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Description of Oligohymenophorea:
Intramacronucleate ciliates with oral apparatus, when present, distinct from somatic cilia, with a distinct right paroral dikinetid and typically three left oral polykinetids; oral structures in ventral oral cavity or deeper infundibulum, may extend onto and surround peristome; somatic cilia, monokinetids with anteriorly directed, distinct overlapping kinetodesmal fibrils, divergent postciliary ribbons, and radial transverse ribbons (except in Subclass Peniculia); posterior kinetosome of somatic dikinetids similar to a monokinetid unit while anterior kinetosome bears only a tangential transverse ribbon; often microphagous, some macrophagous carnivores, others histophagous.
Cellular life 
Intramacronucleate ciliates of uncertain status