Characteristics
- They live everywhere: on land , in the air and in the water.
- It is the biggest group of invertebrates.
- They all have external skeleton to protect their body.
- They all have many jointed legs.
- The body is divided into segments.
- They can be herbivores, carnivores or omnivores.
- Insects: It is the biggest group of arthropods. Their body is divided into 3 parts (head, thorax and abdomen). They have two antennae. They can have wings.
- Arachnids: Their body is divided into two parts cephalothorax (head and thorax together)and abdomen. they don have antennae or wings.
- Crustaceans: The majority of crustaceans have a body divided into two parts: cephalothorax and abdomen. They have two antennae and don't have wings.
- Myriapods: they have more than 10 legs
SPONGES
Characteristics:
- They live at the bottom of the sea
- They are fixed to the ground. They can't move around.
- Their body is full of holes called pores (pores are used to get water and food).
JELLYFISH
Characteristics:
- They live in the sea. They can be very dangerous.
- They have poisonous tentacles that they use to hunt other animals or to defend themselves.
ECHINODERMS
Characteristics:
- They are starfish and urchins belong to this group of invertebrates.
- They have many small feet that they use to move along the bottom of the ocean.
MOLLUSCS
Characteristics:
- They can live in water or in land
- They have a soft body and the majority have a shell.
- There are 3 types of molluscs: with one shell (snails), with two shells (mussels) or with internal shell (squid).
WORMS
Characteristics:
- They can live in water or in land.
- They have a long soft segmented body made up of rings.
