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The acantharians are one of the four types of large amoebae that occur in marine open waters. "Large" in this case is relative, as this microscopic creature is have skeletons made of a single crystal of strontium sulfate that quickly dissolves in the ocean water after the cell dies. Together with other microscopic organisms, though, amoebas like this account for most of the biomass on Earth. (thedailygreen.com)
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