Flies is one type of insect that is always attached with dirty or dirty impression. This is probably because these flies love to settle in the dirt and they get food by spewing their saliva and eating it back. Flies are sub-orders of Diptera. It may be similar to mosquitoes, but in fact they are different. Just like mosquitoes, flies are also a fairly serious disease-transmitting medium in humans. Because when a fly over food or a place, then the food and the place will be contaminated with germs of approximately 125,000. In biology, scientists usually study the metamorphosis of flies because it is one of the perfect examples of metamorphosis.
Metamorphosis of flies starts from eggs of fertilization. Flies have a higher reproduction rate when compared to other insects. In addition, the rate of production is also more than other types of insects. This is due to their ability in terms of very efficient marriage is also effective especially in the breeding season. After the fertilization process, the mother fly will lay eggs. Usually he attaches his eggs to a food source such as fruit that is almost rotten. Then the next development is the change of eggs into larvae.
The metamorphosis of flies characterized by the change of eggs into larvae is divided into two periods namely the embryonic period and the postembrionic developmental period. The embryonic period is the phase in which the flies fertilize and then produce eggs which then hatch into young larvae within just 24 hours. This larval hatching occurs inside the place where the mother lays the egg. These fly larvae are sometimes called maggots. In this phase, the young larvae does not stop feeding and prepare itself into the subsequent metamorphosis period of post embryonic.
What is meant by post embryotic is the period after the egg turns into a larva. The larva itself is divided into three parts namely instar larvae I, instar larvae II, and instar larvae III. The distribution of larvae is based on the process of skin shifts in larvae that do occur 3 times with a period of 7 to 10 days per change. After the instar period is complete, the metamorphosis of the fly will enter the pupa or cocoon phase and then subsequently become an imago or sexual phase marked on the development of the wing until it becomes a fly with a perfect body.
As animals with perfect metamorphosis, flies through the path of life: eggs -> larvae (instar larvae I, instar larvae II, and instar larvae III) -> pupa or pupa -> imago or flies perfectly. Many scientists study the metamorphosis of flies and he is commonly used as a sample or example in the sub-theory of "Metamorphosis". The type of fly that is often used as the object of observation in biological studies is the fruit fly.