I gently hovered above this clam to capture a photograph when it was open, with its mantle extended. The rich soft mantle tissue is patterned with symbiotic photosynthetic dinoflagellate algae, and you can see the adductor muscle in the centre.

Raja Ampat, Indonesia

Canon EOS 5D Mk II, Canon AF macro lens 100mm, 1/200, F/25, ISO 200, two Inon strobes, Nexus housing, handheld

by Wayne Osborn, Western Australia