Insects are the largest group of animals on the earth. They constitute about 80% of animal population.
They are robust in living and widely distributed.
Man has conquered every other animal except insects.
Some of the insects are useful to man while few of them are harmful.
But most of them are neutral and involved in natural ecosystem. They serve they serve the purpose of pollination, act as food to birds and other animals.
Insects as we see around are of different types. We can classify them based o their morphology, habitats and other characters.
1. Types of insects based on food habits:
a. Carnivorous insects: These insects rely other animals tissue to feed on. They do not cherish vegetarian diet.Ex: House fly, mosquito.
b. Herbivorous insects: They live exclusively on plant material like flower nectar, seeds, leaves etc. Butterfly, dragon fly.
2. Classification based on presence of wings:
a. Wingless insects: These insects lack wings in their entire life cycle. Ex: Apterygota, Scorpion, spiders etc.
b. Winged insects: These insects have wings. They are called true insects. In general most insects have wings like butter fly, house fly etc.
3. Types of insects based on method of Living:
a. Individually living: These insects search for their own food. They mostly consume dead material or plant material. Ex: cockroaches.
Ex: Head louse, bed mites etc.
4. Types based on the living habitat:
Insects differ in their place of abode. Few of them live on tress, while other on land and some of them on water or in water. Based on this we have aquatic and terrestrial insects.
a. Aquatic insects: These insects live on water. They can even dive to the depths of water and hunt the prey. They have special organs ad method of respiration. They have gills, respiratory tubes etc.
b. Terrestrial insects: These are the insects which survive only on land. They may even make holes and deep dwellings inside the earth for survival. Ex: Ants, cockroaches etc.