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Scientific names use a genus and species to identify exactly which organism you’re talking about. The common house fly is Musca domestica. This distinguishes it from other flies in the same genus or similar-looking flies: Drosophila melanogaster is the tiny fruit fly used in genetics studies; Musca autumnalis is the face fly that mainly visits cattle; and Stomoxys calcitrans is the biting stable fly. Musca domestica is the species most closely associated with homes and human environments, making it the correct match for the common house fly.