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Morphological features of echinoderms

Write down basic morphological features of echinoderms?

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Echinoderms, as the name points to (derma = skin, echino = spiny), are creatures with the spines originated from the endoskeleton. Their endoskeleton is made of calcareous plaques that besides spines contain pedicellaria, small pincers used to clean the body and to help the capturing of prey. They also present a hydrovascular system known as the ambulacral system. Adult echinoderms have pentaradial symmetry; the radial symmetry in these animals is secondary, present only in adults.

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