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There are five myrmecophilous species in this genus. These are small Microdontinae flies with a distinctive abdominal shape; the second segment is widened, flattened, and flared, with its lateral margin subcircular, thickened, and rounded, and the rest of abdomen (third–fifth segments) narrowed and cylindrical. Larvae are found in ant nests. They are native to southern North America. The genus was previously treated as a subgenus of Microdon.

List of Omegasyrphus and their Host Ants
Genus and species Author and Year Ant Host Distribution Notes
Omegasyrphus baliopterus (Loew, 1872) ants Mexico. United States: California, Texas, Illinois
Omegasyrphus coarctatus (Loew, 1864) ants Florida
Omegasyrphus gracilis (Bigot, 1883) ants North America
Omegasyrphus painteri (Hull, 1922) ants Arkansas
Omegasyrphus pallipennis (Curran, 1925) ants New Mexico


  • Reemer, M. & G. Stahls 2013. Phylogenetic relationships of Microdontinae (Diptera: Syrphidae) based on molecular and morphological characters. Systematic Entomology 38 (4): 661-688.