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The name of this phylum refers to animals
with spiny surfaces. (Greek, echino = spiny, derma = skin).
All the members of this phylum are marine animals, adults are radially
symmetrical, and most are sessile or slow moving (sedentary) animals.
They are characterized by their unique
water vascular system with tube feet for moving and capturing pray. The
members of this phylum are: starfishes, sea urchins, sea biscuits, sea
cucumbers, and sand dollars.
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