organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Chromista Caval.-Sm. (1981) - chromists
       Phylum Oomycota Arx (1967)
         Class Oomycetes G.Winter (1880) - oomycetes see Class Peronosporea
           01 Order Leptomitales Kanouse (1927)
           02 Order Myzocytiopsidales M.W. Dick (2001) see Order Peronosporales
           03 Order Olpidiopsidales
           04 Order Peronosporales
           05 Order Pythiales
           06 Order Rhipidiales
           07 Order Salilagenidiales M.W. Dick (2001)
           08 Order Saprolegniales
           09 Order Sclerosporales see Order Peronosporales
           10 Genus Dicksonomyces Thirum., P.N. Rao & M.A. Salam (1957), nom. conf., incertae sedis
           11 Order Anisolpidiales M.W. Dick (2001), incertae sedis
           12 Order Lagenismatales M.W. Dick (2001), incertae sedis