Duplicate of Unit 7: The Animal Kingdom: Invertebrate Animals

This group consists of the sponges.

These have four pairs of legs.

They move contracting their bodies or being pushed by ocean currents.

Describe the body of Porifera

The marine animals that live on the ocean floor or near the coast.

Some are parasites, others are free-living.

The body is divided into rings called metameres.

They have stinging cells.

Rings that carry out the life functions because some internal organs are repeated in each rings

Jointed appendages enable this animal to have more mobility.

They are found in the sea, in fresh water and in damp soils.

No distinct head

Characteristics of echinoderms include:

The head has one pair of sensory antenae.

Describe the body of Annelids

Annelids have no legs, but they move about by using rigid, hair-like structures called

There are five pairs of legs on the thorax.

Earthworms are

The front legs are claws.

The largest group of living things

Thorax: three pairs of articulated legs. One or two pairs of wings.

The segments of the abdomen are thin and flexible.

The abdomen is segmented with no appendages.

These are the simplest invertebrate animals. They have no organs.

Trunk: the thorax and abdomen are fused.

The head is well-developed. It has two large eyes with excellent vision.

Invertebrates live in __________ environments.

More than 95% of the known animal species are intertebrates.

They live in aquatic or damp terrestrial places.

Abdomen: most are balloon shaped, but not segmented.

The visceral mass is protected by a shell formed by two parts.

The shell consists of one piece and is spiral shaped.

These have a very large foot which contains the stomach.

The long visceral mass gives the animal a hydrodynamic shape. Most have an internal shell.

Describe the body of Molluscs

The long, soft, flat body is divided into segments.

Motile means

Spiders are

Most invertebrates have