Abstract
Silver impregnation shows the buccal cavity of Cyclidium glaucoma to consist of an undulating membrane on the right border and of three membranelles (M-1 near the anterior end; M-2 and M-3 in the posterior end of the cavity). The genus Cyclidium should be excluded from the family Pleuronematidae and placed in or close to the family Tetrahymenidae.
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