Richard Robinson / Kina, sea urchin (Evechinus chloroticus) in Breaksea Sound, Fiordland National Park, New Zealand.
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Solvin Zankl / Sea urchin (Evechinus chloroticus) Poor Knights Islands, Marine Reserve, New Zealand, South Pacific Ocean, July.
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Fred Bavendam / Slate Pencil Urchin (Heterocentrotus mammillatus) pair attached to rock wall, Kona, Hawaii
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Norbert Wu / Slate Pencil Urchin (Heterocentrotus mammillatus) spines are stony and used for wind chimes, Hawaii
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Norbert Wu / Pencil Urchin (Ctenocidaris perrieri) and Brittle Star (Ophionotus victoriae) similar to deep sea species, New Harbor, Antarctica
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David Fleetham / Close-up of Horned helmet shell (Cassis cornuta) hunting Red Pencil Urchin (Heterocentrotus mamillatus), Hawaii, USA, Pacific Ocean.
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David Fleetham / Day octopus (Octopus cyanea) releasing an ink cloud to escape predator on reef, as Red pencil urchin (Heterocentrotus mamillatus) rests behind, Hawaii, USA, Pacific Ocean.
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David Fleetham / Psychedelic wrasse (Anampses chrysocephalus) juvenile swimming in reef, with Slate pencil sea urchin (Heterocentrotus mammillatus) behind, Hawaii, Pacific Ocean.
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Joel Sartore / Photo Ark / Common sea urchin (Heliocidaris erythrogramma) portrait, Melbourne Zoo. Captive, occurs in western Pacific Ocean.
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Joel Sartore / Photo Ark / Common sea urchin (Heliocidaris erythrogramma) portrait, Melbourne Zoo. Captive, occurs in western Pacific Ocean.
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David Fleetham / Commerson's frogfish (Antennarius commersoni) juvenile sheltering among spines of Slate pencil sea urchin (Heterocentrotus mammillatus), Hawaii, Pacific Ocean.
