Kingdom Animalia; Phylum: Arthropoda (Arthropods)
Class: Insects (Insecta)

Insects together with arachnids belong to the oldest animals in the entire world. They are over 400 million years old from the evolutionary point of view. Insects can be found almost everywhere and often in huge numbers. On one hand they may annoy human beings but on the other hand they are very helpful in many ways for instance in removing dead animals, producing honey, etc.

Anatomy: An insect body is made of three main parts: a head, a thorax and an abdomen. The thorax/chest consists of three segments. There are three pairs of extremities on the ventral side and two pairs of wings on the dorsal side. The belly has got twelve segments and has no extremities. These animals have got complex eyes.
The Insect Class can be divided into two groups. On one hand there is insect which contain wings (Pterygota, majority) and on the other hand there is insect without any wings (Apterygota, such as: Collembola or Lepisma Saccharina).
Insacta Class can be divided into two other groups: Firstly, there is Hemimetabolia, which is the insect with an incomplete metamorphosis. The insect in this group undergoes several stages of life: a fertilised egg, a nymph and an imago (adult). The nymph and the imago usually live in the same water environment. Secondly, there is Holometabolia, insect with the complete metamorphosis. This insect undergoes following stages of life: a fertilised egg, a larva, a nympha and an adult animal. Larvae often inhabit different environment as adult insects do. This group includes butterflies, bugs, bees, hornets, flies etc…
Although insects can be sometimes dangerous and annoying to human beings in fact we cannot imagine our lives without it. Let’s face to sit down on the grass in the land and do not see any ants or hear any bees or spot any incredibly beautiful butterflies – it is even hard to imagine.