The female flies genitals are rotated to some degree from positions found in other insects. In some flies, this is temporary rotation during mating, but on the other, it is the permanent torque of organs that occur during the cocoon stage. This torsion may cause the anus located beneath the genitals, or, in the case of 360 ° of torque, on the sperm ducts that wrap around the intestine, even though the external organs are in their usual position. When the mating flies, the male initially flies over the female, facing the same direction, but then turns to face in the opposite direction.
This forces the man to lie on his back for his genitals to stick to the female flies, or the torque from the male genitals allows the male partner to temporarily stay upright. This causes flies to have more reproductive ability than most insects, and at a much faster rate. Flies occur in large populations because of their ability to mate effectively and in the shortest time during the breeding season.
The female puts its eggs close to the food source (as in almost ripe fruit), allowing the larvae to consume as much food as possible in a short time before it matures. Eggs hatch as soon as laid, or flies are ovoviviparous, with hatching of larvae within the parent body.
Fly larvae do not have true legs. Some of the Dipedish larvae, such as the Simuliidae, Tabanidae, and Vermileonidae species, have prolegas adapted to functions such as holding onto a substrate in flowing water, holding a host tissue, or holding prey. Roughly, there are some anatomic differences between larvae of Nematocera and Brachycera (see Classification, below), especially in Brachycera, there is a slight demarcation between the chest and abdomen, although the demarcation may be highly visible in many Nematocera, such as mosquitoes (see picture, both here and in mosquito articles), in Brachycera, the head of this larva is not clearly distinguished from other body parts, and there are few, if any, sclerites. Informally, as Brachyceran larvae are called maggots. But the term is often used nontechnical and indifferent to fly larvae or insect larvae in general. Brachyceran's eyes and antennae are diminished or absent, and the stomach also does not have a complement like Cerci. The lack of features is an adaptation to foods such as carcasses, decaying detritus, or tissue hosts surrounding larval endoparasit. Nematoceran generally has visible eyes and antennae, although it is usually small and functionally limited.
The cocoon has various forms, and in some cases develops in a silk cocoon. Having emerged from the pupa, adult flies rarely live more than a few days, and serve primarily to reproduce and to dissolve the search for new food sources.
Metamorphosis Flies
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:
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 imaginary or sex 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 pathway of life:
eggs -> larvae (instar larvae I, instar larvae II, and instar larvae III) -> pupa or cocoon -> imago or flies perfectly.
