13776346 - Slate pencil sea urchins (Heterocentrotus mammillatus) colour the foreground of this Hawaiian reef scene with black triggerfish (Melichthys niger). They are also known as black durgon; Hawaii, United States of America13778372 - Red Slate Pencil Urchin (Heterocentrotus mamillatus) are common on Hawaiian reefs at shallow depths in high energy habitats such as the backwall of Molokini Crater offshore of Maui, Hawaii, USA seen here; Molokini Crater, Maui, Hawaii, United States of America70424136 - Hawaii, A female, red liomera crab, Liomera rubra, is holding a tail full of eggs in a slate pencil sea urchin (Heterocentrotus mammillatus).70423813 - Hawaii, slate pencil urchin, (heterocentrotus mammillatus).
