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

Dexosarcophaga ( Bezzisca) tracua View in CoL sp. nov.

( Figs. 8–16 View FIGURES 8 – 14 View FIGURES 15 – 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 View FIGURES 8 – 14 ).

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