A crustacean's body has three main parts: head, thorax, and abdomen. The animal's hard shell, called the <I>exoskeleton,</I> protects the body. The crustacean pictured here is a shrimp.
<BR><P>
World Book diagram by Patricia J. Wynne</P>
</BODY></P>
<!-- <PT>YES -->
<!-- <AR>From The World Book Multimedia Encyclopedia (TM) (c) «date» World Book, Inc., 525 W. Monroe, Chicago, IL 60661. All rights reserved. -->