SCUBAZOO / SCIENCE PHOTO LIBRARY SCUBAZOO / SCIENCE PHOTO LIBRARY
Nudibranch (Hypselodoris bullocki). Nudibranchs are shell-less marine molluscs that live in seas around the world. Here the external gills (orange, centre) can be seen which give the nudibranch its name, meaning naked gills. Photographed in the Lembeh Strait, Sulawesi, Indonesia.
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