FREDERICK R. MCCONNAUGHEY / SCIENCE PHOTO LIBRARY FREDERICK R. MCCONNAUGHEY / SCIENCE PHOTO LIBRARY
Aeolid nudibranch (Phyllodesmium longicirrum) climbing a dead coral branch near Papua New Guinea. The brown patches on the cerata are zooxanthellae, providing extra food to the nudibranch through photosynthesis. This nudibranch also stores a distasteful chemical in its cerata, possibly to deter predators.
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