The plagiopylids are a small order of ciliates, 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 Eugen Small and Denis 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.
- Xu, Yuan; Shao, Chen; Miao, Miao; Song, Weibo (January 2013). "Redescription of Parasonderia vestita () comb. nov. (Ciliophora, Plagiopylida), with notes on its phylogeny based on SSU rRNA gene". European Journal of Protistology. 49 (1): 106–113. doi:10.1016/j.ejop.2012.03.001. PMID 22771178.
- Modeo, Letizia; Fokin, Sergei; Boscaro, Vittorio (February 2013). "Morphology, ultrastructure, and molecular phylogeny of the ciliate Sonderia vorax with insights into the systematics of order Plagiopylida". BMC Microbiology. 13 (40): 40. doi:10.1186/1471-2180-13-40. PMC 3626617. PMID 23418998.
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