ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Shaggy mouse nudibranch (Aeolidia papillosa). Nudibranchs 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 species lives in the Pacific and Atlantic coasts around North and South America and Northern Europe. Photographed in the White Sea, Russia.
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