LOUISE MURRAY / SCIENCE PHOTO LIBRARY LOUISE MURRAY / SCIENCE PHOTO LIBRARY
Nudibranch, a sea slug mollusc species of Cerberilla live in sandy substrates where they burrow beneath the surface and so are seldom seen. This animal was visible from over a metre, as fluorescents pigments in its body emitted light when targetted with a blue light. Probably Cerberilla annulata. Tondoba Bay, Marsa Alam, Red Sea, Egypt.
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