A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea) Author Whitworth, Terry L. Author Yusseff-Vanegas, Sohath text Zootaxa 2019 2019-08-26 4659 1 1 146 journal article 25918 10.11646/zootaxa.4659.1.1 0cbe0b8e-2019-4f5a-8336-2d4d9fcd8bf6 1175-5326 3377239 57309E14-0330-4ED7-BCDA-355EE6618215 Key to separate Mesembrinellidae from Neotropical Calliphoridae 1 Posterior thoracic spiracle large, reniform, with opening on upper margin and a fringe of long setae ( Fig. 7 ); anterior spiracle small and usually ovate (droplet-shaped), with a more or less broad oval opening above ( Fig. 5 ) or, rarely, with a long, narrow opening gradually widening above ( Fig. 6 ); subscutellum usually from weakly to moderately or (rarely) prominently developed; body color often somewhat testaceous (yellowish or reddish brown), as in Fig. 455 ; gena usually 1/4–1/2 of eye height; bend of vein M obtuse ( Figs 1, 3 )........................................................... Mesembrinellidae - Posterior thoracic spiracle smaller and more circular, closed anteriorly by a larger triangular felt-like lappet and posteriorly by a smaller circular lappet ( Rognes 1991 : fig. 5); anterior spiracle similar, but opening usually narrower above; subscutellum usually undeveloped or weakly developed; body color usually shiny green, blue, purple or bronze; gena usually about 1/2 eye height; bend of vein M usually acute or right-angled ( Fig. 4 )........................................ Calliphoridae