organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     amoeboid protists
       Order Arcellinida Kent, 1880 - shelled lobosid amebas
         Suborder Difflugina R. Meisterfeld, 2000[2002] see Suborder Difflugiina R. Meisterfeld, 2002
           Family Difflugiidaeᵀ Wallich, 1864
             01 Genus Difflugia Leclerc, 1815
             02 Genus Protocucurbitella Gauthier-Lièvre & Thomas, 1960
             03 Genus Schwabia Jung, 1942
             04 Genus Pentagonia Gauthier-Lièvre & Thomas, 1958, nom. illeg.
             05 Genus Maghrebia Gauthier-Lièvre & Thomas, 1958
             06 Genus Zivkovicia Ogden, 1987
             07 Genus Lagenodifflugia Medioli & Scott, 1983
             08 Genus Pontigulasia Rhumbler, 1896
             09 Genus Cucurbitella Penard, 1902
             10 Genus Suiadifflugia Green, 1975
             11 Genus Sexangularia Awerintzew, 1906