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Project Noah Nature School
Genus: Didinium
Didinium has a needle-like trichocyst which it uses to impale its victim (usually a Paramecium) then devour its prey whole.
Vernal pond in SW Pennsylvania.
You can best see the piercing trichocyst when the Didinium rotates and faces left near the final third of the video. https://youtu.be/_Q6YOesI-gY
Spotted on Jun 1, 2015
Submitted on Jan 7, 2017
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