UNIT 3: INVERTEBRATES

3. OTHER GROUPS OF INVERTEBRATES

There are other groups of invertebrates with very simple structures. These invertebrates are worms, porifera, echinoderms, jellyfish, anemones and corals.

Worms

Their bodies are long and soft and are usually ringed

Some are terrestial and others are aquatic.

Some are parasites

Worms are invertebrates with long, soft bodies. They can live on land or in the water. Some are parasites.

Porifera

They have soft, irregular bodies with lots of pores, like sponges.

They eat the substances that they filter through their pores.

They are aquatic and most live on the rocks in the sea.

Porifera have soft, irregular bodies with pores. They are aquatic.

Echinoderms

Their bodies have a radial symmetry.

Hard pieces cover and protect their bodies. Some have spiny bodies, like the sea urchin.

They are aquatic animals that move sloyly along the sea floor.

Echinoderms have bodies with a radial symmetry that have hard pieces to protect them. They live in the sea.

Jellyfish, anemones and corals

They have soft bodies, although corals have hard covering.

They are aquatic and most live in warm water. Corals and anemones live on rocks. Jellyfish float in the sea.

Jellyfish, anemones and corals are aquatic. They have soft bodies although corals have hard covering.

Activities

1.- Match the group of invertebrates with their characteristics

                                  Worms                        They have soft bodies with pores

                                Poriferia                        Hard pieces cover thir bodies

                         Echinoderms                        Some live on the rocks and others float in the sea

Jellyfish, anemones and corals                        Some are parasites

2.- Fill in the gap

Porifera have ______________, ___________bodies with lots of __________, like sponges.

They eat the substances that they _________ through their pores.

They are _____________ and most live on the rocks in the sea.