living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Thallobionta
         Division Eumycota see Kingdom Eumycota
           Subdivision Mastigomycotina
             Class Oomycetes G.Winter (1880) - oomycetes see Class Peronosporea
               Order Saprolegniales
                 1 Family Saprolegniaceae
                 2 ?Family Leptolegniellaceae M.W. Dick (1971)
                 3 ?Family Ectrogellaceae Cejp (1959)
                 4 ?Family Haliphthoraceae
                 5 ?Family Thraustochytriaceae Sparrow, 1943 ex Cejp (1959) see Family Thraustochytriidae Sparrow ex Cejp, 1959