[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Supergroup Chromalveolata Adl et al., 2005 - chromalveolates see Kingdom Chromista Caval.-Sm. (1981)
       Stramenopiles Patterson, 1990 - stramenopiles see Superphylum Heterokonta Caval.-Sm. (1986)
         Peronosporomycetes M.W. Dick (2001) see Class Peronosporea
           01 Genus Achyla nom. null. see Genus Achlya Nees (1823)
           02 Genus Leptomitus C.Agardh (1824)
           03 Genus Peronospora Corda (1837)
           04 Genus Pythiogeton Minden (1916)
           05 Genus Rhipidium Cornu (1871), nom. cons.
           06 Genus Saprolegnia Nees (1823)
           07 Genus Ciliomyces I. Foissner & W. Foissner (1986) see Genus Ciliatomyces I. Foissner & W. Foissner (1995)
           08 Genus Crypticola Humber, Frances & A.W. Sweeney (1989)
           09 Genus Ectrogella Zopf (1884)
           10 Genus Eurychasma Magnus (1905)
           11 Genus Haptoglossa Drechsler (1940)
           12 Genus Lagena Vanterp. & Ledingham (1930)
           13 Genus Lagenisma Drebes (1968)
           14 Genus Myzocytiopsis M.W. Dick (1997)
           15 Genus Olpidiopsis Cornu (1872)
           16 Genus Pontisma H.E. Petersen (1905)
           17 Genus Pythiella Couch (1935)
           18 Genus Rozellopsis Karling ex Cejp (1959)
           19 Genus Sirolpidium H.E. Petersen (1905)