Revision of Opeatocerata Melander, 1928 (Diptera: Empididae: Empidinae) Author Câmara, J. T. Author Rafael, J. A. text Zootaxa 2014 3846 4 502 546 journal article 10.11646/zootaxa.3846.4.2 ea136b1c-dc96-4c41-b078-01ca553453a0 1175-5326 252519 71A80CC3-CDC1-4291-863B-FA7501D60AF5 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 4X longer than lower width. Ocellar tubercle protuberant, brown with brown pruinescence; ocelli yellow. Antenna yellow with black bristles; postpedicel about 1.5X longer than pedicel; stylus about 2X 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 2.2X 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. FIGURES 80–89 . Opeatocerata cylindrophallus sp. nov. , holotype ♂. 80 . habitus , lateral view; 81 . wing apex; 82 . abdomen from tergite 4 to terminalia, lateral view; 83 . sternite 8, ventral view; 84 . terminalia, lateral view; 85 . lobes of cerci, dorsal view; 86 . descendant plate of anterior cercus, posterior view; 87 . subepandrial sclerite and bacilliform sclerite, dorsal view; 88 . ejaculatory apodeme, phallus and hypandrium, lateral view; 89 . phallus and hypandrium, ventral view. 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).