Opeatocerata chaetohypandrialis, Câmara, J. T. & Rafael, J. A., 2014

Câmara, J. T. & Rafael, J. A., 2014, Revision of Opeatocerata Melander, 1928 (Diptera: Empididae: Empidinae), Zootaxa 3846 (4), pp. 502-546 : 514

Opeatocerata chaetohypandrialis sp. nov.

( Figs 47–57)

Diagnosis. Tergites 3–6 with basal subrectangular and apical transversal brown spots ( Fig. 50); hypandium with long bristles at apex ( Fig. 57); phallus with large dorsal subapical appendix in lateral view ( Fig. 55) and spiniform projections laterally, best visualized in ventral view ( Fig. 56).

Description. Male ( Fig. 47). Head: Face parallel-sided, dark brown with gray pruinescence visible in ventral view, about 4 X longer than lower width. Ocellar tubercle protuberant, dark brown with gray puinescence; ocelli yellow. Scape and pedicel yellow with yellow bristles; postpedicel brown about 2 X longer than pedicel; stylus about 2 X longer than postpedicel. Proboscis yellow shorter than head height. Thorax yellow, shiny ( Fig. 47). Legs yellow, except for hind femur and tibia with black apical ring and all tarsomeres 4–5 black; hind tibia and tarsus with anterodorsal and posterodorsal rows of longer bristles. Wing ( Fig. 48) hyaline, pterostigma brown, conspicuous, about 2.5 X longer than wide. Halter yellow. Abdomen yellow, shiny; tergites 3–6 with basal subrectangular and apical transversal brown spots ( Figs 49, 50); tergite 8 divided in two subrectangular plates; sternite 8 divided in two trapezoidal plates. Terminalia: Anterior cercus with a reclinate dorsal projection in lateral view ( Figs 49, 51), subrectangular in dorsal view ( Fig. 52); descendant plate subtrapezoidal in posterior view ( Fig. 53). Posterior cercus with rounded apex in lateral view ( Figs 49, 51); without dorsal projections ( Fig. 52). Hypoproct suboval in lateral view ( Fig. 51) and comma-shaped in posterior view ( Fig. 53). Epandrial with bilobate ventral lobe ( Figs 49, 51); spiniform bristles mesially on dorsal lobe and longer bristles apically on ventral lobe ( Fig. 51). Hypandrium longer than wide, with truncate apex and median sinus, with long bristles at apex ( Fig. 57). Phallus with narrower base, extending towards the apex, longer than hypandrium, with a larger dorsal subapical appendix in lateral view ( Fig. 55) and spiniform projections laterally in ventral view ( Fig. 56). Subepandrial sclerite wider than long, V-shaped ( Fig. 54). Bacilliform sclerite without folds and longer than subepandrial sclerite ( Fig. 54). Specimen length: 3.5 mm; wing: 4.2 mm. Female. Unknown.

Geographical distribution. Brazil (Pará) ( Fig. 211).

Type material. HOLOTYPE ♂, labelled: Brasil, Pará, Santo A[ntonio] de Tauá. 07.iv. 1975. I.S. Gorayeb ( MPEG). Paratypes: same data as holotype (2 ♂, INPA; 1 ♂, MPEG).

Holotype condition. Good; wing mounted in microslide; abdomen in microtube with glycerin.

Etymology. From the Greek chaeto (bristles), referring to the bristles present on the hypandrium.

Remarks. Opeatocerata chaetohypandrialis sp. nov. differs from other species by the following characters: tergites 3–6 with basal subrectangular and apical transversal brown spots ( Fig. 50) (other species have paramedian spots on the tergites); hypandrium with bristles at apex ( Fig. 57) (other species without bristles on the hypandium); phallus with spiniform projections laterally ( Fig. 56) (in other species without spiniform projections laterally).