The name echinoderm literally means "spiny skin." Echinoderms are characterized by their pentaradial symmetry, internal skeletons, a water vascular system, and tube feet. The phylum Echinodermata is split into 5 main classes. Asteroidea which includes sea stars, Crinoidea with the sea lillies and feather stars, Echinoidea including the sea urchins and sand dollars, Holothuroidea with the sea cucumbers and Ophiuroidea including brittle stars and basket stars. Echinodermata is the only phylum the exists exlusively in marine habitats.Read more about the classes: click here.
http://www.cyhaus.com/marine/Echinoderm.htm
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