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Detail of the well-developed adoral zone of membranelles along the left border of the large buccal cavity of Bothrostoma undulans, a metopid ciliate that is the type species for the genus. From sapropelic sediments in freshwater aquaculture pond near Boise, Idaho. DIC optics.
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Dorsal view of Bothrostoma undulans, a metopid ciliate that is the type species for the genus. The somatic kineties are longitudinal. There is a long tuft of caudal cilia. From sapropelic sediments in freshwater aquaculture pond near Boise, Idaho. DIC optics
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Portrait of Bothrostoma undulans, a metopid ciliate that is the type species for the genus. The elongate body is dorsoventrally flattened, narrowing anteriorly to a rounded point, which twists slightly to the left. The large buccal cavity extends 2/3 the body length, bordered on the right by a prominent undulating membrane and on the left by a well-developed adoral zone of membranelles. A perizonal stripe of four longitudinal kineties lies along the right anterior margin parallel to the undulating membrane. The somatic kineties are longitudinal. There is a long tuft of caudal cilia. The central round macronucleus and the overlying micronucleus are seen in this image. Several food vacuoles and the posterior terminal contractile vacuole are seen here. From sapropelic sediments in freshwater aquaculture pond near Boise, Idaho. DIC optics.