GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Mantle of the boring clam (Tridacna crocea), also known as the crocus clam, crocea clam or saffron-coloured clam. The colours come from symbiotic zooxanthellae dinoflagellates in the clam's tissues. Photographed in Indonesia.
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