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An order of ciliates (subclass Peritrichia, phylum Ciliophora) characterized by a cylindric shape with the cilia usually limited to the zone surrounding the mouth opening; includes the suborder Mobilina, the members of which are all ectoparasites or endoparasites of aquatic invertebrates and vertebrates, of which the genus Trichodina includes economically significant gill parasites of fish.
[peri- + G. thrix, hair]
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Steffan's (3) review of ectosymbiosis of aquatic insects includes reports of Peritrichida infestations of Ephemeroptera, Odonata, Hemiptera, Diptera, Trichoptera, and Coleoptera.