A Red Slate Pencil Urchin (Heterocentrotus mamillatus) rests on Molokini Backwall which is located offshore of Maui; Hawaii, United States of America

horizontal color colour colorful close up detail bright landmark sea underwater deep ridge landmarks details tourism tropical exotic scuba coral reef invertebrate saltwater colony echinoderm hawaii maui tropical climate tourist attractions attractions destinations wild marine life pacific ocean pacific nobody red reefs attraction destination travel ocean colourful color image invertebrates echinodermata water close up tourist attraction travel destination travel destinations place of interest coral reef colour image no one no people directly above dive sites indo pacific sea urchin sea urchins coral reefs molokini crater hawaiian islands underwater photography places of interest echinometridae heterocentrotus mamillatus backwall slate pencil urchin dive site seacam underwater housing phylum echinodermata class echinoidea closeup red pencil urchin diving destination diving destinations slate pencil urchins natural elevation order echinoida red pencil urchins