Echinoderms definitions

Echinoderms

a group of marine animals that includes seastars, sea urchins and sea cucumbers, abundant on the floor of the deep sea, as well as in shallower seas.
Found on http://en.wikipedia.org/wiki/Glossary_of_fishery_terms

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Echinoderms

a phylum which is comprised of sea stars, serpent stars, sea cucumbers, and sea urchins. They are radially symmetrical and some have sharp spines.
Found on http://www.encyclo.co.uk/local/20126

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Echinoderms

a group of marine animals that includes seastars, sea urchins and sea cucumbers, abundant on the floor of the deep sea, as well as in shallower seas.
Found on http://www.translationdirectory.com/glossaries/glossary245.php

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