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Protist (Ancoracysta twista), Location: An aquarium in San Diego
Discovered in an aquarium in San Diego, California, USA, this new single-celled protist has challenged scientists to determine its nearest relatives. Ancoracysta twista is a predatory flagellate that uses its whip-like flagella to propel itself and unusual harpoon-like organelles, called ancoracysts, to immobilize other protists on which it feeds. The geographic origin of the species in the wild is not known.