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Description of Ichthyophthirius multifilisEctoparasitic ciliate often associated with fish, body subglobose or ovate, flexible and elastic. Cuticular surface finely and evenly ciliated all over, the cilia arranged in fine, intercrossing, obliquely parallel rows. Extrusomes lying below the cell surface seem present in younger cells. There is an apical adhesive suctorial disc that is minute and cup-like, its inner surface bearing about twenty, inwardly radiating, larger cilia. Contractile vacuoles numerous, minute, scattered throughout the cortical layer. Nucleus band-like, curved. Length about 170 microns.