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Key to Schewiakoff's abbreviations: a-- Anus cv--Contractile vacuole ccv--Canal of the contratile vacuole d--Ingested diatoms ek--Ectoplasm N--Macronucleus ncl--Micronucleus oe--Throat p--Pellicle P--Peristome tr -- Trichocysts wr -- Cilia series
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An individual that contains Zoochlorellae. a -- Anus cv -- Contractile vacuole m -- Undulating membrane N -- Macronucleus o -- Mouth pe -- Excretory pore of the contractile vacuole wr -- Cilia series Z -- Zoochlorellae
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Detail of the oral apparatus. l. pr -- Left edge of peristome m -- Undulating membrane o -- Mouth oe -- Throat P -- Peristome wr1-wr4 -- Cilia series (peniculi and paroral)