Bequia, St Vincent and the Grenadines. 35 feet of sea water on sand. I found quite an explosion of these tiny (1cm at most) black things. They seemed to be in couples and if they bumped into each other they would disappear under sand together and then reappear after a few seconds. I saw them at the same date and place last year. Help with identification please! This overexposed image showed their outline up the best so apologies for wierd photo!
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