LOUISE MURRAY / SCIENCE PHOTO LIBRARY LOUISE MURRAY / SCIENCE PHOTO LIBRARY
Nudibranch and shrimp. Emperor shrimp (Periclimenes imperator) riding on a large nudibranch (Ceratosoma tenue). Nudibranchs, or sea-slugs, are shell-less marine molluscs that live in seas around the world. This nudibranch has a mantle up to 15 centimetres long, with a toxic skin flap protecting the gills (upper right). The emperor shrimp, like other Periclimenes shrimps, lives symbiotically with larger animals, most often anemones and sea-slugs. Photographed in Lembeh Strait, off Sulawesi, Indonesia.
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