Fly

True flies are insects of the order Diptera (from the Greek di = two, and ptera = wings). Diptera is a large order containing an estimated 1,000,000 species of mosquitoes, gnats, midges and others, although only 12% (about 120,000 species) have been described. It is one of the major insect orders with ecological and human importance. Mosquitoes (Culicidae) are vectors for malaria, dengue, West Nile virus, yellow fever, encephalitis, and other infectious diseases.