GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Nudibranch (Gymnodoris aurita). Nudibranchs are shell-less marine molluscs that live in seas around the world. Here the external gills (top) can be seen which give the nudibranch its name, meaning naked gills. Photographed off Rinca, Indonesia.
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