Invertebrates Classification

Read the description, then decide which group this animal belongs to:

In shallow water at the beach, Manuel saw an animal whose body was protected by hard plates. Its body also had radial symmetry. The animal pumped water into its tube feet to move.

• arthropods

• echinoderms

• mollusks

• sponges

Roundworms live wherever there is water. They have nostrils but no eyes. How are they able to move about in the water?

• They bend from side to side to move.

• They pump water through their tube feet.

• They use their jointed legs to walk.

• They use their tentacles to push the water.

Read the description, then decide which group this animal belongs to:

Angela found an animal while walking in the forest. Looking closely, she saw it had jointed legs, and its body was divided into segments. Its hard exoskeleton protected it from other animals.

• arthropods

• echinoderms

• mollusks

• sponges

Which type of worm has a body that is divided into many ring-like parts?

• roundworms

• feather-duster worms

• segmented worms

• flatworms

A mollusk can be recognized by several common characteristics. They have a soft body with a thick skin called a mantle. Which other characteristic is common to all mollusks?

• tentacles with stinging cells

• the ability to regenerate when damaged

• antennae

• a foot for movement

A marine biologist was taking photographs of ocean animals. One animal had tentacles with long stinging cells on the end. Which of these groups did the animal belong to?

• mollusks

• cnidarians

• arthropods

• sponges

Which type of worm has eyespots and can regenerate a damaged body part when it is injured?

• flatworm

• roundworm

• leech

• segmented worm

Sponges live only in water and reproduce through budding. What else is true about sponges?

• They have nostrils and no eyes.

• Their body is made of many ring-like segments.

• They have the ability to regenerate a damaged body part.

• They have tentacles with stinging cells at the end.