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 Trigonopyxidae Loeblich & Tappan, 1964
             1 Genus Trigonopyxis Penard, 1912
             2 Genus Cyclopyxis Deflandre, 1929
             3 Genus Cornuapyxis Coûteaux & Chardez, 1981
             4 Genus Geopyxella Bonnet & Thomas, 1955
             5 Genus Ellipsopyxis Bonnet, 1965
             6 Genus Ellipsopyxella Bonnet, 1975