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Pyramid-shaped Urchin
This pyramid-shaped urchin (genus Echinocrepis) was one of several of these animals seen during the third dive of the 2023 Shakedown + EXPRESS West Coast Exploration expedition. This one was spotted at a depth of 3,952 meters (2.46 miles). While not new to science, these urchins are rarely seen, as they are very delicate and live in very deep waters.
Credit

Image courtesy of NOAA Ocean Exploration, 2023 Shakedown + EXPRESS West Coast Exploration.