Sens communMarine animal characterized by a fivefold radial symmetry, protected, depending on the species, by calcareous spikes or more or less developed calcite plates. Echinoderms include the starfishes, crinoid (sea daffodil), sea urchins, sea cucumbers and brittle stars. They have tubular "feet" and are able to move (very) slowly.
According to the Ministry of Agriculture and IOWater
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