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Arbacia
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Definition
: A genus of SEA URCHINS in the family Arbaciidae. They have only one spheridium (stalked body) per ambulacral area (contains tube feet); most sea urchins have several spheridia per area.
Other names
punctulatas, Arbacia; punctulata, Arbacia; Arbacias; Arbacia punctulatas; Arbacia punctulata