chromalveolates see Supergroup Chromalveolata Adl et al., 2005
   Kingdom Protozoa Goldfuss, 1818 - protozoa
     Infrakingdom Alveolata Cavalier-Smith, 1991 see [unranked] Alveolata Cavalier-Smith, 1991
       Phylum Ciliophora Doflein, 1901 - ciliates
         Subphylum Intramacronucleata Lynn, 1996 - amphiesmates
           Infraphylum Ventrata Cavalier-Smith, 2004
             Class Oligohymenophorea de Puytorac et al., 1974 - oligohymenophoreans
               1 Genus Tetrahymena Furgason, 1940
               2 Genus Paramecium Müller, 1773
               3 Genus Vorticella Linnaeus, 1767