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 Lagenidiales see Order Pythiales
                 ?Family Olpidiopsidaceae
                   1 Genus Olpidiopsis Cornu (1872)
                   2 Genus Rozellopsis Karling ex Cejp (1959)
                   3 Genus Petersenia Sparrow (1934)
                   4 Genus Pseudosphaerita P.A. Dang. (1895)
                   5 ?Genus Pseudolpidium A.Fisch. (1892) see Genus Olpidiopsis Cornu (1872)