organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     alveolates Cavalier-Smith see [unranked] Alveolata Cavalier-Smith, 1991
       Phylum Ciliophora Doflein, 1901 - ciliates
         Subphylum Intramacronucleata Lynn, 1996 - amphiesmates
           Class Spirotrichea Bütschli, 1889
             ?Order Armophorida Jankowski, 1964
               Family Metopidae Kahl, 1927
                 1 Genus Bothrostoma Stokes, 1888
                 2 Genus Palmarella Jankowski, 1975
                 3 Genus Tesnospira Jankowski, 1964
                 4 Genus Brachonella Jankowski, 1964
                 5 Genus Eometopus Small & Lynn, 1985
                 6 Genus Metopus Claparède & Lachmann, 1858
                 7 Genus Parametopus Grolière et al., 1980, nom. illeg. see Genus Parametopidium Aescht, 2001