sea urchin shells

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formandpheromone.com

Photo from the coral reefs of Sulawesi by Vittoria Amati

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telegraph.co.uk

Phyllodesmium poindimiei, the tentacles look like they're glowing

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flickr.com

Photo from the coral reefs of Sulawesi by Vittoria Amati

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telegraph.co.uk

Sea Anemone

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soocurious.com