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 Rhabdophora [monotypic]
             Class Litostomatea Small & Lynn, 1981
               1 Genus Didinium Stein, 1859
               2 Genus Lacrymaria Bory, 1824
               3 Genus Entodinium Stein, 1859