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Purple Sea Urchin
紫海膽
Heliocidaris crassispina
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Despite the difference in their appearances, sea urchins, sea cucumbers and starfishes all belong to the same phylum Echinodermata.
儘管外觀不同，但海膽、海參和海星都屬於同一門，即棘皮動物門
Has a spherical body covered with spines and small sucker-like projections called tube feet.
身體由刺及名為「管足」的小型吸盤管條所覆蓋著
Often clustered and attached to the surface of rocks or in rock crevices with their tube feet.
在野外時能發現一群群簇擁的紫海膽，牠們會用附足附著在岩石表面或間隙中
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