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Didinium is a genus of carnivorous protozoans belonging to the order Holotricha. These single-celled organisms are a type of ciliate, generally considered the most evolved and complex among protozoans.12

Key characteristics of Didinium:
* Diet: They are known to feed on Paramecium.1
* Structure: As ciliates, they possess cilia, which are short, hairlike organelles used for movement and capturing food.2
* Etymology: The name Didinium comes from Greek deinos, meaning "terrible".1

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2 Britannica Sources
  1. didinium
  2. ciliate

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