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Comprehensive
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crinoid an echinoderm characterized by a cup-shaped body to which feathery, radiating arms are attached, such as the sea lily. [1/3 definitions]
sea cucumber an echinoderm that has a long, leathery, cucumber-shaped body with a cluster of tentacles surrounding the mouth at one end.
sea urchin a soft-bodied echinoderm that is enclosed in a hard round or disk-shaped shell, covered with long thin movable spines.