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Drosophila are small flies, that is to say members of the Order Diptera. Adult D. melanogaster are about 1 mm in length, the female being slightly larger than the male. They are distinguished from most closely related flies by their "pectinate" aristae, hair-like structures carried by their antennae. When flying D. melanogaster and its relatives and its relatives have a very distinctive "jizz", hard to describe but once seen forever recognized and diagnostic.