A sea urchin (order Holasteroida)
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Sea Urchin
Marine life seen while exploring the Murray Fracture Zone during the Beyond the Blue: Papahānaumokuākea ROV and Mapping expedition was noted as being low abundance, but high diversity. Among the variety of animals encountered was this rare sea urchin (order Holasteroida).
Credit

NOAA Ocean Exploration, 2025 Beyond the Blue