Insect
means "segmented" in Latin. There are about a million different types of insects
that have been discovered, described and named and many more that have not been discovered yet.
They form the largest and the most successful group of animals in the world.
Insects have colonized all environments, though they are most numerous in the
humid tropics, and have
evolved a very wide range of forms for many reasons, including camouflage,
predatory activities, flight, niche
habitat exploitation, mating, egg-laying and food.
Group Characteristics
All insects
are Arthropods which means they have no backbone, but an external "toughened
skin" or exoskeleton and pairs of joined legs. Additionally, insects in the
adult form posses a body divided into three sections:
Head, Thorax and Abdomen. Most adult insects have 3 pairs of legs and many have
2 pairs of wings. All these
are attached to the thorax.
Insect Classification
Insects are currently divided
into 31 orders. Insects are classified as follows:
Kingdom:
Animalia (animals) Phylum: Arthropoda (arthropods) Class: Insecta (insects).