Section 1

objectives

• Discuss four distinguishing characteristics of echinoderms.

• Describe representative species from each of the five classes of echinoderms.

• Describe the water-vascular system and other major body systems of echinoderms.

• Compare sexual and asexual reproduction in sea stars.

vocabulary echinoderm ossicle water-vascular system tube foot test pedicellaria madreporite stone canal ring canal radial canal ampulla cardiac stomach pyloric stomach bipinnaria figure 38-1

Notice the bilateral symmetry in these echinoderm larvae. The larvae develop into radially symmetrical adults.

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