Invertebrates 111124022006-phpapp01

Invertebrates

What is an invertebrate?

Invertebrates don’t have a backbone.

They are usually smaller than vertebrates.

All invertebrates are oviparous.

Most animals on earth are invertebrates.

Some live on land and others live in the soil.

Some live in water.

Some can fly.

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What do invertebrates eat?

Not all invertebrates eat the same food.

Some eat only plants.

They are herbivores.

Some eat only other animals.

They are carnivores.

Some eat plants and animals.

They are omnivores.



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Classifying invertebratesIt is more difficult to classify invertebrates

because there are so many groups.The most important groups are:

Molluscs

Anthropods

Worms

Jellyfish

Sponges

Starfish



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MolluscsMollusks have a soft,

muscular body.

Some, like snails, have a shell.

Many molluscs live in the sea.

Mussels, oysters and octopuses are all molluscs.



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AnthropodsAnthropods are the

biggest group of invertebrates.

Their bodies are divided into 3 parts.

They have a hard skin and joints in their legs.

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



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WormsWorms have a

long, soft body.

Some live on land and others live in water.

Some worms are parasites. They live inside another animal and feed on them.



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Jellyfish

Jellyfish live in water.

They have soft bodies and tentacles.

Be careful! Their tentacles can sting you!



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SpongesSponges have

soft bodies covered with holes.

They live in water.



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Starfish

Starfish are protected by hard outer parts.

They live in water.

They usually have 5 arms, but some can have even 20!

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