Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 1990 [paraphyletic]
               Candidate superphylum Asgard Zaremba-Niedzwiedzka et al. 2017 [paraphyletic]
                 ["eukaryotes"] see Domain Eukaryota Chatton, 1925
                   [Class Polycystina Ehrenberg, 1838] see Class Polycystinea Ehrenberg, 1838
                     [Order Spumellarida] see Order Spumellaria Ehrenberg, 1875
                       Suborder Sphaerocollina
                         2 [Family Physematidae] see Family Thalassicollidae Haeckel, 1862
                         5 Family Bathysphaeridae
                         6 [Family Thalassophysidae [monotypic]] see Family Sphaerozoidae Haeckel, 1862
                         7 Family Sphaeroidae
                         9 Family Centrocollidae [monotypic]