Diptera (Greek: in the meaning of "two", pteraberarti "wings") is a classification order of the Insecta class (insect) based on its wings having characteristics using only a pair of flapping wings which are functional to fly, while the other pair only as stabilizer auxiliaries or as an airspeed detector (also known as halterer) Although many insects can fly, but only diptera is considered a true fly because of this character. Diptera has large facet eyes when compared to its body.