red slate pencil urchin | 
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| Red Slate Pencil Urchin Scientific Name: Heterocentrotus mammillatus Class: Echinoidea Category: Sea Urchins Heterocentrotus mamillatus, commonly known as the slate pencil urchin, red slate pencil urchin, or red pencil urchin, is found throughout the tropical waters of the Indo-Pacific region | 
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