lateral view. 12. Basiphallus, laterodorsal view. 13. Postgonite, lateral view. 14. Pregonite, lateral view. Scale bar = 0.2 mm. Abbreviations: bp = basiphallus, dp = distiphallus, prg = pregonite, ptg = postgonite.

FIGURES 15 – 16. Dexosarcophaga tracua sp. nov., male terminalia. 15. Distiphallus, ventral view. 16. Distiphallus, ventral view. Scale bar = 0.1 mm. Abbreviations: ju = juxta, ls = lateral stylus, ms = median stylus, ve = vesica.