ANGEL FITOR / SCIENCE PHOTO LIBRARY ANGEL FITOR / SCIENCE PHOTO LIBRARY
Sea-slug gills. Close up of the gill appendages of a Flabellina affinis nudibranch. 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. Photographed in the Mediterranean Sea, Alicante, Spain.
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