Ommatius trifidus Vieira, Bravo & Rafael

Vieira, Rodrigo, Bravo, Freddy & Rafael, José Albertino, 2010, Ommatius Wiedemann, 1821, normus species-group (Diptera, Asilidae): description of two new species and comments on Brazilian species, Zootaxa 2344, pp. 39-51 : 47-49

Ommatius trifidus Vieira, Bravo & Rafael sp. nov.

( Figs. 41–47 )

Male. Head. Antenna brown; 2 ocellar setae; vertex black, golden tomentose; face golden tomentose; face with 10 brown mystacal macrosetae; frons brown; palpus brownish setose; proboscis dark brown with white and yellowish setae ventrally; labial setae yellow-brown; occiput black-gray tomentose; occipital setae whitish and yellowish; 5 postocular macrosetae.

Thorax. Mesonotum black; one portion of the scutellum golden-grayish tomentose; sutural spot, prescutellar spot and postalar spot golden-grayish; pleuron black, gray tomentose. Macrosetae/setae thorax: antepronotum with 4 yellow macrosetae; 2 notopleural macrosetae; 2 supralar macrosetae (1 thick and long, the other thinner and 2/3 as long as first); 2 postalar macrosetae (1 thin and 1/2 as long as other); 6 pairs of long dorsocentral macrosetae; discal scutellar setae yellowish; 2 black apical scutellar macrosetae; metanepisternal and katatergal macrosetae yellowish.

Wing. Wing without costal dilation; crossvein r-m at middle of cell d; R4+5 at apex of cell d. Halter yellow.

Legs. Hind femur swollen; fore and middle femora brown anteriorly and yellowish posteriorly and ventrally; hind femur with basal 1/2 yellow to yellow-brown and apical 1/2 brown; fore tibia yellowish; middle tibia mostly yellowish with narrow apex brown; hind tibia with basal 1/2 yellowish and apical 1/2 brownish; fore and middle tarsi with basal 2/3 of first tarsomere yellowish, apical 1/3 brownish; hind tarsus with first tarsomere brownish. Macrosetae/setae legs: hind trochanter yellow setose; fore femur yellow setose ventrally; middle femur with preapical posterodorsal seta brown and only yellow setae ventrally; hind femur with 2 anterior macrosetae and 1 anterodorsal black, 7–8 macrosetae anteroventrally, 1 basal and 1 apical macroseta posteroventrally; hind tibia with apical spur-like macroseta; right fore tarsus with 1 yellow macroseta.

Abdomen. Tergites and sternites dark brown.

Terminalia ( Figs. 41–47 ). Yellow-brown to brownish. Cercus truncate ( Fig. 42 ); epandrium with 3 teeth in ventral view ( Fig. 43 ); hypandrium with triangular posterior margin ( Fig. 43 ); median portion of gonocoxite with macrosetae ( Fig. 43 ); medioapical portion of subepandrial sclerite with setae ( Fig. 44 ); ejaculatory apodeme with basal 1/3 moderately wide and apical 2/3 narrow in lateral view ( Fig. 45 ); phallus with anterodorsal portion slightly sclerotized ( Figs. 45, 47 ). Ventral margin of phallus with 1 pointed projection basally, 1 median rounded projection, and preapical projection curved back in lateral view ( Fig. 45 ). Phallus 3.7 times longer than greatest width of ejaculatory apodeme in lateral view ( Fig. 45 ); basal portion of gonostylus truncate, apex prominent ( Fig. 46 ). Gonostylus 3.1 times longer than its greatest width in lateral view ( Fig. 46 ).

Size. Body length 11.4 mm; wing length 8.5 mm.

Holotype condition. Right apical scutellar macroseta lost; 1 right dorsocentral macroseta and right middle leg lost.

Female. Unknown.

Variation. The following variation was observed in the paratype specimens: 7–8 brown mystacal macrosetae; 6 postocular macrosetae; postalar spot golden; 1–3 supralar macrosetae; pleura brown-reddish sparsely gray tomentose; crossvein r-m slightly beyond the middle of cell d; stem of halter yellow to brown; ventral portion of middle femur with 1 black seta ventrally; hind femur posteroventrally with 2 apical macrosetae; first tarsomere on middle tarsus brown, black on hind tarsus; body length 10.3–13.2 mm, wing 8– 8.9 mm.

Etymology. The name trifidus refers to the apex of epandrium.

Geographical records. Brazil: Pará State and Bahia State.

Type material examined. Holotype: Pará, Bujaru, 12.v.1978 / BRASIL, Pará, I.S. Gorayeb [Collector] / Holótipo Ommatius trifidus Vieira, Bravo & Rafael (3 MPEG).

Paratypes: BRASIL, Pará, Belém, MPEG-CAMPUS, 21.vi.1993, L. Costa [Collector] (1 3 MPEG); BRASIL, Pará, Tucuruí, Rio Tocantins, Marg.[em] Direita Canoal, 26–28.iii.1984 / Armadilha Suspensa / Brasil, Pará, T. Pimentel (1 3 MPEG); Bôa {Boa}, Vista, Mu.[nicípio] Castanhal, 3.iii.1964 / BRASIL, PA[rá], W. França Col. (1 3 MZUSP); [Rodovia] Belém-Brasília, Km 90, F.S. Antonio, 30.vii.1972 / BRASIL, PA[rá], M. Helana Col. (1 3 MZUSP); BRASIL, Bahia, Seabra, 11–13.i.2008. Leg Alvim, E. / Armadilha Luminosa / MZUEFS# 38363 (1 3 MZUEFS); BRASIL, [Bahia], Barreiras, APA Rio de Janeiro, 05.iv.2008, Bravo, F., Menezes, E., Alvim, E., Silva-Neto, A. [Collectors] / MZUEFS #39217 (1 3 MZUEFS).

Figures

FIGURES 41 – 47. Ommatius trifidus sp. nov. Holotype 3: 41. Male terminalia lateral. 42. Male terminalia dorsal. 43. Male terminalia ventral. 44. Subepandrial sclerite. 45. Phallus and ejaculatory apodeme in lateral view. 46. Gonostylus. 47. Phallus and ejaculatory apodeme in dorsal view.