Science Notebook - Student Edition

Main Idea Details

Echinoderms and Invertebrate Chordates 281

Echinoderms Are

Deuterostomes

I found this information

on page.

Body Structure

I found this information

on page.

Analyze the importance of deuterostome development.

Sequence the steps that occur in the water-vascular system to

enable an echinoderm to move. Complete the flowchart by writing

the letters of the scrambled steps in the proper boxes.

The echinoderm moves.

A. Water is forced into the tube foot.

B. Water moves through the stone

canal to the ring canal.

C. Water is drawn into the

madreporite.

D. The muscles of the ampulla

contract.

E. With hydraulic suction, the tube

foot attaches to a surface.

F. Water moves to the radial canals.

Identify the echinoderm that moves in the described way.

Echinoderm Movement

burrows into rocky areas using movable spines

makes snakelike movements using tube feet and

arms

uses cirri to grasp soft sediments on the seafloor

crawls using tube feet and body wall muscles

Section 27.1 Echinoderm Characteristics (continued)

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