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Paramecium morphology. A, Scanning electron microscopy image of P. tetraurelia; scale bar: 10 μm (Valentine et al., 2012). B, Paramecium caudatum (Jennings, 1899a), a large species (∼200 μm) with a pointed posterior end. a, anterior end; p, posterior end; g, oral groove; m, mouth; o, oral side; ab, aboral side; cv, contractile vacuole. The drawing also shows food vacuoles and cilia.
