ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Nudibranch. Blue form of the nudibranch Dendronotus frondosus. Nudibranchs (sea slugs) are shell-less marine molluscs that live in seas around the world. They have external gills that give the nudibranch its name, meaning naked gills. Photographed in the White Sea, Russia.
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