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 Sclerosporales see Order Peronosporales
             Family Verrucalvaceae
               Genus Pachymetra B.J. Croft & M.W. Dick (1989)
               Genus Sclerophthora Thirum., C.G. Shaw & Naras. (1953)
               Genus Verrucalvus P. Wong & M.W. Dick (1985)