Sea urchins are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to 5,000 meters. The spherical, hard shells of sea urchins are round and spiny, ranging in diameter from 3 to 10 cm. The only parts of the urchin that are edible are the gonads, the reproductive organs that are so highly prized on the plate. The texture of sea urchin is creamy and custardy in the begi
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