Polleniidae is a family of flies in the order Diptera. There are at least 6 genera and more than 190 described species placed definitively in Polleniidae, and other genera whose placement here is considered uncertain. The largest genus is Pollenia, with close to 190 species of flies commonly called "cluster flies".
The family Polleniidae has been considered a subfamily of Calliphoridae in the past, containing various genera and species. As a result of phylogenetic analysis, the subfamily Polleniinae was elevated to family rank by Cerretti, et al., in 2019, and assigned the genera listed below.
Genera Alvamaja Rognes, 2010 Dexopollenia Townsend, 1917 Melanodexia Williston, 1893 Morinia Robineau-Desvoidy, 1830 Pollenia Robineau-Desvoidy, 1830 (cluster flies) Xanthotryxus Aldrich, 1930
Incertae sedis Anthracomyza Malloch, 1928 Nesodexia Villeneuve, 1911
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