Genus: Cell body is ovoid, dorsoventrally flattened; dorsal surface may be equipped with some ornamentation; three groups of cirri (frontoventral, transverse & caudal); macronucleus C-shaped, "3"-shaped, or horsehoe-shaped (Carey, 1992).
Species: Large, ovoid; 160 μm long; peristomial collar present (high & prominent), right peristomial lip with depression; no ornamentations; wide buccal area wide, triangular in shape; peristome 1/2 of the body length; 9 frontoventral, 5 transverse, 4 caudal cirri; macronucleus "3"-shaped (Carey, 1992).
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Intact cells, fixed and stained cells
Morphological changes at starvation