Large Sputnik Urchins

Phyllacanthus parvispinus.

They are found in Southwest Pacific waters.

Resources.

• https://www.sealifebase.ca/summary/Phyllacanthus-parvispinus.html
• http://www.marinespecies.org/aphia.php?p=taxdetails&id=414201
• https://reeflifesurvey.com/species/phyllacanthus-parvispinus/