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Description of Metopus es

Members of this genus of metopid ciliates are 50 to 300 microns long. The cell is not flattened, but is asymetrical as the anterior region is twisted to the left. The oral apeture is located equatorially or subequatorially. An adoral zone of membranelles arises form the oral aperture and runs obliquely towards the left anterior end of the cell, following under the twisted anterior end. The cell is covered with somatic kineties; those on the ventral surface extend from the posterior to the adoral zone of membranelles; those on the dorsal surface exted to the anterior end and over the top of the spiraled anterior end. There is a series of closely aligned kineties, to the right and above the adoral zone of membranelles, that produce an anterior mane of cilia. A single ovoid macronucleus is typically situated in the middle of the cell. A single large contractile vacuole occurs in the posterior of the cell. Some species may be coloured or have prominent bacterial symbionts. Common, found in benthic, freshwater, marine; soil, anoxic and saprobic sites.

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