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 Postciliodesmatophora Gerassimova & Seravin, 1976 - desmates
           Class Heterotrichea Stein, 1859
             Order Heterotrichidaᵀ Stein, 1859 - heterotrichs
               Family Climacostomidae Repak, 1972
                 1 Genus Fabrea Henneguy, 1890
                 2 Genus Climacostomum Stein, 1859
                 3 Genus Copemetopus Villeneuve-Brachon, 1940