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 Cyrtellaria] see Suborder Cyrtellarina
                       1 [Suborder Spyroidea] see Superfamily Spyroidea
                       2 [Suborder Botryoidea] see Superfamily Botryoidea
                       3 [Suborder Cyrtoideaᵀ Haeckel, 1862] see Superfamily Cyrtoidea Haeckel, 1862