MODEL OF HOUSE FLY

The house fly is an example of the order Diptera. This order includes forms with two transparent membranous wings behind which are a pair of small, club-shaped organs known as “halters” or “balancers” which are the modified hind wings. There is no distinct prothorax. The parts of the mouth are adapted for piercing or sucking. The metamorphosis is complete. The larvae are usually footless grubs or maggots with the head retracted and the pupae are either exposed with the limbs free or enclosed in a scaly case. Most of the Diptera are fairly small and dull coloured. Many are parasitic and many others are scavengers. Some are aquatic.