These are Heliozoa, single-celled organisms with many arms to give free but deadly hugs!
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Heliozoa arms are extensions of its cytoplasm and are used for locomotion and food capture. When a prey organism comes in contact with an arm, it is held tight by the tiny structures on the arm and pulled back to the body of the heliozoan to be wrapped and swallowed. A horrible way to go!
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And some in species, different individuals can gather together to digest bigger prey!
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630x magnification, real-time.

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