Diadema sp. is long-spined urchin and Trypneustes sp. is short-spined urchin. Trypneustes sp. on right has attached coral pieces and urchin shell. Possibly protection or camouflage.

Image ID: reef0036, NOAA's Coral Kingdom Collection
Location: Between South Point and Kealakakua Bay, Hawaii
Photo Date: June 1967
Photographer: Dr. James P. McVey, NOAA Sea Grant Program


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