This document summarizes key information about the phylum Echinodermata. It discusses their defining characteristics of spiny skin, pentaradial symmetry, and a water vascular system. It also outlines the five classes of echinoderms - sea urchins, brittle stars, sea cucumbers, sea stars, and sea lilies - and notes traits like their methods of movement, nutrition, reproduction and more. The document provides an overview of echinoderm anatomy, physiology and ecology.
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