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  1. Heterocentrotus mamillatus - Wikipedia

  2. Meet Ha‘uku‘uku‘ula‘ula the Red Pencil Urchin

  3. Red Pencil Urchin (Heterocentrotus mamillatus) | Red Sea Creatures

  4. Heterocentrotus mamillatus - Red pencil urchin - Snorkeling Report

  5. Conservation Case Studies - Echinoderms | AMNH

  6. Sea urchin - Wikipedia

  7. Heterocentrotus mamillatus, Red pencil urchin - SeaLifeBase

  8. Section: Urchins: Group: Common Urchins: Species: …

  9. Sea Stars, Urchins, and Relatives - Smithsonian Ocean

  10. Ha’uke’uke ‘Ula’ula — Red Slate Pencil Urchins of Hawaii