Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               "protists" incertae sedis
                 Group †Calcitarcha G.J.M. Versteegh, T. Servais, Streng, Munnecke & Vachard (2009), incertae sedis [polyphyletic] - calcispheres
                   †"Pithonelloid taxa"
                     01 Genus †Bonetiella Trejo (1983)
                     02 Genus †Bonetocardiella T. Dufour (1968)
                     03 Genus †Burocratus Trejo (1983)
                     04 Genus †Lentodinella Kienel (1994)
                     05 Genus †Microconus Trejo (1983)
                     06 Genus †Navarrella Trejo (1993)
                     07 Genus †Pithonella T. Lorenz (1902)
                     08 Genus †Pleurozonaria Wetzel (1933)
                     09 Genus †Praecalcisphaerula Trejo (1983)
                     10 Genus †Risserella Trejo (1983)
                     11 Genus †Septiareata Kienel (1994)
                     12 Genus †Wallia Keupp (1990)
                     13 Genus †Zugelia Özdikmen (2009)