Chaetodiadema tuberculatum

Chaetodiadema tuberculatum is a species of sea urchins of the Family Diadematidae.

Their armour is covered with spines.

Chaetodiadema tuberculatum was first scientifically described in 1909 by Hubert Lyman Clark.

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A slender white object, perhaps a fragment of a sea urchin spike
A fragment of the sea urchin.