Bivalves dislodged from beneath a single rock in a coral lagoon in the South Pacific. Included are pen shells, pearl oysters and a young Tridacna. Note the bivalve with its inhalant (ventral) and exhalant (dorsal) siphons extended.
John B. Burch (photographer; copyright holder), Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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