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EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ECHINODERMS
Definition:
The phylum Echinoderms is a wholly marine group whose members include
the familiar starfish and sea urchins often found on the shore. Some of
their particular features are their five-sided adult symmetry, their
endoskeleton which consists of many small crystals of calcium carbonate
and tube feet, which are outward manifestations of their water vascular
system. 
Reference:
Burn, David M. Animal World. 1980. Octopus Books Ltd. London.
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