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
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Chromista Caval.-Sm. (1981) - chromists
                           Subkingdom Harosa Cavalier-Smith, 2010
                             Clade Sar Adl et al. 2012 [Simpson & Dunthorn 2020]
                               Infrakingdom Halvaria Cavalier-Smith, 2010
                                 Superphylum Alveolata Cavalier-Smith, 1991
                                   Phylum Miozoa Cavalier-Smith, 1987
                                     Subphylum Myzozoa Cavalier-Smith & Chao, 2004
                                       Infraphylum Apicomplexa Levine, 1970
                                         Superclass Sporozoa Leuckart, 1879
                                           Class Gregarinomorphea Grassé, 1953
                                             Subclass Orthogregarinia Cavalier-Smith, 2014
                                               Order Arthrogregarida Cavalier-Smith, 2014
                                                 Suborder Terragregarina Cavalier-Smith, 2014
                                                   Superfamily Actinocephaloidea Léger, 1892
                                                     Family Monocystidae Bütschli, 1882
                                                       Subfamily Monocystinaeᵀ Bütschli, 1882
                                                         Genus Monocystisᵀ Stein, 1848
                                                           Monocystis agilisᵀ von Stein, 1848
                                                           [Monocystis ascidiae Lankester, 1872] see Lankesteria ascidiae (Lankester, 1872) Mingazzini, 1891
                                                           Monocystis banyulensis
                                                           [Monocystis coronatus Hesse, 1904] see Stomatophora coronata (Hesse, 1904) Drzhevetskii, 1907
                                                           [Monocystis cuneiformis Ruschhaupt, 1885] see Rhynchocystis cuneiformis (Ruschhaupt, 1885) Levine, 1977
                                                           [Monocystis enchytraei (von Kölliker, 1848) Labbé, 1899] see Schaudinnella enchytraei (von Kölliker, 1848) Meier, 1956
                                                           [Monocystis gammari Georgévitch, 1951] see Heliospora longissima (von Siebold, in von Kölliker, 1848) Goodrich, 1949
                                                           [Monocystis lumbriciolidi Schmidt, 1854] see Apolocystis lumbriciolidi (Schmidt, 1854) Cognetti de Martiis, 1923
                                                           [Monocystis magna Schmidt, 1854] see Nematocystis magna (Schmidt, 1854) Hesse, 1909
                                                           [Monocystis minuta Ruschhaupt, 1885] see Rhynchocystis cuneiformis (Ruschhaupt, 1885) Levine, 1977
                                                           [Monocystis mitis Leidy, 1882] see Schaudinnella enchytraei (von Kölliker, 1848) Meier, 1956
                                                           [Monocystis nemertis (von Kölliker, 1845) Lankester, 1863] see Urospora nemertis (von Kölliker, 1845) Schneider, 1875
                                                           [Monocystis nereidis (Leidy, 1856) Lankester, 1863] see Lecudina pellucida (von Kölliker, 1848) Mingazzini, 1891
                                                           [Monocystis pachydrili Lankester, 1863] see Oligochaetocystis pachydrili (Lankester, 1863) Meier, 1956
                                                           [Monocystis pachydrili (Claparède, 1861) Labbé, 1899] see Oligochaetocystis pachydrili (Lankester, 1863) Meier, 1956
                                                           [Monocystis pellucida (von Kölliker, 1848) Lankester, 1863] see Lecudina pellucida (von Kölliker, 1848) Mingazzini, 1891
                                                           [Monocystis pilosa Cuénot, 1901] see Rhynchocystis cuneiformis (Ruschhaupt, 1885) Levine, 1977
                                                           Monocystis proteiformis
                                                           [Monocystis sagittata (Leuckart, 1861) Lankester, 1863] see Ancora sagittata (Leuckart, 1861) Labbé, 1899
                                                           [Monocystis spionis (von Kölliker, 1848) Lankester, 1863] see Polyrhabdina spionis (von Kölliker, 1848) Mingazzini, 1891
                                                           [Monocystis tenax (Dujardin, 1835) Labbé, 1899] see Monocystis agilis von Stein, 1848
                                                           Monocystis ventrosa Berlin, 1924