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 neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 Clade neozoa Cavalier-Smith 1993
                   Superkingdom Corticata Lankester, 1878
                     Kingdom Chromista Caval.-Sm. (1981) - chromists
                       Subkingdom Harosa Cavalier-Smith, 2010
                         Infrakingdom Halvaria Cavalier-Smith, 2010
                           Superphylum Heterokonta Caval.-Sm. (1981)
                             Phylum Oomycota Arx (1967)
                               1 Genus †Palaeachlya F.R.S. Duncan (1876), incertae sedis
                               2 Genus †Palaeophthora Singhai (1978), incertae sedis
                               3 Genus †Propythium M.K. Elias ex Janson. & L.V. Hills (1979), incertae sedis
                               4 Class Bigyromonadea Caval.-Sm. (1998) [monotypic]
                               5.1 Class Hyphochytrea Caval.-Sm. (1986)
                               5.2 Class Peronosporea