Invertebrates

Invertebrates

What is an invertebrate?

Invertebrates dont have a backbone.

They are usually smaller than vertebrates.Most animals on earth are invertebrates.Some live on land and some live in water. Some can fly.

Classifying invertebrates

The most important groups are:

Jellyfishes or sea jellies

Molluscs

Arthropods

Worms

Sponges

Molluscs

Molluscs have a soft body.

Some, like snails, have a shell. Some of them, do not have a shell.

Many molluscs live in the sea.

Mussels, squids and octopuses are all molluscs.

Arthropods

Arthropods are the biggest group of invertebrates.

Their bodies are divided into 3 parts.

Insects (ants and bees) and arachnids (spiders and scorpions) are arthropods.

Worms

Worms have a long, soft body.

Some live underground and others live in water.

Some worms can live in human bodies. They make us ill.

Jellyfishes
or sea jellies

Jellyfishes live in water.

They have soft bodies and tentacles.

They don't have fins.

Be careful! Their tentacles can sting you!

Sponges

Sponges live in water.

They have holes (pores).

They never move.

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Education

Invertebrates