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
           Order Saprolegniales
             Family Saprolegniaceae
               Genus Achlya Nees (1823)
               Genus Aplanes de Bary (1888)
               Genus Aplanopsis Höhnk (1952)
               Genus Archilegnia Apinis (1935), nom. conf.
               Genus Brevilegnia Coker & Couch (1927)
               Genus Calyptralegnia Coker (1927)
               Genus Couchia W.W. Martin (1981)
               Genus Dictyuchus Leitg. (1868)
               Genus Geolegnia Coker (1925)
               Genus Hamidia Chaudhuri (1942), nom. dub.
               Genus Hydatinophagus Valkanov (1931)
               Genus Isoachlya Kauffman (1921)
               Genus Jaraia Němec (1912), nom. dub.
               Genus Protoachlya Coker (1923)
               Genus Pythiopsis de Bary (1888)
               Genus Saprolegnia Nees (1823)
               Genus Scoliolegnia M.W. Dick (1969)
               Genus Sommerstorffia Arnaudov (1923)
               Genus Thraustotheca Humphrey (1893)