organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Protoctista Hogg, 1860
     Phylum Oomycota Arx (1967)
       Genus Aphanomyces de Bary (1860)
       1 Class Saprolegnia see Order Saprolegniales
       2 Class Leptomita see Order Leptomitales Kanouse (1927)
       3 Class Lagenidia see Order Lagenidiales
       4 Class Peronospora see Order Peronosporales