What is an Echinoder?

The echinoderm is like no other in the animal Kingdom. Echinoderms are characterized by spiny, an internal skeleton, a water vascular system, and suction cuplike structure called tube feet. Most adult echinoderms exhibit five-part radical symmetry.

Parts and FunctionParts and Function

The water vascular system, which is filled with fluid, carries out many essential body functions in echinoderms, including respiration, circulation, and movement.

Works CitedWorks Cited

• Sea star. AIMS Multimedia. 01 Jan. 1996. eLibrary. Web. 11 Mar. 2010.

• www.google.com/#hl=en&q=Echinoder+pictures&aq=f&aqi=&aql=f&oq=&fp=91fa8dc8225f38ce

• www.dkimages.com/.../Common-Sunstar-3.html