Opeatocerata ampullaria, 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 : 508-510

Opeatocerata ampullaria sp. nov.

( Figs 17–25)

Diagnosis. Yellow species; descendant plate of the anterior cercus hourglass-shaped in posterior view ( Fig. 22); phallus with narrow base, wider at mostly, with large dorsal subapical appendix ( Fig. 24).

Description. Male ( Fig. 17). Head: Face of sides slightly diverging toward the proboscis, brown with gray pruinescence visible in ventral view, about 5 X longer than lower width. Ocellar tubercle protruberant, brown with brown pruinescence; ocelli yellow. Antenna yellow with black bristles; postpedicel about 2 X longer than pedicel; stylus about 2 X longer than postpedicel. Proboscis yellow shorter than head height. Thorax yellow, shiny ( Fig. 17). Legs yellow, except brown apical ring on hind femur and all tarsomeres 4–5 brown; hind tibia and tarsus with anterodorsal and posterodorsal rows of longer bristles. Wing ( Fig. 18) hyaline; pterostigma brown, conspicuous, about 2.8 X longer than wide. Halter pale yellow. Abdomen yellow, shiny ( Figs 17, 19); tergite 8 divided in two subrectangular plates; sternite 8 divided in two subrectangular plates. Terminalia: Anterior cercus with proclinate dorsal projection in lateral view ( Fig. 20), concave in dorsal view ( Fig. 21); descendant plate hourglass-shaped in posterior view ( Fig. 22). Posterior cercus with acuminate apex in lateral view ( Fig. 20), without dorsal projections ( Fig. 21). Hypoproct subtriangular in lateral view ( Fig. 13) and comma-shaped in posterior view ( Fig. 22). Epandrial ventral lobe slightly bilobed at apex ( Fig. 20); spiniform bristles mesially on dorsal lobe and longer bristles apically on ventral lobe ( Fig. 20). Hypandrium longer than wide, with rounded apex and median sinus ( Fig. 25), without long bristles. Phallus with narrow base, wider at mostly, longer than hypandrium with large dorsal subapical appendix ( Fig. 24). Subepandrial sclerite wider than long, U-shaped ( Fig. 23). Bacilliform sclerite folded and longer than the subepandrial sclerite ( Fig. 23). Specimen length: 3.3 mm, wing length: 3.9 mm. Female. Unknown.

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

Type material. HOLOTYPE ♂, labelled: Brasil, Amazonas, Manaus, C[ampus] Univers[itário] v. 1979. J.A. Rafael / Armadilha de Malaise ( INPA). Paratypes: Brazil, Amazonas. Manaus, PDBFF /WWF. Proj[eto] Bert Klein / x. 1985, Malaise / Reserva 1301 (6 ♂, INPA). Idem, Reserva 1210 (1 ♂, MPEG). Manaus, C[ampus] Univ[ersitário]. iii. 1979, J.A. Rafael (1 ♂, MZUSP). Idem, v. 1979, J.A. Rafael (1 ♂, INPA) / Malaise. Idem, vi. 1979, J.A. Rafael (1 ♂, INPA). Idem, vii. 1979, J.A. Rafael (1 ♂, MPEG). Manaus, F[azenda] Esteio, BR– 174, Km 41 ZF- 3 / 24–27.viii. 1993. F. Xavier (2 ♂, MZUSP). Manaus, R[eserva] Ducke. 16–17.iii. 1993. Varredura em mata. João Vidal (1 ♂, INPA). Idem, 29.v. 1990. Malaise. Vidal-Rocha (1 ♂, INPA). Manaus, BR 174 ZF- 6, Km 41 / 04– 12.ix. 1991. Francisco Xavier (1 ♂, INPA).

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

Etymology. From the Latin ampulla, in reference to the hourglass-shaped descendant plate of the anterior cercus.

Variation. Body length range: 3.2–4.1 mm. Some paratypes with brown postpedicel and stylus.

Remarks. Opeatocerata ampullaria sp. nov. differs from other species by the descendant plate of anterior cercus hourglass-shaped in posterior view ( Fig. 22), which is subrectangular, subtriangular or with latero-ventral projection in other species.