floating fresh purple sea urchin washed ashore clear water

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Floating Fresh Purple Sea Urchin washed ashore in clear water

Floating Fresh Purple Sea Urchin washed ashore in clear water. Sea urchins or urchins are small, spiny, globular animals that, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. The name urchin is an old word for hedgehog, which sea urchins resemble.