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)
         Order Rozellopsidales M.W. Dick (2001), incertae sedis
           1 Family Pseudosphaeritaceae M.W. Dick (2001)
           2 Family Rozellopsidaceae M.W. Dick (2001)
           3 Genus Olpidiomorpha Scherff. (1926), incertae sedis
           4 Genus Pleotrachelus Zopf (1884), incertae sedis