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Acanthocystis: Carter (1863) Freshwater plankton, occasionally marine plankton. Unicellular heliozoans with multiple external bifurcate or
pointed siliceous bristles anchored in and extending from flat siliceous
scales (plates) lining the periplast. Two or three
species of Acanthocystis,
including A. aculeata
and A. turfacea (most common), contain multiple
endobiotic photosynthetic cells of Zoochlorella.
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