The Group Insects belongs to category of animals which have at least six legs. They belong to group of invertebrates. meaning that they don’t have backbone. They are considered to be the most diverse form of animals in the world. Their quantity of species of insects are more then half of all the known living creatures.
Their body is exoskeleton can be divided into three main section.
The Head contains at least a pair of antennae. Insects eyes are in their head. Their eyes are of compound. Which me
ans they can have multiple eyes. Mouth and biting organs are also present in this section. The antennae are sensory
Their legs are jointed to thorax. Which is made up of a hard material. Some insects have wings. these wings are attached to thorax.
The abdomen section of insects are usually soft. It is located just behind the thorax. This part of insect holds multiple systems. The list of common systems are mentioned below.
- Digestive organs.
- Sting organs (if exist).
- Reproductive organs.
Abdomen are expandable body part of insect. It increases its size when the insect feeds. They are found all over the world. There are mainly crawling. A little number of insects lives under water. Many of the insects lives on land.
The digestive organs are mainly located in abdomen. Whereas some organs that secrete saliva are located in thorax.
The structure of this system is long enclosed tube. It starts from mouth and ends at anus. The foods is digested here to absorb nutrients and other substances.
Mainly, food of such creatures are macromolecules, proteins, fats and other similar substances. When the food is taken in, it is broken down and mixed with saliva. The food is moved to the tube.This is where multiple enzymes are mixed to break the food into smaller fractions.
Male insects have reproduction organs called testis. Some male have a pair of testis. This organ is connected to a duct for ejaculation of sperms. However in female the reproduction organ are overies. There are almost two overies where eggs are developed and grown. The overies also have tendency to store sperms.
Creatures of this category have tendency to produce several eggs at single time. The overies also develops substance for the protection of eggs. That substance is glue have glue like structure.
Insects does not have lungs for respiration. Instead they uses sacs and internal tubes to accomplish the subject task. Oxygen is directly provided to tissues and cell through these tubes.
List of common insects :
- Bed bug
- House Fly
- Lady bird
- Dragon fly
- Grass hopper
- Honey bee
These creatures are categorized as parasites. Their source of food is blood. Bed bugs are named after they were excessively found in beds of humans. They stay in foam and bedsheets and drinks the human blood.
There targets are not limited to humans but also different animals. When these creatures bite. They left red spots. The bitten area has sever itching and this itching stays for many days. While feeding is done on human. They also live and female lay eggs where the at the food residence.
Animals of this category mostly are harmless until they are been provoked. Most of them are equipped with self defensive organs.
These eight leg insects are master of creating webs. Although not every spider develops web. Some of them hunts for their prey by direct attacking. Web creating spiders commonly stay their and wait for pray or insects to get trapped. Most of them have eight eyes in their head.
- Brazilian wander spider
- widow spider
- Wolf spider
- Jumping spider
- lynx spider