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Clam
Clam (Tridacna sp.). This clam lives close to the surface, embedded in sand or coral, and is sessile (immobile). It has zooxanthellae (unicellular algae) growing as symbionts in its tissues. The bulk of the clam's nutrients are not gained from filter feeding, like most molluscs, but from these algae. The algae photosynthesise, hence the clam living near the surface, and pass energy and nutrients to the clam. The algae are also responsible for the colourful mantle (interior, blue). Photographed in the Red Sea, Marsa Alam, Egypt.
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