Taxobox | color = khaki
name = Plagiopylids
domain = Eukaryota
regnum = Chromalveolata
superphylum = Alveolata
phylum = Ciliophora
classis = Plagiopylea
ordo = Plagiopylida
ordo_authority = Small & Lynn, 1985
subdivision_ranks = Typical families
subdivision =
The plagiopylids are a small order of ciliate protozoa, including a few forms common in anaerobic habitats.

The body cilia are dense, and arise from monokinetids with an entirely unique ultrastructure; one or two rows of dikinetids run into the oral cavity, which takes the form of a groove, with a deep tube lined by oral cilia leading to the mouth. The order was introduced by Small & Lynn in 1985, who treated it as a subclass of Oligohymenophorea. Since then they tend to be treated as an independent class, possibly affiliated with the Colpodea.

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