Internal functioning of the insect
In regard to their habits of life and feeding, insects exhibit extreme variations, which are evident in the life cycles of various species. Insects have developed several regions in the mouth to adapt to the diet that corresponds. Their ancestors had three pairs of jaws (jaws). Currently, the first pair remains well developed in all chewing species; the second pair of jaws – the maxilas – is smaller and is in charge of helping to ingest or suck the food inside the mouth; The third pair is formed by two welded pieces that constitute the so-called lip.
The most important sensory organs for insects are the antennae, the eyes and the hairiness of the body. The antennas are used to determine the shape, texture and smell of objects.
For many insects, the environment that surrounds them should not be more than a set of smells, tastes, vibrations and sounds that humans can not grasp. The vibrations are perceived by insects through ears, generally arranged in the legs, abdomen and antennae.
The brain of insects is a set of nerve cells that are responsible for integrating the behavior of these animals. Despite the small size of these living beings, their behavior can be quite complex, which is observed, for example, when an insect makes a hole in the sand for another to fall into it; at that time he throws more sand on him and thus captures it.
One of the characteristics of the development of insects from birth to maturity is the metamorphosis, the passage through one or more different immature body forms to reach the phase of imago, or adult form. In most insects some kind of metamorphosis occurs, although in some species, such as in the Thysanides, the newborn insect is essentially similar in its form to the imago.
The immature phase of insects like dragonflies, called nymphs, transforms into adults without a pupal phase, but through a series of molts. Each molt brings the insect closer to its mature form or imago. In this sequence, the aquatic nymph, with fully developed thorax and flight muscles, has left the water to shed the skin for the last time. Blood is pumped to the head and thorax, which swell and rupture the nymph’s cover. The skin is then broken by the back, and the insect leaves the pod. As the blood circulates in the soft and distended parts that have just been released, the abdomen lengthens and the wrinkled wings unfold forming the ribbed wings of the adult. In less than two hours, the insect’s structures will have hardened enough to allow it to fly, but it will not acquire its characteristic black and green colors until several days pass.