ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
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. This specimen was photographed in the White Sea on the northwest coast of Russia.
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