Opeatocerata cylindrophalllus, 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 : 519-521

Opeatocerata cylindrophalllus sp. nov.

( Figs 80–89)

Diagnosis. Yellow species; sternite 8 undivided ( Fig. 83); phallus subcylindrical, narrower apically, with ventral subapical narrow appendix ( Fig. 88) and subapical expansion laterally, more conspicuous ventrally ( Fig. 89).

Description. Male ( Fig. 80). Head: Face with sides slightly diverging toward the proboscis, brown with gray pruinescence visible in ventral view, about 4 X longer than lower width. Ocellar tubercle protuberant, brown with brown pruinescence; ocelli yellow. Antenna yellow with black bristles; postpedicel about 1.5 X longer than pedicel; stylus about 2 X longer than postpedicel. Proboscis yellow shorter than head height. Thorax yellow, shiny ( Fig. 80). Legs yellow, except for hind femur with black apical ring and all tarsomeres 4–5 brown, hind tibia and tarsus with anterodorsal and posterodorsal rows of longer bristles. Wing hyaline, pterostigma brown, conspicuous, about 2.2 X longer than wide ( Fig. 81). Halter yellow. Abdomen yellow, shiny ( Figs 80, 82); tergite 8 divided in two subrectangular plates; sternite 8 undivided ( Fig. 83). Terminalia: Anterior cercus with proclinate dorsal projection in lateral view ( Figs 82, 84), posterior margin with median sinus in dorsal view ( Fig. 85); descendant plate subrectangular and lower margin slightly convex in posterior view ( Fig. 86). Posterior cercus with acuminate apex in lateral view ( Figs 82, 84); without dorsal projections ( Fig. 85). Hypoproct rounded in lateral view and covering mesially the posterior cercus in posterior view ( Fig. 84). Epandrial ventral lobe rounded at apex ( Fig. 84), with spiniform bristles mesially and longer bristles apically. Hypandrium wider than long, with concave apex ( Fig. 89), without long bristles. Phallus subcylindrical, narrower apically, longer than hypandrium, with ventral subapical narrow appendix ( Fig. 88) with lateral and subapical expansions, more conspicuous ventrally ( Fig. 89). Subepandrial sclerite wider than long, V-shaped ( Fig. 87). Bacilliform sclerite without folds and longer than subepandrial sclerite ( Fig. 87). Specimen length: 2.7 mm wing length: 2.9 mm. Female. Unknown.

Geographical distribution. Brazil (Mato Grosso) ( Fig. 211).

Type material. HOLOTYPE ♂, labelled: Brasil, Mato Grosso, Cáceres. xi. 1984. Malaise. C. Elias ( INPA).

Holotype condition. Left wing on microslide; abdomen in microtube with glycerin.

Etymology. From the Greek kylindros (cylindrical) and phallos (phallus), referring to the cylindrical-shaped phallus.

Remarks. Opeatocerata cylindrophallus sp. nov. differs from other species of the genus by the undivided sternite 8 ( Fig. 83) (sternite 8 is divided into two plates in other species) and phallus with subapical expansion laterally, more conspicuous ventrally ( Fig. 89) (phallus without lateral subapical expansion in other species).