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 Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade Discoba Simpson 2009
                       Superphylum Discicristata Cavalier-Smith, 1998 [coordinate rank]
                         Phylum Percolozoa Cavalier-Smith, 1992
                           Subphylum Tetramitiaᵀ Cavalier-Smith, 1993
                             Infraphylum Eutetramitia Hanousková, Táborský & Čepička, 2018
                               Class Heterolobosea Page & Blanton, 1985
                                 Order Acrasida Schröter, 1886 - acrasids
                                   Family Guttulinopsidae L. Olive, 1970
                                     Genus Rosculus R.S.J. Hawes, 1963 [monotypic]
                                       Rosculus ithacusᵀ R.S.J. Hawes, 1963