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 brasiliensis sp. nov ( Figs 33–46 ) Diagnosis. Yellow species; descendant plate of the anterior cercus subtriangular in posterior view ( Fig. 38 ); phallus narrow, widening toward the apex, with large dorsal subapical appendix ( Fig. 40 ); bacilliform sclerite folded and shorter than subepandrial sclerite ( Fig. 39 ); genital fork with arms longer than base ( Figs 44, 46 ); tergite 10 undivided ( Fig. 45 ). FIGURES 33–41 . Opeatocerata brasiliensis sp. nov. , holotype ♂. 33 . habitus , lateral view; 34 . wing; 25 . abdomen from tergite 2 to terminalia; 36 . terminalia, lateral view; 37 . lobes of cerci, dorsal view; 38 . descendant plate of anterior cercus and hypropoct, posterior view; 39 . subepandrial sclerite and bacilliform sclerite, dorsal view; 40 . ejaculatory apodeme, phallus and hypandrium, lateral view; 41 . hypandrium, ventral view. FIGURES 42–46 . Opeatocerata brasiliensis sp. nov. , paratype ♀. 42 . habitus , lateral view; 43 . wing; 44 . tergite 8, dorsal view; sternite 8 and genital fork, ventral view; 45 . tergite 10, dorsal view; sternite 10, ventral view; 46 . abdomen from tergite 5 to terminalia, dorsal view. Description . Male ( Fig. 33 ). Head : Face parallel-sided, 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 2.5X longer than postpedicel. Proboscis yellow shorter than head height. Thorax yellow, shiny ( Fig. 33 ). Legs yellow, except for hind femur and tibia with apical black ring and all tarsomeres 4–5 black; hind tibia with anterodorsal and posterodorsal and anteroventral rows of longer bristles. Wing ( Fig. 34 ) hyaline; pterostigma brown, conspicuous, about 2.8X longer than wide. Halter yellow. Abdomen yellow, shiny ( Figs 33, 35 ); tergite 8 divided in two subrectangular plates; sternite 8 divided in two trapezoidal plates. Terminalia : Anterior cercus with proclinate dorsal projection in lateral view ( Fig. 36 ), posterior margin with median sinus in dorsal view ( Fig. 37 ); descendant plate subtriangular in posterior view ( Fig. 38 ). Posterior cercus with rounded apex in lateral view ( Figs 35, 36 ), with pointed dorsal subbasal projection in dorsal view ( Fig. 37 ). Hypoproct subtrapezoidal in lateral view ( Fig. 36 ) and covering inner surface of the posterior cercus in posterior view ( Fig. 38 ). Epandrial ventral lobe rounded at apex ( Fig. 36 ), with spiniform bristles mesially and longer bristles at base ( Fig. 36 ). Hypandrium longer than wide, with concave apex ( Fig. 41 ), without long bristles. Phallus narrow, widening toward the apex, longer than hypandrium, with large dorsal subapical appendix ( Fig. 40 ). Subepandrial sclerite longer than wide, U-shaped ( Fig. 39 ). Bacilliform sclerite folded and shorter than subepandrial sclerite ( Fig. 39 ). Specimen length : 3.6 mm ; wing length : 3.6 mm . Female ( Fig. 42 ). Similar to male, except frons brown, shiny, wider than face. Wing with pterostigma about 2.9X longer than wide ( Fig. 43 ). Terminalia: Tergite 8 subrectangular ( Fig. 44 ). Sternite 8 with base wider, concave and apex rounded ( Fig. 44 ). Genital fork wider than long and arms longer than base, separated at apex ( Figs 44, 46 ). Tergite 10 undivided, with half the length of tergite 8 ( Fig. 45 ). Sternite 10 with base straight and apex bilobed ( Fig. 45 ). Specimen length : 3.3 mm , wing length : 3.3 mm . Geographical distribution . Brazil (Goiás, Mato Grosso and Pará) ( Fig. 211 ). Type material . HOLOTYPE ♂, labelled: Brasil , Mato Grosso, Chapada Guimarães, 22–30.xi.1983 . J.E. Bindá / armadilha malaise ( INPA ). Paratypes : Brazil , Mato Grosso . Same data ( 2 ♂ , 4 ♀, INPA ). Pará . Marabá, S. Norte. ix.1982 . Michael Miles ( 1 ♂ , MPEG ). Est[ado] de Goiás . Corumbá, F[azenda]. Monjolinho. Barreto col. ( 1 ♂ , MZUSP ). Holotype condition . Right wing on microslide; abdomen in microtube with glycerin. Etymology . The specific epithet refers to the country “ Brazil ” where the specimens were collected. Remarks . Opeatocerata brasiliensis sp. nov. differs from other species by the descendant plate of anterior cercus subtriangular in posterior view ( Fig. 38 ) (in other species, the plate is subtrapezoidal, subrectangular, hourglass-shaped or with lateroventral projection), subepandrial sclerite longer than wide, ( Fig. 39 ) (in other species it is wider than long or as wide as long) and hypoproct subtrapezoidal in lateral view ( Fig. 36 ) (rounded, bacilliform or subtriangular in other species).