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Opalinida

The Columbia Encyclopedia, Sixth Edition
Opalinida , phylum of unicellular heterotrophic organisms of the kingdom Protista . The opalinids are all intestinal parasites of small vertebrates, such as frogs, toads, and fish. Opalinid cells are covered with either short, hairlike structures called cilia or with longer flagella. Each organism has at least two nuclei. Their evolutionary lineage is unknown. ... Read more
protozoan
The Columbia Encyclopedia, Sixth Edition ...generally divided into five protist phyla: Mastigophora (the flagellates), Sarcodina (the amebas), Ciliophora (the ciliates), Opalinida , and Sporozoa . Most are motile, and most ingest food, as do animals, rather than produce it themselves, as do plants. The... Read more

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