GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Solar-powered phyllodesmium nudibranch (Phyllodesmium longicirra) on a reef. Nudibranchs, or sea-slugs, are shell-less marine molluscs that live in seas around the world. Phyllodesmium longicirrum is a very large species. It contains photosynthetic zooxanthellae (symbiotic dinoflagellates), which allow it to use energy from sunlight. Photographed in Lembeh, Sulawesi, Indonesia.
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